Theory of structural dissociation of the personality

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Dissociation of the Personality in Complex Trauma-Related Disorders
and EMDR: Theoretical Considerations
Article in Journal of EMDR Practice and Research · May 2010 DOI: 10.1891/1933-3196.4.2.76 · Source: OAI
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Dissociation of the Personality in Complex Trauma-Related Disorders and EMDR: Theoretical Considerations

Onno van der Hart
Department of Clinical and Health Psychology, Utrecht University, Utrecht, The Netherlands
Ellert R. S. Nijenhuis
Top Referent Trauma Center,
Mental Health Care Drenthe, Assen, The Netherlands
Roger Solomon
Buffalo Center for Trauma and Loss, Buffalo, New York


As eye movement desensitization and reprocessing (EMDR) has been increasingly applied in complex trauma-related disorders, including complex dissociative disorders, and trauma-related borderline per- sonality disorder, EMDR practice may benefit from theories developed to account for the dissociative nature of these disorders, such as the theory of structural dissociation of the personality (TSDP). TSDP postulates that the personality of traumatized individuals is unduly divided in two basic types of disso- ciative subsystems or parts. One type involves dissociative parts primarily mediated by daily life action systems or motivational systems. The other type involves dissociative parts, fixated in traumatic memo- ries, primarily mediated by the defense action system. The more severe and chronic the traumatization, the more dissociative parts can be expected to exist. This article presents the basics of TSDP, and a second article will provide guidelines for the treatment of complex trauma-related disorders based on this theory.
Keywords: dissociation; structural dissociation of the personality; dissociative disorders; EMDR (eye movement desensitization and reprocessing); integration; phase-oriented treatment
Eye movement desensitization and reprocessing (EMDR) is an effective and empirically sup- ported integrative psychotherapeutic approach for treatment of posttraumatic stress disorder (PTSD) and thus of traumatic memories (Bisson & Andrew, 2007; Foa, Keane, Friedman, & Cohen, 2009; Shapiro, 1995, 2001). Traumatic memories are sensorimotor, emotional experiences that relate to traumatizing events that survivors have not or not sufficiently inte- grated in their personality, that is, the dynamic biopsy- chosocial system that determines their characteristic mental and behavioral actions (cf., Allport, 1961; Van der Hart, Nijenhuis, & Steele, 2006).
EMDR is guided by the Adaptive Information Processing (AIP) model, which is highly applicable in the treatment of a wide range of disorders (Shapiro, 1995, 2001; Solomon & Shapiro, 2008). Initially steered by a Dissociative Disorders Task Force (Fine et al., 1995), EMDR is increasingly included in the treatment of complex trauma-related disorders. Such disorders include complex PTSD, trauma-related borderline personality disorder, dissociative identity disorder (DID), and dissociative disorder not otherwise speci- fied (DDNOS)-type 1 (clinical presentations similar to DID that fail to meet the full criteria for this disorder; American Psychiatric Association [APA], 1994, p. 490), that is, the most common form of dissociative dis- order encountered in clinical practice (e.g., Johnson, Cohen, Kasen, & Brook, 2006; S ̧ar, Akyüz, & Dog ̆an, 2007). EMDR can be used in these patient populations in advancing coping skills and integrating traumatic memories (e.g., Forgash & Knipe, 2007; Gelinas, 2003; Lazrove & Fine, 1996; Oppenheim, Ten Broeke, & De Jongh, 2008; Paulsen, 1995, 2007; Twombly, 2005; Young, 1994). However, clinical experience with such often chronically traumatized patients has taught therapists that modifications of the EMDR standard treatment protocol should be included when the goal
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 © 2010 EMDR International Association DOI: 10.1891/1933-3196.4.2.76
is to integrate their traumatic memories, or else these patients are at risk of decompensation (e.g., Forgash & Copeley, 2007; Gelinas, 2003).

Theories of psychopathology and psychotherapy are tools to guide clinical practice and research. They are, as any theory, intersubjective constructions of reality, built to serve particular purposes. Thus, the understanding and treatment of mental disorders such as DDNOS, DID, dissociative psychosis (Van der Hart & Witztum, 2008), as well as mixtures of these disorders and personality disorders, may benefit from a perspective that suggests a variety of clinical tools specifically designed for these populations. We pre- sent here the theory of structural dissociation of the personality (TSDP) and a related psychology of action (Nijenhuis, Van der Hart, & Steele, 2002; Steele, Van der Hart, & Nijenhuis, 2001, 2005, 2009; Van der Hart et al., 2006) as providing a comprehensive frame- work for understanding trauma, including complex traumatization as manifested in patients with the complex disorders mentioned above. The associated psychology of action describes and explains the mal- adaptive or otherwise inefficient actions trauma sur- vivors tend to engage in, and the more adaptive and efficient actions required to overcome the traumatic past.
In the EMDR literature, some brief excursions have been made to TSDP (Bergmann, 2007; Forgash & Knipe, 2007; Oppenheim et al., 2008), but a system- atic introduction of the theory has not been presented. In this article, we introduce TSDP and the related psychology of action for EMDR practitioners. TSDP’s basic tenet is that each traumatized individual is char- acterized by some degree of structural dissociation. It is a theory that accounts for the whole range of trau- matization and related degrees of dissociation of the personality. This implies, among other things, that not only the Diagnostic and Statistical Manual of Mental Disorders (4th ed.; APA, 1994) dissociative disorders but all trauma-related disorders, including posttrau- matic stress-disorder (PTSD) as the most simple one, are recognized as being dissociative in nature. TSDP, then, describes a continuum of complexity of disor- ders in terms of structural dissociation of the person- ality. Although this article aims at helping EMDR clinicians to understand the complex DSM-IV disso- ciative disorders and related complex trauma-related disorders, for didactic reasons we start explaining the theory at the most simple prototype on a dimension of complexity of dissociation. This prototype is called primary structural dissociation, which we consider as characterizing simple PTSD. More complex proto- types, that is, secondary and tertiary dissociation of
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 EMDR and Structural Dissociation
personality, are also introduced. In a second article, the focus will be on how the principles explained in the current part can help guide the practice of EMDR with patients with complex trauma-related disorders, that is, at the levels of secondary and tertiary struc- tural dissociation, to be explained below.
The Theory of Structural Dissociation of the Personality
Following exposure to a potentially traumatizing event, some individuals manage to integrate the experience in their personality. This integration preserves their mental health and includes different mental actions. As will be detailed later, they first synthesize the different components of the experi- ence. That is, they—largely unconsciously—bind sensations, visual and auditory perceptions, emo- tional feelings, thoughts, fantasies, and bodily move- ments to create a coherent experience. Second, they realize that the event happened to them, a mental action known as personification (Janet, 1929; Van der Hart et al., 2006). And third, they realize the event happened in the past, that their present is thus more real, and that their present is embedded in their past and anticipated future. Following Janet, this action can be referred to as presentification (Janet, 1928; Van der Hart et al., 2006). Taken together, personi- fication and presentification constitute the men- tal action of realization. Traumatized individuals, by definition, have not integrated their traumatic memories. They are characterized by some degree of nonrealization of their traumatization (Janet, 1919, 1935, 1945; Laub & Auerhahn, 1993; Van der Hart, Steele, Boon, & Brown, 2003; Van der Hart et al., 2006). They are, in Janet’s (1919) terms, unable to give these experiences their proper place in their “autobiography.” The more or less complete lack of synthesis, personification, and presentification con- stitute the essence of trauma, and are at the heart of all psychological, psychobiological, and psychosocial trauma-related symptoms. To mend their trauma, that is, their “injury,” traumatized individuals thus need to engage in these integrative actions that they were hitherto unable or were too scared to execute. In terms of TSDP, successful processing in EMDR involves the patient’s integrative actions of synthesis and realization, with its components of personifica- tion and presentification.
This lack of integration manifests in survivors in basically two ways: in symptoms of “too little” and in symptoms of “too much” (Janet, 1904). On the one hand, their traumatic experiences are “too little” real to them if at all. For example, they may be able to refer to them but in ways as if these experiences pertain to somebody else (lack of personification; see below); they may have limited awareness of their traumatization (low level of consciousness; retracted field of consciousness; partial dissociative amnesia; bodily anesthesia; analgesia; emotional numbing) and cannot bear to put the traumatic experiences and memories in words (phobia of traumatic memories, causing positive symptoms described below), or they may never refer to the traumatizing events because they have amnesia for them: complete nonrealiza- tion. Then, “for them, the event ... seems never to have occurred” (Janet, 1945, p. 184). In short, survi- vors may have incomplete or even no narrative mem- ories of their traumatization; and when they have such memories, the autobiographical nature of them is seriously compromised.

