Dissociative Identity Disorder: Diagnostic Accuracy and DSM-5 Criteria Change Implications.

The Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) revised the diagnostic criteria for dissociative identity disorder (DID) to more accurately reflect the symptom profile of DID patients. No study has examined how this change affects clinical diagnosis of DID. The present study examined clinician reports of patient symptoms in relation to DSM-IV-TR and DSM-5 DID diagnostic criteria. Data were analyzed from 169 clinicians who participated in the Treatment of Patients with Dissociative Disorders Network Study with a patient they assigned a DID diagnosis. Clinicians evaluated their patients with respect to DSM-IV-TR and DSM-5 DID diagnostic criteria. Researchers determined a clinician-assigned DID diagnosis as "accurate" when the patient's reported dissociative symptoms matched DSM-IV-TR and/or DSM-5 criteria for DID. Most of the clinicians (95.27%) accurately diagnosed DID. Of those accurately diagnosed, 83.85% of patients met DSM-IV-TR and DSM-5 DID criteria, 9.94% only met DSM-IV-TR DID criteria, and 6.21% only met DSM-5 DID criteria. Further examination of responses suggested that possible idiomatic responses to the negative wording of the DSM-5 exclusionary criteria might have accounted for the DSM-IV-TR appearing to fit for a greater number of cases in this study. Changes in the DSM criteria for DID did not substantially change the frequency or accuracy of assigned DID diagnoses, but the removal of the requirement in DSM-5 that self-states regularly take control of an individual's behavior slightly increased the number of individuals meeting criteria for DID.

The economic burden of dissociative disorders: A qualitative systematic review of empirical studies.

OBJECTIVE: Dissociative disorders (DDs) are associated with intensive, long-term treatment, suicidality, recurrent hospitalizations, and high rates of disability. However, little is known about the specifics of the economic burden associated with DDs. This worldwide, systematic review examines the results of studies in adults on direct and indirect costs associated with DDs. METHOD: We searched 6 databases and the reference lists of articles. We also approached researchers to identify unpublished studies. No language restrictions were imposed. RESULTS: A total of 1,002 records met the search criteria, of which 29 papers were selected for full-text inspection. Ultimately, of these, we reviewed four empirical studies. We provide a narrative discussion of study findings. Our findings suggest that DDs are costly to society, and that there is a reduction in service utilization and associated costs over time with diagnosing of and specialized treatment for DDs. However, the overall quality of the economic evaluations was low; several types of DDs, comorbid conditions, and costs were not included; and men were underrepresented. Due to the heterogeneity among studies, we could not perform a meta-analysis. CONCLUSIONS: Due to the heterogeneity and low quality of the identified economic evaluations, no firm conclusions about the economic burden of DDs alone can be drawn. Higher quality research, including a detailed description of the study design, population, and primary outcome measures used, utilizing appropriate clinical alternatives and including major comorbidities, is urgently needed to more rigorously assess the economic impact of DDs. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

The Dissociative Subtype of PTSD Interview (DSP-I): Development and Psychometric Properties.

The inclusion of the dissociative subtype of post-traumatic stress disorder (PTSD-DS) in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) reflects the importance of assessing PTSD-DS. We developed the Dissociative Subtype of PTSD Interview (DSP-I). This clinician-administered instrument assesses the presence and severity of PTSD-DS (i.e., symptoms of depersonalization or derealization) and contains a supplementary checklist that enables assessment and differentiation of other trauma-related dissociative symptoms (i.e., blanking out, emotional numbing, alterations in sensory perception, amnesia, and identity confusion). The psychometric properties were tested in 131 treatment-seeking individuals with PTSD and histories of multiple trauma, 17.6 % of whom met criteria for PTSD-DS in accordance with the DSP-I. The checklist was tested in 275 treatment-seeking individuals. Results showed the DSP-I to have high internal consistency, good convergent validity with PTSD-DS items of the CAPS-5, and good divergent validity with scales of somatization, anxiety and depression. The depersonalization and derealization scales were highly associated. Moreover, the DSP-I accounted for an additional variance in PTSD severity scores of 8% over and above the CAPS-5 and number of traumatic experiences. The dissociative experiences of the checklist were more strongly associated with scales of overall distress, somatization, depression, and anxiety than scales of depersonalization and derealization. In conclusion, the DSP-I appears to be a clinically relevant and psychometrically sound instrument that is valuable for use in clinical and research settings.

