title: Objective assessment of peritraumatic dissociation: psychophysiological indicators.
abstract: OBJECTIVE
  The aims of this study were to investigate psychophysiological changes associated with peritraumatic dissociation in female victims of recent rape and to assess the relation between these changes and symptoms of posttraumatic stress disorder (PTSD).
  
  
  METHODS
  Eighty-five rape victims were examined in a laboratory setting within 2 weeks after the rape, and measures of heart rate, skin conductance, and nonspecific movement were collected. Self-report indexes of reactions to the trauma and interviews to assess PTSD symptoms and peritraumatic dissociation were also completed. On the basis of their scores on the Peritraumatic Dissociation Index, the subjects were classified as having low or high levels of dissociation.
  
  
  RESULTS
  Items from the index exhibited good internal consistency, and scores were approximately normally distributed. Individuals in the high peritraumatic dissociation group showed a significantly different pattern of physiological responses from those of the low dissociation group. In general, there was a suppression of autonomic physiological responses in the high dissociation group. This group also contained a larger proportion of subjects (94%) identified as meeting PTSD symptom criteria. Also, among the high dissociation subjects there was a discrepancy between self-reports of distress and objective physiological indicators of distress in the laboratory setting.
  
  
  CONCLUSIONS
  The results provide preliminary support for the idea that there is a dissociative subtype of persons with PTSD symptoms who exhibit diminished physiological reactivity. The results also underscore the importance of assessing dissociative symptoms in trauma survivors.
authors.affiliation: Department of Psychology, University of Missouri-St. Louis 63121, USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Griffin
authors.forename: P A
authors.initials: PA
authors.lastname: Resick
authors.forename: M B
authors.initials: MB
authors.lastname: Mechanic
mesh_terms: D000293:Adolescent; D000328:Adult; D004213:Dissociative Disorders / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology; D005260:Female; D005712:Galvanic Skin Response / Q000502:physiology; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008016:Life Change Events; D008875:Middle Aged; D010555:Personality Inventory; D011569:Psychiatric Status Rating Scales; D011902:Rape / Q000523:psychology*; D015203:Reproducibility of Results; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis / Q000503:physiopathology / Q000523:psychology*; D011795:Surveys and Questionnaires