On the other hand, survivors may have flashbacks or dreams of the traumatizing events or reexperience these events as if they are taking place right here and now. Then they once again live in “trauma time.” Such experiences take place especially when they are confronted with conditioned stimuli (“triggers”): stimuli or events that, in their perception, signal that horrible events are about to happen again or that have a salient resemblance to significant components of the originally traumatizing events, and that there- fore tend to reactivate memories of these events. Flashbacks and re-enactments of traumatic experi- ences are called traumatic memories: hallucinatory, solitary, and involuntary experiences that consist of mental actions and the mental content these actions generate in the form of visual images, sensations, and sometimes also of physical acts which may occupy the entire perceptual field, and are terrifying to the individual (Janet, 1904, 1928; Van der Hart et al., 2006). In terms of his action psychology, Janet (1919) stated that:
[s]uch patients … are continuing the action, or rather the attempt at action, which began when the [traumatizing event] happened; and they exhaust themselves in these everlasting recom- mencements. (p. 663)
Janet meant that patients, when re-engaged in the mental and behavioral actions they were performing while being traumatized, are unable to bring such events to a closure, that is, to realize them; hence these “everlasting recommencements.” With trau- matic memories, survivors are insufficiently able to create a personal narrative of their traumatic expe- riences and share it verbally. When survivors are reenacting traumatic memories, they are more or less unable to engage in the action of recalling other past experiences or facts, and to perform the action of being aware of the present. Survivors then often seem unaware of much, if anything, about the present, as well as of nontraumatizing events in their lives.
Thus, trauma survivors seem to be character- ized basically by two insufficiently integrated sets of action tendencies. (We use the concept of action ten- dencies not only to indicate the propensity to act in certain ways but also to denote the complete cycle of action, including latency, readiness, initiation, execu- tion, and completion [Van der Hart et al., 2006].) One set involves recurrent reenactments of traumatic experiences, and another set pertains to functioning in daily life. Both sets of action tendencies are rooted in evolutionary prepared psychobiological action systems that guide mental and behavioral actions (Lang, 1995; Nijenhuis & Den Boer, 2009; Panksepp, 1998; Van der Hart et al., 2006). One major action system is defensive in nature and involves a variety of efforts to survive imminent threat to the integrity of the body and life (Fanselow & Lester, 1988). The mammalian defense action system is geared toward escape from and avoidance of physical and associated psychological threat, and includes subsystems such as flight, freeze, fight, and total submission (Porges, 2003). Other action systems are concerned with inter- ests and implied functions in daily life (Panksepp, 1998). These systems include energy regulation, attachment and care-taking, exploration, social en- gagement (Porges, 2003), play, and sexuality/repro- duction, and involve approaching attractive stimuli (Lang, 1995).
Each action system thus involves its own func- tions, values, and action tendencies. The functions and values that each action system involves guide this system’s specific bias toward its dominant clus- ters of perceptions, sensations, emotional feelings, cognitions, decisions, and behaviors. Thus, clusters of action tendencies will be very different when exploring the inner or outer world, being hungry, or being attacked.
According to TSDP, these different sets of action tendencies and the action systems from which they flow characterize two basic types of psychobiological subsystems of the personality. A distinctive feature of these subsystems is that each involves its own, at least rudimentary, first-person perspective (Nijenhuis, in press; Nijenhuis & Van der Hart, in press). That is, these subsystems of the personality construct phe- nomenal (i.e., subjective and conscious) models of who they are, what the world is like, and how they
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al. relate to the world. The first-person perspective thus results from ongoing integrative actions, that is, the recurrent actions of generating phenomenal models of self, world, and self as related to that world. What individuals or dissociative parts of an individual do not integrate in their first-person perspective will, by definition, not be part of their phenomenal models of self, world, and self-in-world, and will, as a conse- quence, be unavailable for the control of their actions. To be clear, there can be insufficiently integrated subsystems of personality as a whole system that lack consciousness and self-consciousness. However, including these subsystems in the domain of disso- ciation would create a category that is too wide to be clinically and scientifically useful (Nijenhuis, in press; Nijenhuis & Van der Hart, in press).

Dissociative Parts and Their First-Person Perspective
Following Janet, others have also contended that dis- sociative parts involve their own first-person perspec- tive. For instance, Mitchell (1922) stated that whatever is dissociated cannot exist as isolated mental mate- rial. That which is dissociated “forms an integral part of some [part of the] personality which may or may not be wider than that which manifests in waking life” (Mitchell, 1922, p. 113). Likewise, McDougall (1926) argued that this involves the “self-conscious purposive thinking of a [part of the] personality” (p. 544). These early views indicate that mental and behavioral actions involved in traumatic memories belong to some conscious and self-conscious disso- ciative part of the personality. Many other constructs are used to denote these dissociative subsystems of the personality, for example, ego states, dissociative or dissociated states, dissociated self-states, identity states, dissociative personality states, dissociative or dissociated selves, alter personalities or alters, and dissociative identities (see Van der Hart et al., 2006, for a discussion of these terms).
Auschwitz survivor Charlotte Delbo (as cited in Langer, 1991) illustrates the existence of two such dissociative parts of personality, each with its own, qualitatively different and partially overlapping, set of memories of Auschwitz, in the following testimony:
In a dream, the will is powerless. And in these dreams, there I see myself again, me, yes me, just as I know I was: scarcely able to stand … pierced with cold, filthy, gaunt, and the pain is so unbearable, so exactly the pain I suffered there, that I feel it again physically, I feel it
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 EMDR and Structural Dissociation
again through my whole body, which becomes a block of pain, and I feel death seizing me, I feel myself die.
Fortunately, in my anguish, I cry out. The cry awakens me, and I emerge from the night- mare, exhausted. It takes days for everything to return to normal, for memory to be “refilled,” and for the skin of memory to mend itself. I become myself again, the one you know, who can speak to you of Auschwitz without show- ing any sign of distress or emotion.
I have the feeling that the “self” who was in the camp isn’t me, isn’t the person who is here, opposite you. No, it’s too unbelievable. And everything that happened to this other “self,” the one from Auschwitz, doesn’t touch me now, me, doesn’t concern me, so distinct are deep memory and common memory. (Langer, 1991, pp. 5–7)
Emotional Parts and Apparently Normal Parts of the Personality
TSDP thus postulates that in trauma the patient’s personality, defined above as the dynamic biopsycho- social system as a whole that determines his or her characteristic mental and behavioral actions, is un- duly but not completely divided among two or more such dissociative subsystems or parts. These dissocia- tive parts are dysfunctionally stable (rigid) in their functions and actions, and too closed to each other, resulting in adaptive compromise. One prototypical personality subsystem is metaphorically called the Emotional Part of the Personality (EP; Myers, 1940; Van der Hart et al., 2006). As EP, the patient is fixated in sensorimotor and highly emotionally charged reen- actments of traumatic experiences. In other words, the patient as EP is strongly associated with traumatic memories. Primarily mediated by the mammalian action systems of defense and attachment cry, EP’s reenactments include action tendencies of defense against perceived or actual threat to the integrity of the body or to life itself, as well as action tenden- cies regarding the need for attachment and the fear of attachment loss (Liotti, 1999). That is, EP is basi- cally fixated in traumatic memories that frequently involve (particular combinations of) childhood emo- tional, physical, and sexual abuse, emotional neglect, and otherwise frightening and frightened parental or alloparental (i.e., from individuals who replace a child’s biological parents or significantly assist the biological parents in childrearing; Hrdy, 2009) care- taking and attachment.
The other prototype is called the Apparently Normal Part of the Personality (ANP; Myers, 1940; Van der Hart et al., 2006). As ANP, the survivor experiences EP and at least some of EP’s actions and contents as ego-dystonic and is fixated in avoidance of traumatic memories and often of inner experience in general. Mediated by action systems for functioning in daily life, ANP focuses on the functions of these systems and in this context commonly seeks the approval of caretakers to gain acceptance, protection, and love. To the degree that such attachment-related goals are realized at all, the painful result is that ANP’s appease- ment and apparent normality are reinforced, not the survivor’s authenticity. As ANP, the patient may be aware of having a mental disorder but attempts to appear “normal.” The fact that this normality is only apparent manifests in negative symptoms of detach- ment, numbing, and partial or, in rather exceptional cases, complete amnesia for the traumatic experi- ence. Apparent normality also shows in recurrent re-experiencing of traumatic memories from EP and other intrusions, such as ANP hearing EP’s voice, or EP hearing ANP’s voice.