An Online Educational Program for Individuals With Dissociative Disorders and Their Clinicians: 1-Year and 2-Year Follow-Up.

Individuals with dissociative disorders (DDs) are underrecognized, underserved, and often severely psychiatrically ill, characterized by marked dissociative and posttraumatic stress disorder (PTSD) symptoms with significant disability. Patients with DD have high rates of nonsuicidal self-injury (NSSI) and suicide attempts. Despite this, there is a dearth of training about DDs. We report the outcome of a web-based psychoeducational intervention for an international sample of 111 patients diagnosed with dissociative identity disorder (DID) or other complex DDs. The Treatment of Patients with Dissociative Disorders Network (TOP DD Network) program was designed to investigate whether, over the course of a web-based psychoeducational program, DD patients would exhibit improved functioning and decreased symptoms, including among patients typically excluded from treatment studies for safety reasons. Using video, written, and behavioral practice exercises, the TOP DD Network program provided therapists and patients with education about DDs as well as skills for improving emotion regulation, managing safety issues, and decreasing symptoms. Participation was associated with reductions in dissociation and PTSD symptoms, improved emotion regulation, and higher adaptive capacities, with overall sample |d|s = 0.44-0.90, as well as reduced NSSI. The improvements in NSSI among the most self-injurious patients were particularly striking. Although all patient groups showed significant improvements, individuals with higher levels of dissociation demonstrated greater and faster improvement compared to those lower in dissociation |d|s = 0.54-1.04 vs. |d|s  = 0.24-0.75, respectively. These findings support dissemination of DD treatment training and initiation of treatment studies with randomized controlled designs.

Spanish Abstracts by Asociación Chilena de Estrés Traumático (ACET) Un programa educativo online para personas con trastornos disociativos y sus médicos: Seguimiento de uno y dos años INTERVENCIÓN ONLINE PARA TRASTORNOS DISOCIATIVOS Las personas con trastornos disociativos (TDs) se encuentran sub-reconocidas, con pocos servicios y, a menudo, con enfermedades psiquiátricas graves, caracterizadas por marcados síntomas disociativos y de trastorno de estrés postraumático (TEPT) con discapacidad significativa. Los pacientes con TD tienen altas tasas de autolesión no suicida (ALNS) e intentos de suicidio. A pesar de esto, hay una escasez de entrenamiento sobre los TDs. Reportamos el resultado de una intervención psicoeducativa basado en la web para una muestra internacional de 111 pacientes diagnosticados con trastorno de identidad disociativa (TID) u otros TDs complejos. El programa de la Red de Tratamiento de Pacientes con Trastornos Disociativos (TOP DD Network, en su denominación en inglés) se diseñó para investigar si, en el transcurso de un programa psicoeducativo basado en la web, los pacientes con TD exhibirían un mejor funcionamiento y reducción de síntomas, incluso en los pacientes que generalmente han sido excluidos de los estudios de tratamiento por razones de seguridad. Mediante el uso de videos, ejercicios de escritura y prácticas conductuales, el programa TOP DD Network brindó a los terapeutas y los pacientes educación sobre los TDs y las habilidades para mejorar la regulación de las emociones, manejar los problemas de seguridad, y disminuir los síntomas. La participación se asoció con reducciones en los síntomas de disociación y de TEPT, mejor regulación de las emociones y mayores capacidades de adaptación, muestra total ds = .44-.90, así como reducción de ALNS. Las mejoras en ALNS entre los pacientes más auto-agresivos fueron particularmente sorprendentes. Aunque todos los grupos de pacientes mostraron mejoras significativas, los individuos con niveles más altos de disociación demostraron una mejoría mayor y más rápida en comparación con los más bajos en disociación |d|s = .54-1.04 vs. |d|s = .24-.75, respectivamente. Estos hallazgos apoyan la diseminación de la capacitación en el tratamiento del TD y el inicio de estudios de tratamiento con diseños controlados aleatorios.

Dissociation debates: everything you know is wrong.

