The impact of event scale-revised: psychometric properties in a sample of motor vehicle accident survivors.

This study examined the factor structure, internal consistency, concurrent validity, and discriminative validity of the Impact of Event Scale-Revised (IES-R, [Weiss, D. S. & Marmar, C. R. (1997). The Impact of Event Scale-Revised. In: J. P. Wilson & T. M. Keane (Eds.). Assessing psychological trauma and PTSD (pp. 399-411). New York: Guilford Press]) in a sample of 182 individuals who had experienced a serious motor vehicle accident. Results supported the three-factor structure of the IES-R, Intrusion, Avoidance, and Hyperarousal, with adequate internal consistency noted for each subscale. Support was obtained for the concurrent and discriminative validity, as well as the absence of social desirability effects. Although some differences were noted between the IES-R Avoidance subscale and diagnostically based measures of this cluster of symptoms, these differences do not necessarily signify measurement problems with the IES-R. The IES-R seems to be a solid measure of post-trauma phenomena that can augment related assessment approaches in clinical and research settings.

Rebound effects following deliberate thought suppression: does PTSD make a difference?

This study was designed to examine the effects of deliberate suppression of trauma-related thoughts in 44 individuals who were PTSD+ and 26 individuals who were PTSD- following a motor vehicle accident (MVA). In an effort to resolve discrepancies in the literature, the PTSD- group was selected from the same help-seeking population as the patient group. Measures included the percentage of MVA-related thoughts, mood, perceived controllability of thoughts, and physiological arousal (heart rate, skin conductance, and two measures of facial EMG). Contrary to hypothesis, both PTSD+ and PTSD- groups showed a rebound in trauma-related thoughts following deliberate thought suppression. This rebound was associated with increases in negative affect, anxiety, and distress and diminished perceptions of controllability over thoughts. Examination of the physiological measures did not mirror the pattern noted for trauma-related thoughts, although the data suggest that suppression was associated with higher levels of frontalis EMG and possibly, reduced heart rate. The current study indicates that help-seeking individuals who are distressed about their psychological state following a serious MVA will show a rebound in MVA-related thoughts, irrespective of PTSD diagnosis. Implications for the study of thought suppression as a potential maintaining factor for trauma-related problems are discussed, with suggestions for future research.

Psychometric Properties of the Posttraumatic Cognitions Inventory (PTCI): a replication with motor vehicle accident survivors.

This study examined the factor structure, internal consistency, concurrent validity, discriminant validity, and discriminative validity of the Posttraumatic Cognitions Inventory (PTCI; E. B. Foa, A. Ehlers, D. M. Clark, D. F. Tolin, and S. M. Orsillo, 1999) in a sample of 112 individuals who had experienced a serious motor vehicle accident. Results generally supported the 3-factor structure of the PTCI: (a) Negative Cognitions About Self, (b) Negative Cognitions About the World, and (c) Self-Blame. Subscales reflecting negative thoughts of the self and world showed adequate internal consistency, as well as good concurrent, discriminant, and discriminative validity. However, difficulties with the subscale representing self-blame emerged, specifically poor concurrent and discriminant validity. Potential reasons for this finding are discussed. The PTCI seems to be a promising measure of negative and dysfunctional posttrauma cognitions, which deserves continuing attention.