Thus, when Charlotte Delbo as ANP lectured about her experiences in Auschwitz, she recalled too little of her traumatization. She did not sufficiently engage in two intimately related actions. One action that she as ANP lacked was realizing Auschwitz’s horrors (“it is too unbelievable”), and the other miss- ing action was including “the one from Auschwitz” in her autobiography. In other words, as ANP, she did not sufficiently integrate “Auschwitz” in her phenom- enal model of the world, and she did not integrate her Auschwitz existence in her phenomenal model of self. These missing actions left her as this part of her personality with an unduly restricted first-person perspective (Metzinger, 2003; Nijenhuis, in press).
As EP, Delbo’s first-person perspective was very different. As this part, she reexperienced Auschwitz at night. Her reexperiencing involved the actions of perceiving the camp and the camp life as a current reality, of sensing her dreadful physical condition at the time, of experiencing her fear, other aversive emotions, needs and interests, and of moving in ways that fit these perceptions, sensations, emotions, and cognitions. This particular integrated cluster of dif- ferent but intimately related actions involves her first-person perspective as EP and includes the linked perceptions, sensations, emotions, cognitions, and movements, but excludes pertinent other actions. Thus as EP she did not perceive, sense, feel, recall, and so on, her subsequent and present existence. That is, as EP, she did not integrate and realize her first-person perspective as ANP. This limitation left “the one from Auschwitz” fixated in a past reality as if it were the present. The implication of this analysis is that, if feasible, to overcome their undue fixations on the present and the past, each of the two dissocia- tive parts of the personality must (learn to) engage in particular new actions: ANP must integrate the traumatic past—EP’s first-person perspective—and EP must integrate the subsequent and current life— ANP’s first-person perspective.


Primary Structural Dissociation


The division of the personality into a single ANP and a single EP involves primary structural dissociation, and characterizes simple posttraumatic dissociative disorders, including PTSD. Dissociation between ANP and EP may serve adaptation to some degree when the capacity or necessary social support to inte- grate traumatic experiences and memories is lack- ing. However, this division of personality implies the emergence of negative dissociative symptoms such as depersonalization and, sometimes, a degree of dis- sociative amnesia and anesthesia, as well as positive dissociative symptoms such as recurrent intrusions of traumatic memories (although these intrusions may only start after a latency period).
As mentioned above, structural dissociation is not random, but likely develops along evolutionary prepared psychobiological action systems that guide mental and behavioral actions. EP is predominantly mediated by the mammalian defensive system in fixated action tendencies in the face of perceived or actual threat (Nijenhuis, 2004; Van der Hart et al., 2006). EPs tend to have a rigid and extreme narrowed attentional focus, primarily concentrated on per- ceived threat that is over-interpreted and thus over- reacted to in light of the traumatic past. EP develops a rudimentary (e.g., as seen in acute and simple PTSD) or more elaborated and autonomous phenom- enal model of self (e.g., as seen in Complex PTSD, DDNOS, and, particularly, DID). Each ANP and EP is also typically fixated in a particular insecure attach- ment pattern that involves either approach or defense in relationships (Steele, Van der Hart, & Nijenhuis, 2001). It is hypothesized that, in complex trauma-re- lated disorders, the resulting alternation or competi- tion between relational approach and defense among these parts is a substrate of what has been called a disorganized/disoriented attachment style (Liotti, 1999). The resolution of traumatic memories, by def- inition, involves (a degree of) resolution of this inse- cure attachment.
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al.

Secondary Structural Dissociation

When traumatizing events start earlier in life, are increasingly overwhelming, and/or prolonged or chronic, structural dissociation tends to be more complex. In secondary structural dissociation there is also a single ANP, but more than one EP. This divi- sion of EPs may be based on the failed integration among relatively discrete subsystems of the action system of defense, for example, fight, flight, freeze, collapse, also described as tonic immobility or total submission (Nijenhuis & Den Boer, 2009; Porges, Doussard-Roosevelt, & Maiti, 1994). These different subsystems seem to be related to different compo- nents of the central nervous system (Porges, 2007): Flight, freeze, and fight are foremost mediated by the sympathetic nervous system, and total submission by the dorsal vagal branch of the parasympathetic nervous system. We consider secondary structural dissociation to be mainly relegated to Complex PTSD, trauma-related BPD, and DDNOS-subtype 1.