Controversy about dissociation and the dissociative disorders (DD) has existed since the beginning of modern psychiatry and psychology. Even among professionals, beliefs about dissociation/DD often are not based on the scientific literature. Multiple lines of evidence support a powerful relationship between dissociation/DD and psychological trauma, especially cumulative and/or early life trauma. Skeptics counter that dissociation produces fantasies of trauma, and that DD are artefactual conditions produced by iatrogenesis and/or socio-cultural factors. Almost no research or clinical data support this view. DD are common in general and clinical populations and represent a major underserved population with a substantial risk for suicidal and self-destructive behavior. Prospective treatment outcome studies of severely ill DD patients show significant improvement in symptoms including suicidal/self-destructive behaviors, with reductions in treatment cost. A major public health effort is needed to raise awareness about dissociation/DD, including educational efforts in all mental health training programs and increased funding for research.

La controversia acerca de la disociación y de los trastornos disociativos (TD) ha existido desde el inicio de la psiquiatría y de la psicología modernas. Incluso entre los profesionales, las creencias sobre la disociación / TD a menudo no se basan en la literatura científica. Múltiples líneas de evidencia apoyan una relación poderosa entre disociación / TD y trauma psicológico, especialmente el trauma acumulativo y / o el que ocurre en la infancia. En oposición, los escépticos plantean que la disociación produce fantasías de trauma y que los TD constituyen condiciones artificiales producidas por la iatrogénesis y / o por factores socioculturales. Casi ninguna investigación o datos clínicos apoyan esta opinión. Los TD son comunes tanto en poblaciones generales como clínicas y representan un importante grupo desatendido que tiene un alto riesgo de comportamiento suicida y de conductas autodestructivas. Los estudios prospectivos de resultados del tratamiento de pacientes con TD grave muestran una mejoría significativa en los síntomas, incluídos los comportamientos suicidas / autodestructivos, con reducciones en el costo del tratamiento. Se requiere de un gran esfuerzo de salud pública para aumentar la conciencia acerca de la disociación / TD, incluyendo los esfuerzos educacionales en todos los programas de capacitación en salud mental y un mayor financiamiento para la investigación.

Les controverses au sujet de la dissociation et des troubles dissociatifs (TD) existent depuis les débuts de la psychologie et de la psychiatrie modernes. Même parmi les professionnels, les croyances au sujet de la dissociation et des TD sont rarement fondées sur la littérature scientifique. De nombreuses sources de données appuient la thèse d'une relation forte entre dissociation, TD et traumatisme psychologique, surtout quand celui-ci est cumulatif et/ou survenu dans l'enfance. Pour les sceptiques, la dissociation génère des traumatismes fictifs et les TD sont des maladies artificielles provoquées par des facteurs iatrogènes et/ou socioculturels. Pratiquement aucune donnée clinique ou de recherche ne vient conforter cette thèse. Les TD sont répandus dans la population générale et la population clinique, et touchent un nombre important de sujets sous-médicalisés pour lesquels le risque de suicide et de comportement auto-destructeur est élevé. Des études prospectives de résultats cliniques sur des patients sévèrement atteints de TD montrent une amélioration significative des symptômes, dont les comportements suicidaires et auto-destructeurs, avec une diminution des coûts de traitement. Un effort majeur de santé publique est nécessaire pour augmenter la vigilance sur la dissociation et les TD, y compris des efforts d'éducation dans tous les programmes de formation sur la santé mentale ainsi qu'une augmentation des fonds destinés à la recherche.

Six-year follow-up of the treatment of patients with dissociative disorders study.

Objective: Literature on the treatment of dissociative disorders (DDs) suggests that these individuals require long-term and specialized treatment to achieve stabilization and functionality. There is considerable empirical support for specialized phasic, dissociation-focused treatment in reducing a myriad of psychological symptoms and self-harm in this population. However, until recently, there has been a paucity of longitudinal treatment research on DD patients. Method: In the present six-year follow-up study, 61 therapists who participated in the initial phase of the Treatment of Patients with Dissociative Disorders (TOP DD) study answered questionnaires about their study patient's stressors, quality of life, global functioning, victimization, and safety. These results provided a view of patients' progress six years since the beginning of the TOP DD study. Results: Longitudinal analyses demonstrated patients had significantly fewer stressors (Χ2 (6) = 18.76, p < .01, canonical r = .48, N = 76), instances of sexual revictimization (X2(1) = 107.05, p < .001) and psychiatric hospitalizations (t(54) = 2.57, p < .05, Cohen's d = .43), as well as higher global functioning (Χ2 (2) = 59.27, p < .001, canonical r = .65, N = 111). Conclusions: These findings continue to support the initial results of the TOP DD study that, despite marked initial difficulties and functional impairment, DD patients benefit from specialized treatment.

Opposite brain emotion-regulation patterns in identity states of dissociative identity disorder: a PET study and neurobiological model.

Imaging studies in posttraumatic stress disorder (PTSD) have shown differing neural network patterns between hypo-aroused/dissociative and hyper-aroused subtypes. Since dissociative identity disorder (DID) involves different emotional states, this study tests whether DID fits aspects of the differing brain-activation patterns in PTSD. While brain activation was monitored using positron emission tomography, DID individuals (n=11) and matched DID-simulating healthy controls (n=16) underwent an autobiographic script-driven imagery paradigm in a hypo-aroused and a hyper-aroused identity state. Results were consistent with those previously found in the two PTSD subtypes for the rostral/dorsal anterior cingulate, the prefrontal cortex, and the amygdala and insula, respectively. Furthermore, the dissociative identity state uniquely activated the posterior association areas and the parahippocampal gyri, whereas the hyper-aroused identity state uniquely activated the caudate nucleus. Therefore, we proposed an extended PTSD-based neurobiological model for emotion modulation in DID: the hypo-aroused identity state activates the prefrontal cortex, cingulate, posterior association areas and parahippocampal gyri, thereby overmodulating emotion regulation; the hyper-aroused identity state activates the amygdala and insula as well as the dorsal striatum, thereby undermodulating emotion regulation. This confirms the notion that DID is related to PTSD as hypo-aroused and hyper-arousal states in DID and PTSD are similar.

Dispelling myths about dissociative identity disorder treatment: an empirically based approach.

OBJECTIVE: Some claim that treatment for dissociative identity disorder (DID) is harmful. Others maintain that the available data support the view that psychotherapy is helpful. METHOD: We review the empirical support for both arguments. RESULTS: Current evidence supports the conclusion that phasic treatment consistent with expert consensus guidelines is associated with improvements in a wide range of DID patients' symptoms and functioning, decreased rates of hospitalization, and reduced costs of treatment. Research indicates that poor outcome is associated with treatment that does not specifically involve direct engagement with DID self-states to repair identity fragmentation and to decrease dissociative amnesia. CONCLUSIONS: The evidence demonstrates that carefully staged trauma-focused psychotherapy for DID results in improvement, whereas dissociative symptoms persist when not specifically targeted in treatment. The claims that DID treatment is harmful are based on anecdotal cases, opinion pieces, reports of damage that are not substantiated in the scientific literature, misrepresentations of the data, and misunderstandings about DID treatment and the phenomenology of DID. Given the severe symptomatology and disability associated with DID, iatrogenic harm is far more likely to come from depriving DID patients of treatment that is consistent with expert consensus, treatment guidelines, and current research.

Reality versus fantasy: reply to Lynn et al. (2014).

We respond to Lynn et al.'s (2014) comments on our review (Dalenberg et al., 2012) demonstrating the superiority of the trauma model (TM) over the fantasy model (FM) in explaining the trauma-dissociation relationship. Lynn et al. conceded that our meta-analytic results support the TM hypothesis that trauma exposure is a causal risk factor for the development of dissociation. Although Lynn et al. suggested that our meta-analyses were selective, we respond that each omitted study failed to meet inclusion criteria; our meta-analyses thus reflect a balanced view of the predominant trauma-dissociation findings. In contrast, Lynn et al. were hypercritical of studies that supported the TM while ignoring methodological problems in studies presented as supportive of the FM. We clarify Lynn et al.'s misunderstandings of the TM and demonstrate consistent superiority in prediction of time course of dissociative symptoms, response to psychotherapy of dissociative patients, and pattern of relationships of trauma to dissociation. We defend our decision not to include studies using the Dissociative Experiences Scale-Comparison, a rarely used revision of the Dissociative Experiences Scale that shares less than 10% of the variance with the original scale. We highlight several areas of agreement: (a) Trauma plays a complex role in dissociation, involving indirect and direct paths; (b) dissociation-suggestibility relationships are small; and (c) controls and measurement issues should be addressed in future suggestibility and dissociation research. Considering the lack of evidence that dissociative individuals simply fantasize trauma, future researchers should examine more complex models of trauma and valid measures of dissociation.