Tertiary Structural Dissociation


Finally, tertiary dissociation involves not only more than one EP, but also more than one ANP. Division of ANP may occur as certain inescapable aspects of daily life become saliently associated with trauma- tizing events such that they tend to reactivate trau- matic memories. The patient’s personality becomes increasingly divided in an attempt to maintain func- tioning while avoiding traumatic memories, or has never included an integration of action systems for functioning in daily life as well as for defense. This division of ANP thus tends to occur along different action systems of daily life. For example, a little girl who is early in the morning sexually abused by her father, which is experienced by several EPs, subse- quently has to face the perpetrator at the breakfast table. When this confrontation reactivates these EPs, which subsequently intrude in the ANP, this ANP may be unable to eat and drink in her father’s presence. She may then develop another ANP who manages to resist intrusions by the EPs, and who can therefore eat and drink in her father’s company. Tertiary structural dissociation refers only to patients with DID. In a few DID patients who have an extremely low integrative capacity and in whom dissociation of the personality has become strongly habituated, new ANPs may also evolve to cope with the minor frustrations of life. Dissociation of the personality in these patients has become a lifestyle, and their prognosis is generally poor (cf., Horevitz & Loewenstein, 1994).
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 EMDR and Structural Dissociation
In secondary and tertiary structural dissociation, different (groups of) EPs may be related to different types of traumatization, while some of them may have been involved in more than one type, such as sexual abuse by the father and emotional and physical abuse by the mother. During a single traumatizing event more than one EP can simultaneously experience the same moment, but may contain different aspects of it. Take, for instance, Sally, a 32-year-old woman with secondary structural dissociation and a history of sexual abuse by her father. One of Sally’s EPs expe- rienced her father’s sexual abuse, but without hearing associated unpleasant noises, while a second EP expe- rienced the noises in the same moments of such trau- matizing events. We call this phenomenon parallel dissociation (Van der Hart et al., 1993, 2006). Different EPs may also experience successive episodes of a traumatizing event over time, as when the first two of Sally’s EPs experienced her father’s advances, but a third one experienced the next event that occurred, that is, the actual rape. We call this sequential dissoci- ation (Van der Hart et al., 1993, 2006). For instance, following the actions from a flight and a subsequent fight EP, eventually a submissive EP, characterized by hypo-arousal and anesthesia, may take over. Both parallel and sequential dissociation may involve path- ogenic kernels, that is, the subjectively most unbear- able aspects of traumatic experiences.
In short, the complex levels of structural dis- sociation stemming especially from chronic and varied early childhood traumatization, involve the formation of more complex traumatic memories, as recalled by different EPs, apart from the memories of the single or multiple ANPs. Each of these dis- sociative parts includes a set of action tendencies as basically mediated by particular action systems or constellations of action systems. These action ten- dencies include different ways of remembering the past, comprehending the present, and imagining the future. EPs typically reenact traumatic memo- ries, whereas ANPs (re)construct the past in differ- ent ways. Within and across traumatic memories more than one or even many EPs can be involved. Clinicians who fail to use instruments measuring dissociative phenomena and disorders and to take a detailed trauma history may be unaware that such complexities can exist. When, in these cases, EMDR is applied in a manner appropriate for simple PTSD (in terms of TSDP, symptoms relating to one, pos- sibly rudimentary EP and the traumatic memory associated with this part), a veritable Pandora’s box may be opened and therapeutic and adaptive disaster may ensue. For instance, working with a particular traumatic memory and a particular EP can reacti- vate other known or unknown EPs involved in this traumatic memory. These different EPs can start to respond to each other’s reactivated components of the traumatic memory and the associated emotions and sensorimotor reactions. This reactivity can rapidly lead to ANP being overwhelmed and, more gener- ally, to hyper-arousal or hypo-arousal of the per- sonality system as a whole. Or, worse, the target traumatic memory reactivates chains of the EPs’ other traumatic memories, involving a major crisis, including parts’ attempts at self-harm or suicide or rapid, uncontrollable switching among parts.

Maintenance of Structural Dissociation
Ongoing dissociation of the personality prevents the integration of traumatic memories, including the transformation of these aversive sensorimotor and highly emotional reenactments of traumatic expe- riences into narrative autobiographical memories, and the continued existence of different first-person perspectives. It is hypothesized that structural dis- sociation of the personality is predominantly main- tained by a series of phobias that characterize trauma survivors and by a lack of social support (Nijenhuis et al., 2002; Steele et al., 2001, 2005; Van der Hart et al., 2006). Janet (1904) described the core phobia as the phobia of traumatic memories, the essence of which seems to be an avoidance of full realization of the trauma and its effects on one’s life. As Holocaust sur- vivor and author Aharon Appelfeld (1994) testified: “The moment any [Holocaust] memory or a shred of a memory was about to float upwards, we would fight against it as though against evil spirits” (p. 18).
The division among the different dissociative parts is generally far from perfect. Unbidden, frightening intrusions are common, that is, positive dissocia- tive symptoms (Dell, 2009). In terms of TSDP, men- tal trauma-related contents and actions of EP (e.g., a brutal voice of an EP who imitates a perpetrator’s voice and words) may intrude ANP’s domain, that is, ANP becomes consciously aware of EP’s mental con- tents and behaviors. When this happens, ANP may become afraid of these memories and associated EPs. In this context, classical conditioning regarding these intrusions can occur, implying that cues that signal the likely occurrence of a (massive) intrusion from EP—such as “a shred of a memory”—may become a conditioned stimulus for ANP. ANP, then, may learn to mentally avoid such intrusions, with full deactiva- tion of ANP and switching to a different dissociative part as an extreme. In a similar manner, different EPs can become phobic of each other. For example, an EP who tends to freeze can become afraid of an EP who imitates a perpetrator. These EPs are not replicas (“introjects”) of the perpetrator but are commonly angry, fearful isolated parts that imitate the perpe- trator’s behaviors to achieve particular goals such as prevention of the perpetrator’s abuse and of depen- dency and false hope of acceptance and love that other parts may desperately seek. Therefore, these EPs are in TSDP described as perpetrator-imitating EPs rather than as “perpetrator introjects.” Different dissociative parts can also learn to dislike each other, due to evaluative conditioning (Van der Hart et al., 2006). Thus, an EP who imitates a perpetrator to have a sense of control may learn to dislike the “weakness” of a fearful EP. The fear, dislike, and avoidance that different dissociative parts tend to have regarding each other are common clinical observations. As dis- cussed above, some evidence suggests that ANP may manage to avoid threat cues at a preconscious level.
Increasing behavioral and mental avoidance involved in the maintenance of dissociation of the personality is needed to prevent what ANPs perceive as particularly unbearable realizations about self, oth- ers, and the world. Subsequently, ever-encompassing phobias seem to ensue from this fundamental phobia: phobia of attachment and attachment loss (in partic- ular with regard to the therapist; phobia of trauma- derived mental actions; phobia of dissociative parts; phobia of normal life; phobia of healthy risk-taking and change; and phobia of intimacy (emotional and sexual).
Phobias can be maintained by prereflective beliefs, that is, uncritically accepted verbal formulas based on feelings, prejudice, suggestion, and restricted view of self and others, such as: “I will go crazy if I start to feel”; or “The abuse did not happen to me”; “It was my fault”; “It was no big deal.” Phobias are also maintained by avoidant behavioral actions. For example, some patients use alcohol, drugs, or med- ication, lower their level of consciousness to avoid painful bodily and emotional trauma-related feelings or memories, and some hurt themselves to cover them up. These phobic mental and behavioral actions can be seen as substitute actions, that is, less adaptive actions that substitute for the more efficient but also (much) more difficult actions such as personification and presentification.
Substitute actions may develop in a variety of ways. When their stress levels are high and efficient emo- tion regulation skills underdeveloped, individuals as ANP or EP may tend to engage in developmentally more primitive kinds of actions. For example, unable
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al. to symbolize their experiences, they may tend to re- enact these experiences. And when reflective actions are beyond their reach, they will be inclined to en- gage in prereflective beliefs (i.e., prereflective sym- bolic action tendencies) such as “All men are bad” and “No one will ever love me, I am worthless,” or en- gage in impulsive (i.e., prereflective) behaviors such as drinking or self-mutilation. For instance, some EPs may engage in self-mutilation as a form of punish- ment of other EPs who manifest too much distress or may seek refuge in suicide attempts. Sometimes the patient cannot express himself or herself in words, and may even be unable to maintain a social relation- ship, as can happen during reenactments of traumatic experiences. These psychological features may relate to particular biological phenomena. For example, de- activation of the prefrontal cortex, a lack of activation of the hippocampus and parahippocampal gyrus, and a related overactivation of brain structures such as the amygdala, insula, and caudate marked EP when exposed to a personal trauma script, as discussed below (Reinders et al., 2003, 2006, 2008). While ANP (“host”) had more prefrontal activation than EP when listening to a trauma script, ANP in a restful state had less frontal activation than healthy controls (S ̧ar,Unal,&Öztürk,2007).Thisfindingsuggests that ANP may also have difficulties with actions that require major frontal activation, such as paying attention, orienting in time, planning, and engaging long-term memory.