Does phasic trauma treatment make patients with dissociative identity disorder treatment more dissociative?

Proponents of the iatrogenic model of the etiology of dissociative identity disorder (DID) have expressed concern that treatment focused on direct engagement and interaction with dissociated self-states harms DID patients. However, empirical data have shown that this type of DID treatment is beneficial. Analyzing data from the prospective Treatment of Patients With Dissociative Disorders (TOP DD) Study, we test empirically whether DID treatment is associated with clinically adverse manifestations of dissociated self-states: acting so differently that one feels like different people, hearing voices, and dissociative amnesia. We show that, over the course of the study, there were significant decreases in feeling like different people and hearing voices. These results indicate that this form of DID treatment does not lead to symptomatic worsening in these dimensions, as predicted by the iatrogenic model. Indeed, treatment provided by TOP DD therapists reduced, rather than increased, the extent to which patients experienced manifestations of pathological dissociation. Because severe symptomatology and impairment are associated with DID, iatrogenic harm may come from depriving DID patients of treatment that targets DID symptomatology.

Development and initial validation of the Structured Interview for Self-Destructive Behaviors.

This article describes the initial validation of the Structured Interview for Self-Destructive Behaviors (SI-SDB), a brief interview assessing suicidality, self-injury, substance abuse, disordered eating, and risky sexual behaviors. Self-destructive behaviors present clinical and practical challenges for mental health treatment providers. Participants were 217 psychiatric inpatients with a wide variety of diagnoses who completed the SI-SDB and other measures of psychiatric symptoms, trauma exposure, and other childhood experiences. Internal validity analyses revealed an internally consistent measure with 2 major factors. External validity analyses indicated that the Substance Abuse and Disordered Eating scales were predictive of related psychiatric diagnoses. All scales except Substance Abuse were significantly correlated with psychiatric symptoms and childhood abuse. These findings indicate that the SI-SDB is a valid means of assessing 5 significant domains of dangerous behaviors in clinical and research settings. Further research on the reliability of reports over time, interrater consistency, and convergent validity with longer measures of the SI-SDB domains is needed.

An exploration of young adults' progress in treatment for dissociative disorder.

Although treatment outcome research on dissociative disorders (DD) is increasing, an examination of treatment progress in young adults with these disorders remains noticeably absent from the literature. Many studies of DD patients report mean ages over 35. The present study examined the response to treatment of a subsample of young adults ages 18-30 with dissociative identity disorder and dissociative disorder not otherwise specified who participated in a naturalistic, longitudinal study of DD treatment outcome. Over 30 months, these patients demonstrated decreases in destructive behaviors and symptomatology as well as improved adaptive capacities. Compared to the older adult participants in the study, the young adults were more impaired initially. However, these younger patients improved at a rapid pace, such that their clinical presentations were similar to or more improved than those of the older adults at the 30-month follow-up. This brief report suggests not only that young adult DD patients can benefit from a trauma-focused, phasic treatment approach but that their treatment may progress at a faster pace than that of older adults with DD.

Evaluation of the evidence for the trauma and fantasy models of dissociation.

The relationship between a reported history of trauma and dissociative symptoms has been explained in 2 conflicting ways. Pathological dissociation has been conceptualized as a response to antecedent traumatic stress and/or severe psychological adversity. Others have proposed that dissociation makes individuals prone to fantasy, thereby engendering confabulated memories of trauma. We examine data related to a series of 8 contrasting predictions based on the trauma model and the fantasy model of dissociation. In keeping with the trauma model, the relationship between trauma and dissociation was consistent and moderate in strength, and remained significant when objective measures of trauma were used. Dissociation was temporally related to trauma and trauma treatment, and was predictive of trauma history when fantasy proneness was controlled. Dissociation was not reliably associated with suggestibility, nor was there evidence for the fantasy model prediction of greater inaccuracy of recovered memory. Instead, dissociation was positively related to a history of trauma memory recovery and negatively related to the more general measures of narrative cohesion. Research also supports the trauma theory of dissociation as a regulatory response to fear or other extreme emotion with measurable biological correlates. We conclude, on the basis of evidence related to these 8 predictions, that there is strong empirical support for the hypothesis that trauma causes dissociation, and that dissociation remains related to trauma history when fantasy proneness is controlled. We find little support for the hypothesis that the dissociation-trauma relationship is due to fantasy proneness or confabulated memories of trauma.