In sum, different dissociative parts can fear, dis- like, and avoid each other in the context of intrusions. Less than perfect dissociation thus causes tendencies to maintain dissociation. Dissociative parts engage in substitute actions when the challenges exceed their integrative capacity. Gradually overcoming this com- plex of phobias and other ways of raising the survi- vor’s qualitative level of mental functioning or mental efficiency, that is, the capacity to use mental energy for adaptive, effective actions without loss or waste, and his or her level of mental and physical energy are essential to successful treatment, in particular the treatment of traumatic memories in Phase 2.
Dissociative Symptoms
Phenomenologically, the division of the personality in one or more ANPs and EPs manifests in dissociative symptoms. These psychobiological symptoms can be conveniently categorized as negative (functional losses such as aphonia and paralysis) or positive (intrusions such as flashbacks or voices), and as psychoform (symp- toms such as amnesia, hearing voices) or somatoform
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 EMDR and Structural Dissociation
(symptoms such as anesthesia, tics; Nijenhuis, 2004; Van der Hart et al., 2006). Negative symptoms pertain to actions that are missing and to actions that substi- tute for integration. For example, the patient may as ANP not engage in the action of recalling particu- lar events or having certain sensations, which may involve conscious and unconscious actions of mental and behavioral avoidance. This lack of engagement is manifested as dissociative amnesia and dissociative analgesia (insensitivity to pain) and anesthesia (loss of sensation), respectively. Positive symptoms pertain to actions that involve the generation of experiences that should not be generated anymore and the lack of integrative actions. For instance, as EP the patient may generate a flashback of traumatic experiences or par- ticular trauma-related sensations that should not be reenacted but rather symbolized in language. Actions that are dominant for one dissociative part are often absent for another dissociative part. Thus, EP may reenact a traumatic experience, whereas ANP does not recall or incompletely recalls this traumatic expe- rience. Upon intrusions, both parts fail to integrate the traumatic memory and to transform it in a symbolized form that is relegated to its proper place in the patient’s autobiography.
The general literature on dissociation usually emphasizes the negative dissociative symptoms that in- dicate more or less permanent functional losses in ANP(s), such as amnesia, depersonalization, anes- thesia, analgesia, and paralysis. However, as is the case with amnesia and re-enactments of traumatic experiences mentioned above, dissociative disorders including PTSD are also characterized by positive dissociative symptoms. These symptoms are typically acute, transient phenomena, often intrusions (i.e., ANP has awareness of EP’s influence) or dominance (i.e., executive control) of EPs including reenacted traumatic memories. Positive symptoms thus include particular observable or reported actions of one dis- sociative part that intrude on another dissociative part’s experiential domain. This means that negative and positive dissociative symptoms are often oppo- site sides of one coin: What one parts experiences too little, another part may experience too much. For ex- ample, one of the symptoms Marie, a young woman with DID, suffered from was a contracture of her right hand following a suicide attempt. As ANP, Marie ex- perienced anesthesia of her right pulse and hand. However, when the therapist invited the EP respon- sible for keeping the hand in this position, it became immediately clear that this part felt the physical pain involved in keeping the hand contracted. This was the part that had attempted suicide. The reason she kept the contracture was “because then something is already dead, and the physical pain is more bearable than the emotional pain of loneliness.”

Scientific Evidence for TSDP
Apart from consistent clinical evidence, there is emerging research showing that ANP’s and EP’s first-person perspectives regarding (reminders of) traumatic experiences involve specific psychological as well as biological features that cannot be explained as results of role-playing and suggestion (Hermans, Nijenhuis, Van Honk, Huntjens, & Van der Hart, 2006; Nijenhuis & Den Boer, 2008; Reinders et al., 2003, 2006, 2008). This research is inspired by TSDP’s contention that human experience and behavior can be analyzed at different but intrinsically related levels of analyses, that is, biological, psychological, and psy- chosocial levels, neither of which explains the oth- ers, at least not completely. In TSDP, it is emphasized that human (dys)functioning requires an analysis of individuals as a whole biopsychosocial system, that is embedded in a material, social, and cultural environment.
Against this background, Reinders et al. (2003, 2006) assessed sensorimotor, emotional, psycho- physiological, and neural reactions of women with DID as ANP and as EP to descriptions of neutral and traumatic memories. For ANP and EP, the neutral memory was autobiographical, but only EP recog- nized the traumatic memory as a personal memory. In our terms, ANP had not (yet) personified the trau- matic memory, and EP had not (yet) presentified it. It was documented that the patients as EP had strong sensorimotor and emotional reactions when they lis- tened to the trauma-script that was recorded in neu- tral tone of voice and that only included a description of the recollected event, and not descriptions of the patient’s reactions to the event. As EP but not as ANP, the patients saw visual images, heard sounds, had the feeling that they were touched, had pain, etc., and only as EP had they experienced fear, sadness, anger, disgust, and shame, and felt depressed in response to the trauma script but not the neutral script. Similarly, as EP but not as ANP, the patients had higher heart rate, systolic blood pressure, and lower heart rate variability when they listened to the trauma script. There were no psychophysiological differences between ANP and EP for the neutral script. Controlling for the possible influences of these sub- jective and physiological reactions, it was found that ANP and EP had very different patterns of neural activation when these different dissociative parts had listened to the trauma script, but not when they had listened to the neutral memory script. Generally speaking, ANP had more neocortical (prefrontal, frontal, parietal, occipital) activation. EP had more activation in insula, amygdala, caudate, and soma- tosensory cortex, going along with reduced activity of the prefrontal cortex, anterior cingulate, hippocam- pus, and parahippocampal gyrus. A conjunction anal- ysis demonstrated that ANP and EP were associated with completely different neural activation patterns. ANP’s neural activation pattern had features of the pattern found for patients with depersonalization dis- order, and EP’s neutral pattern shared many features of patients with PTSD who reexperience traumatiz- ing events. The collective subjective, psychophysi- ological, and neural findings of the Reinders et al. (2003, 2006) studies are fully consonant with TSDP (detailed in Nijenhuis & Den Boer, 2009).
To examine the possible influences of fantasy proneness, suggestion, and role-playing, high and low fantasy prone, mentally healthy women were instructed to simulate ANP and EP, and were invited to practice these two roles (Reinders et al., 2008). The women, all highly motivated to perform the tasks to their best ability, listened to a description of a neutral and painful autobiographical memory. As expected, the controls as EP reported more emotional reactions than the controls as ANP when they were listening to the painful memory. However, no differences were found for sensorimotor and psychophysiologi- cal reactions of these simulated dissociative parts. Comparisons between DID patients (ANP/EP) and controls (ANP/EP; high and low fantasy prone) regarding regional cerebral blood flow in response to the trauma script documented large and widespread differences for patients and controls while controlling for the influence of subjective and psychophysiologi- cal reactions. These findings demonstrate for the first time that healthy women instructed and motivated to simulate ANP and EP, whether high or low fantasy prone, were unable to generate the reactions of the authentic ANPs and EPs in women with DID. In a different study, it was found that ANP and EP also have different reactions to subliminally presented pictures of individuals with angry facial expressions, and that these reactions are different from ANP and EP-simulating controls (Hermans et al., 2006). According to Nijenhuis and Den Boer (2009), the evi- dence is consistent with TSDP’s hypothesis that ANP tend to mentally avoid threat cues, whereas EP is fix- ated on them.
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al. According to the TSDP, dissociation relates to a lack of integrative capacity. There are several lines of (additional) evidence for this contention. For exam- ple, it has been documented that the mental level of patients with serious dissociative symptoms is lower than the mental level of patients with few dissocia- tive symptoms (Haaland & Landrø, 2009), and that in a resting state “hosts” (i.e., ANPs) of DID patients have patterns of brain activity that are deviant from those of healthy control subjects (S ̧ar, Unal, & Öztürk, 2007). These findings are consistent with our hypoth- esis that ANP’s level of mental functioning is lower than this level in mentally healthy controls.

It has furthermore been established that the volume of the bilateral hippocampi and the bilat- eral parahippocampal gyrus—two brain structures related to the capacity for autobiographical mem- ories—are considerably smaller in patients with DDNOS, and even smaller in patients with DID, as compared with mentally healthy control subjects (Ehling, Nijenhuis, & Krikke, 2008; Vermetten, Schmahl, Lindner, Loewenstein, & Bremner, 2006). Controlled studies with PTSD patients have also documented a smaller hippocampal volume for these patients (for a review, see Karl et al., 2006). Comparing the hippocampal volume of mentally healthy subjects and patients with PTSD, DDNOS, and DID, thus patients with increasing levels of dissociation, an increasingly smaller volume is observed: PTSD (primary structural dissociation), approximately –10%; DDNOS (secondary struc- tural dissociation), approximately –15%; and DID (tertiary structural dissociation), approximately –20%. These findings are characterized by a remark- able relationship: the more severe the structural dissociation of the personality, the smaller the hip- pocampal volume. Furthermore, Ehling et al. (2008) found high correlations between the volume of these brain structures and psychoform and somatoform symptoms, as well as with the severity of the reported potentially traumatizing events. Correlations between the volume of these brain structures and the degree of general psychopathology and fantasy-proneness were lower or statistically nonsignificant.
Whereas it is currently unknown what factor or factors cause smaller hippocampal and parahippocam- pal gyrus volume in humans, exposure to experimental chronic restraint stress caused smaller hippocampal volume in rats (Lee, Jarome, Li, Kim, & Helmstetter, 2009). Consistent with a traumatogenetic explanation of smaller hippocampal volume, women with acute DID had smaller hippocampal volume than women
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who fully recovered from this severe mental disorder (Nijenhuis, Ehling, & Krikke, 2002). Furthermore, in a prospective single case study, Nijenhuis et al. (2002) found that full recovery from DID following psycho- therapy was associated with an increase of bilateral hippocampal volume of 19% (left) and 20% (right). This increase was upheld at a 1.5-year follow-up. This finding is consistent with an increase of bilateral hip- pocampal volume following successful treatment with EMDR in a male patient with chronic PTSD related to his mother’s suicide (Letizia, Andrea, & Paolo, 2007). However, in another study, successful psychotherapy of patients with PTSD, most of them survivors of sexual abuse or war, was not associated with an in- crease of the relatively small hippocampal volume in these patients (Lindauer et al., 2005).
TSDP includes the idea that there are links among the degree of exposure to adverse events, harmful effects on integrative brain structures in relation to the survivor’s developmental stage, the degree of dis- sociative symptoms, and the complexity of the struc- tural dissociation of the personality. Whereas the discussed volumetric studies did not involve direct tests of these hypotheses, the findings are certainly consistent with this idea.
A relation of lack of integrative capacity and dis- sociation is also revealed in peritraumatic reactions described as dissociative, impaired affect regula- tion, and persistent avoidance of traumatic memo- ries. Environmental factors include characteristics of present and prior adverse, potentially traumatizing events, caretaker dysfunction and unavailability, and lack of social support to integrate adverse experiences (e.g., Brewin, Andrews, & Valentine, 2000; Briere, Scott, & Weathers, 2005; Ogawa, Sroufe, Weinfield, Carlson, & Egeland, 1997; Ozer, Best, Lipsey, & Weiss, 2003; Van der Hart et al., 2006). For example, longi- tudinal findings suggest that dissociative symptoms are related to parental unavailability and exposure to traumatic stressors in early childhood (Diseth, 2006; Dutra, Bureau, Holmes, Lyubchik, & Lyons-Ruth, 2009; Lyons-Ruth, Dutra, Schuder, & Bianchi, 2006). A major task of (allo)parents is to assist the child in regulating emotional states, and early positive affec- tive communications relate to adaptive brain matu- ration and the child’s evolving capacity for empathy, attention, and coping with stressors (Schore, 2003a). As was detailed above, according to TSDP, dissocia- tion of the personality relates to a lack of integration of different action systems. The integration of these action systems would be strongly fostered by regu- lative affective parent–child communications. When these exchanges are lacking (as in emotional neglect), and/or replaced by disruptive emotional communi- cations (as in abuse), dissociation of the personality may result.

Integration: Synthesis and Realization
Trauma-related disorders are syndromes of nonreal- ization, as we stated above. They are integrative fail- ures, developed in the face of overwhelming threat. Especially when faced with reenacted traumatic memories or other sources of intense stress, survi- vors usually respond preflectively and do not resort to higher-order integrative, more efficient actions. The more severe the traumatization and the more complex the dissociation of the personality, the more survivors need to develop skills with regard to func- tioning in daily life before facing the most difficult challenge of integrating their traumatic memories, for example, using EMDR to promote the integra- tion of traumatic memories, and the further integra- tion of their personality. These skills can pertain to a wide variety of domains, such as emotion regulation, self-care, energy management, planning, and orga- nized execution as well as completion of daily life activities, social interaction, assertiveness, reflection, examination and change of prereflective beliefs, and communication and deliberation among different dissociative parts. Furthermore, clinicians must con- sider that regardless of the degree of structural dis- sociation, some trauma-survivors are endowed with a lower integrative capacity than others (cf., Boon, 1997; Horevitz & Loewenstein, 1994). These patients need (far) more preparation before attempts to inte- grate traumatic memories are undertaken (if ever), and tend to have a less favorable prognosis.
Integration and Mental Health
Integration is much more than the integration of trau- matic memories and includes the eventual “fusion” of dissociative parts of the individual into a more cohe- sive and coherent personality (e.g., Kluft, 1993). An integrated personality encompasses a single first-per- son perspective on self, others, and the world, as well as ongoing integrative mental and behavioral actions that support adaptive/efficient functioning in every- day life, including regulatory and reflective skills that are not based on habituated dysfunctional patterns. This is what mental health is about. As Janet (1889) stated, mental health is characterized by “a high capacity for integration, which unites a broad range of psychological phenomena within one personality” (p. 460). Integration of traumatic memories and dis- sociative parts fosters mental health.
Integration of Action Systems
Personality seems to be intimately related to action systems, and their integration is a developmental task (Nijenhuis & Den Boer, 2008, 2009; Van der Hart et al., 2006). The challenge to integrate different action systems in the personality as a whole system seems to increase to the degree with which the interests of the action systems diverge. Thus, integrating dif- ferent action systems for functioning in daily life is less complicated and challenging than integrating the action systems of defense and the action systems of daily life. The integration of the action systems for defense and for functioning in daily life is par- ticularly demanding when the action system of de- fense is strongly and recurrently activated because of chronic abuse, and when the survivor’s integra- tive capacity is limited. In short, in this context, the action systems for avoidance of aversive stimuli and approach of attractive stimuli may remain or be- come sequestered and organized within alternating and competing subsystems of the survivor’s person- ality, each with its own first-person perspective, that is, ANP and EP.
The implication of increased integration among different dissociative parts is that the involved parts will become influenced by more and more action systems, and will start to have at their disposal ever more action tendencies that formerly were only avail- able to one or some dissociative parts. In virtue of increased integration, the different parts also need to invest ever less energy and time in phobic actions, and waste ever less energy and time in recurrent intru- sions. Thus, the more they integrate, the better they are able to meet the ever-changing demands of daily life in flexible ways rather than in the often abrupt and stereotyped ways in which dissociative parts deal with these challenges. In a word, their mental and behavioral actions become more efficient.
Synthesis and Realization
As briefly introduced above, integration involves series and levels of mental and behavior actions to link or rather to bind, to use the technical construct, together experiences and phenomena that belong together, and to differentiate those that differ (Van der Hart et al., 2006). We distinguish two main lev- els of integration: Realization consists of higher-order integrative actions, which are based on lower-order integrative actions, called synthesis (Van der Hart et
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al. al., 2006). Synthesis pertains to those basic integrative mental and behavioral actions through which expe- riences, such as sensory perceptions, movements, thoughts, affects, memories, and a sense of self, are bound together (linked) and differentiated (distin- guished from each other). For example, when put into words, a synthesized traumatic experience might include: “My father is very angry (visual perception) at me because I (phenomenal self model, mostly lim- ited to the immediate situation) do not understand my homework (thought), he says I am stupid (auditory perception), I am sad and scared (emotional feelings), he beats me (visual perception, bodily sensations), and I try to ward him off to no avail (motor actions), it really hurts (bodily sensations), he puts a plastic bag over my head (visual, auditory and kinesthetic per- ceptions), I cannot breathe (bodily perceptions), and become really afraid (more emotional feelings), he wants to kill me (thought).