Where are we going? An update on assessment, treatment, and neurobiological research in dissociative disorders as we move toward the DSM-5.

This article provides an overview of the process of developing the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) of the American Psychiatric Association with a focus on issues related to the trauma-related disorders, particularly the dissociative disorders (DD). We also discuss the highlights of research within the past 5 years in the assessment, treatment, and neurobiological basis of trauma disorders. Recent research shows that DD are associated with severe symptoms as well as a higher rate of utilization of mental health treatment compared with other psychiatric disorders. As a result, DD, like other complex posttraumatic disorders, exact a high economic as well as personal burden for patients and society. The latest research indicates that DD patients show a suboptimal response to standard exposure-based treatments for posttraumatic stress disorder as well as high levels of attrition from treatment. An emerging body of research on DD treatment, primarily of naturalistic and open trials, indicates that patients who receive specialized treatment that addresses their trauma-based, dissociative symptoms show improved functioning and reduced symptoms. Recent studies of the underlying neurobiological basis for dissociation support a model of excessive limbic inhibition in DD that is consistent with the phenomenology and clinical presentation of these patients. We are optimistic that the forthcoming DSM-5 will stimulate research on dissociation and the DD and suggest areas for future studies.

Dissociative disorders in DSM-5.

BACKGROUND: We present recommendations for revision of the diagnostic criteria for the Dissociative Disorders (DDs) for DSM-5. The periodic revision of the DSM provides an opportunity to revisit the assumptions underlying specific diagnoses and the empirical support, or lack of it, for the defining diagnostic criteria. METHODS: This paper reviews clinical, phenomenological, epidemiological, cultural, and neurobiological data related to the DDs in order to generate an up-to-date, evidence-based set of DD diagnoses and diagnostic criteria for DSM-5. First, we review the definitions of dissociation and the differences between the definitions of dissociation and conceptualization of DDs in the DSM-IV-TR and the ICD-10, respectively. Also, we review more general conceptual issues in defining dissociation and dissociative disorders. Based on this review, we propose a revised definition of dissociation for DSM-5 and discuss the implications of this definition for understanding dissociative symptoms and disorders. RESULTS: We make the following recommendations for DSM-5: 1. Depersonalization Disorder (DPD) should include derealization symptoms as well. 2. Dissociative Fugue should become a subtype of Dissociative Amnesia (DA). 3. The diagnostic criteria for DID should be changed to emphasize the disruptive nature of the dissociation and amnesia for everyday as well as traumatic events. The experience of possession should be included in the definition of identity disruption. 4. Dissociative Trance Disorder should be included in the Unspecified Dissociative Disorder (UDD) category. CONCLUSIONS: There is a growing body of evidence linking the dissociative disorders to a trauma history, and to specific neural mechanisms.

Dissociative disorders in DSM-5.

BACKGROUND: We present recommendations for revision of the diagnostic criteria for the Dissociative Disorders (DDs) for DSM-5. The periodic revision of the DSM provides an opportunity to revisit the assumptions underlying specific diagnoses and the empirical support, or lack of it, for the defining diagnostic criteria. METHODS: This paper reviews clinical, phenomenological, epidemiological, cultural, and neurobiological data related to the DDs in order to generate an up-to-date, evidence-based set of DD diagnoses and diagnostic criteria for DSM-5. First, we review the definitions of dissociation and the differences between the definitions of dissociation and conceptualization of DDs in the DSM-IV-TR and the ICD-10, respectively. Also, we review more general conceptual issues in defining dissociation and dissociative disorders. Based on this review, we propose a revised definition of dissociation for DSM-5 and discuss the implications of this definition for understanding dissociative symptoms and disorders. RESULTS: We make the following recommendations for DSM-5: 1. Depersonalization Disorder (DPD) should derealization symptoms as well. 2. Dissociative Fugue should become a subtype of Dissociative Amnesia (DA). 3. The diagnostic criteria for DID should be changed to emphasize the disruptive nature of the dissociation and amnesia for everyday as well as traumatic events. The experience of possession should be included in the definition of identity disruption. 4. Should Dissociative Trance Disorder should be included in the Unspecified Dissociative Disorder (UDD) category. CONCLUSIONS: There is a growing body of evidence linking the dissociative disorders to a trauma history, and to specific neural mechanisms.