For clarity’s sake, it should be added that such traumatic experiences and the EPs that undergo them, by definition, are not or are insufficiently synthesized (integrated) with the rest of the personality. When survivors as EP reenact and thus reexperience a trau- matic memory, they are often unable to differentiate past and present. Thus, the survivor who believes that she experiences her father’s physical abuse may sometimes hardly be aware that she in fact reexperi- ences the traumatization: She lives in what we call trauma time. Synthesis in psychotherapy would per- tain to ANP synthesizing EP’s traumatic memory. When two or more different EPs are associated with different components of a particular traumatic expe- rience, and when ANP still lacks the capacity to syn- thesize the traumatic memory, it may be indicated to foster synthesis among the EPs first. This synthesis may reduce the emotionality of the involved EPs, for example, because they start to grasp the context of their limited experiences more. Due to this reduc- tion of EPs’ emotionality, it may be somewhat less demanding for ANP to synthesize the traumatic memory.
For example, Inge, an ANP of a 35-year-old patient with DID, was very afraid of experiencing and show- ing emotional feelings, including sadness. This avoid- ance was part of her phobia to realize her chronic traumatization. Some of her EPs, however, were very sad and felt an deep urge to cry. A male EP’s function was to act tough, and he despised “the weakness of these silly girls.” Once he and the therapist had devel- oped an understanding of his function (i.e., showing great courage in interaction with perpetrators), they developed a good working relationship. This male
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 EMDR and Structural Dissociation
EP then admitted that he also felt very afraid and sad because of particular traumatizing events in which he and “the girls” had been involved. With the thera- pist’s help, he learned that showing his tears was safe, and that “the girls” liked him more when he shared the tears with them. All involved EPs felt relieved after the joint crying. Inge as ANP had not been part of this experience, because “she was not in favor of crying.” However, she noticed that the involved EPs had calmed down. More of such sessions with EPs lessened their emotional load, increased their mental level, and reduced Inge’s phobia of them, so that her mental level also increased. Eventually, Inge learned to share sadness and other intense emotional feelings with the EPs, and learned to cry herself. It should be added that EMDR can be very helpful in enabling dissociative parts to overcome their phobia of each other (Forgash & Knipe, 2007).
Realization, involving higher levels of integration, is defined as developing a high degree of personal awareness of reality as it is, accepting it, and reflec- tively and creatively adapting to it. Ownership, that is, personal awareness and acceptance of experience as one’s own, is defined as personification (Janet, 1929; Van der Hart et al., 2006): “That happened to me and I am aware of how it helped shape who I am”; “These are my feelings and my actions.” Dissociative individ- uals do not sufficiently own or personify their inner and outer experiences, that is, they do not sufficiently integrate them in the context of one cohesive and coherent phenomenal self-model.
Full realization is achieved not just through per- sonal ownership, but also through presentification (Janet, 1928; Van der Hart et al., 2006), defined as being in the present with a synthesis of all one’s per- sonified experiences—past, present, and anticipated future—at the ready to support reflective decision making and adaptive action. Well-integrated indi- viduals remain grounded in the present when they remember traumatizing events, and experience the recall as an autobiographical narrative memory rather than a reliving of the past.
Fostering Integrative Action
Structural dissociation may be adaptive when the in- tegrative level is not sufficient to integrate traumatic experiences and evolved different dissociative parts of the personality. However, continued structural dissociation is maladaptive when integration of trau- matic experiences would be feasible. The integration of traumatic memories implies integrating divided subsystems of the personality, that is, ANPs and EPs. These subsystems involve different psychobiological features. For example, exposed to trauma-related events, EP has strong emotional reactions that can also be found at the level of neural activity. For ex- ample, EP has more insular and amygdalar activation than ANP in this context. The amygdala orchestrates a range of unconditioned and conditioned reactions to threat, including sympathetic and parasympa- thetic nervous system activity, analgesia, defensive motor reaction patterns, subjective emotional feel- ings such as fear, and retraction of the field of con- sciousness to threat cues in the immediate, subjective present. In neural terms, these reactions seem to lack modulation by the prefrontal and other integrative brain structures. However, when the psychobiolog- ical systems that involve daily life functioning—that is, ANP—are dominant, threat cues are avoided (gaze aversion, mental inhibition), and attention is directed to cues that have a bearing on daily life. The depersonalization and negative somatoform dissocia- tive symptoms that characterize ANP may be re- lated to disturbed metabolism in the somatosensory association areas.

Following these lines of analysis, neither disso- ciative subsystem can mend the integrative prob- lem. Rather, the integration of traumatic memories requires the joint, coordinated activation of EP and ANP. Cast in psychological terms, together, ANP and EP can integrate (synthesize, personify, and presen- tify) the traumatic past and the safe present. Together they can experience and realize what happened, that it happened in the past, that the past had its conse- quences, and that the present is safe and more real.
These difficult actions are supported by a solid therapeutic working alliance and, related to this, a firm grounding in the present. Part of emotion regulation is interpersonal regulation (Hrdy, 2009; Nijenhuis & Den Boer, 2009; Porges, 2007; Schore, 2003a, 2003b). In terms of Porges’ (2007) polyvagal theory, EPs seem to be mediated by the sympathetic nervous system (EPs engaging in flight, freeze, fight) or the dorsal vagal branch of the parasympathetic ner- vous system (EPs engaging in total submission [play- ing dead]) when exposed to trauma-related events (Nijenhuis & Den Boer, 2009). When ANPs feel rela- tively safe, they may be mediated more by the ven- tral branch of the parasympathetic nervous system, that allows for more interpersonal emotion regula- tion, including integration and coordination of dif- ferent action systems (Nijenhuis & Den Boer, 2009). However, when exposed to real or perceived threat cues such as EPs and traumatic memories associated with EPs, ANPs may become dominated more by the other components of the central nervous system, los- ing their regulatory capacity and reengaging in their conditioned mental avoidance. They thus may avoid EP, traumatic memories, and disconnect from social cues that would support integrative action tenden- cies, particularly contact with the therapist and the present more generally. Lack of interpersonal inte- grative support and loss of the present hampers or fully blocks the integration of EP-related traumatic memories. These deficiencies are, moreover, influ- enced by the phobias of attachment and attachment loss that are so common and strong in survivors of chronic childhood emotional neglect and maltreat- ment abuse, leaving ANPs as lone warriors fighting traumatic memories and the associated EPs as if they were “evil spirits.” ANPs are thus haunted by a dread- ful past that becomes far too real when it resurfaces, overshadowing their sense of safety in the present.
TSDP and the Practice of EMDR
TSDP suggests several facts and principles that clini- cians using EMDR must appreciate, some of which are briefly listed below for orientation. It is important to realize that:
• Successful EMDR requires sufficient integrative capacity, that is, sufficient mental and physical energy and mental efficiency. When the patient’s integrative capacity is too low, the clinician must assist the patient in gaining energy and efficiency before it is attempted to integrate traumatic mem- ories. Premature exposure to traumatic memories with EMDR (and any other intervention involving exposure to these memories) is ineffective at best and causes severe decompensation of the patient at worst.
• Patients with complex trauma-related disorders tend to encompass two or more different parts of their personality, each with their specific reactions to trauma-related stimuli. Clinicians must examine to what degree the patient’s personality is divided, and need to be aware that some parts may be man- ifest (i.e., activated) or others latent. These latent parts tend to become reactivated under particular circumstances, notably exposure to trauma-related stimuli such as during EMDR sessions.
• As ANP patients may show an apparently adaptive reaction to EMDR interventions, but respond as one or more EPs, with intense fear, anger, shame, despair, or still other vehement emotions during or briefly after the session. These emotions may involve or relate to substitute actions such as panic, self-mutilation, substance abuse, and feelings of
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al. intense anger. These substitute actions can be (re)elicited by the application of the EMDR standard protocol, that is, without any modifications for use with patients with complex trauma-related disorders.

• Some dissociative parts may be motivated to in- tegrate traumatic memories, whereas other parts may resist the actions involved. Sooner or later all dissociative parts need to be willing and able to en- gage in EMDR as a therapeutic intervention. The clinician must be active in fostering such motiva- tion and the actions needed for the integration of traumatic memories (e.g., affect regulation skills and other higher-level action tendencies).
• Some patients create new dissociative parts to cope with EMDR sessions. This creation may be due to premature efforts to integrate traumatic memories, or to the patient’s felt need to mentally avoid these memories or current inability to inte- grate these memories.
• Conflicts among different parts need to be resolved, so that these parts can collaborate in EMDR sessions, rather than interfere with each other’s actions.
• Building collaboration among different dissocia- tive parts and cooperation between these parts and the therapist may involve laborious and lengthy work. Setting up collaboration is greatly supported by the clinician’s understanding of the different types of dissociative parts that can exist and of their different, often conflicting first-person perspectives, goals, and functions, as well as their phobias of particular actions. The clinician’s un- derstanding of the action systems that mediate the different parts is particularly helpful in fostering cooperation with these parts and in promoting the positive attachment that is often so mandatory for therapeutic success. While some of this work can be supported by EMDR, other interventions will commonly be needed in the treatment of complex trauma-related disorders.
• Integration of traumatic memories requires the involvement and collaboration among different dissociative parts. This involvement and this col- laboration must often be fostered. Commonly phobias of trauma-derived mental and behavioral actions, of dissociative parts, and of trusting and attaching to the therapist within limits must be overcome before the phobia of traumatic memo- ries can be addressed.
• The integrative capacity of the different parts and the patient as a whole system can be raised by sharing resources (e.g., efficient mental and physi- cal actions/skills or even action systems) among different dissociative parts. EMDR may be used
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 EMDR and Structural Dissociation
to foster such sharing (Forgash & Copeley, 2007;
Korn & Leeds, 2002).
• The integration of traumatic memories can only
be reached through gradual synthesis and reali- zation in complex cases, given limited integrative capacity and severity and chronicity of the trau- matization. This implies that the clinician may need to assist patients in using their dissociative capacity to delimit the degree of synthesis and realization; for example, using imagery that only a portion of the to be integrated traumatic memory is synthesized and realized in a particular session.
• This gradual synthesis and realization also demands careful attention and agreement between patient and therapist as to which EPs will share their (aspect or dimension of a) traumatic memory, which other parts will be involved in the integration, and which other parts need to be excluded for the time being and have to remain in their own inner safe places.
In a second article, it will be detailed how TSDP can guide the application of EMDR as an intervention in the treatment of complex dissociative disorders that commonly includes a host of other interventions.
Discussion and Conclusion
This article presents a synopsis of the TSDP, together with the related psychology of action, and provides a nonexhaustive set of findings from research studies that support the theory. A more detailed discussion of the theory can be found in Van der Hart et al. (2006). This theory may help EMDR therapists to understand the complex inner world of survivors of chronic trau- matization, as manifested in complex trauma-related disorders, including complex dissociative disorders. As such, the theory may constitute a map for the rational application of phase-oriented treatment of these survi- vors, indicating what the successive problems are that need to be resolved, including the major challenge of the integration of traumatic memories. Thus, the theory may also provide an integrative framework for understanding other existing therapeutic approaches focused on the resolution of complex traumatization with which EMDR can be integrated, such as Ego State Therapy (cf., Forgash & Copeley, 2007; Phillips & Frederick, 1995) and traditional approaches geared at the treatment of DID (e.g., Kluft & Fine, 1993; Putnam, 1989; Ross, 1997). It should be noted that TSDP is an open theory, that is, in continuous development and incorporating new insights and research findings.
This article is not the place for a comparison between TSDP and EMDR’s main explanatory model, that is, the AIP model. Therefore, one observation needs to suffice: According to TSDP and the associ- ated psychology of action, “information processing” involves particular mental actions; thus, “processing traumatic memories” pertains to the mental actions of synthesis as well as realization (i.e., personification and presentification); these actions will have a neuro- biological and psychological description neither of which explains the other. They rather involve differ- ent levels of description of the same phenomena.

Another article will detail the goals for each treat- ment phase, many of them formulated in terms of overcoming specific phobias that are posited to have maintained the dissociation of the personality and, in- herently, the continuous existence of traumatic mem- ories. Using an extensive case example, some of the treatment techniques for each treatment phase will also be described. This article has not explained why EMDR works in terms of TSDP and its related psy- chology of action. However, we have described which mental actions are involved in successful EMDR treat- ment aiming at the integration of traumatic memo- ries as well as the unification of dissociative parts.
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Correspondence regarding this article should be directed to Onno van der Hart, Sinai Center for Mental Health, Laan van de Helende Meesters 2, 1186 AM Amstelveen, The Netherlands. E-mail: o.vanderhart@uu.nl
Journal of EMDR Practice and Research, Volume 4, Number 2, 2010 van der Hart et al.