Experimental approaches to cognitive abnormality in posttraumatic stress disorder
Section snippets
Involuntary retrieval of traumatic information
Reexperiencing symptoms are characterized by intrusion into consciousness of horrific autobiographical memories. If information about trauma is characterized by involuntary access to working memory, PTSD patients ought to exhibit delayed color-naming of trauma words in the emotional Stroop paradigm. Furthermore, the magnitude of delay (i.e., Stroop interference) should be related to other indices of intrusive cognition.
In this paradigm, the investigator asks participants to view words of
Explicit and implicit memory for traumatic material
Emotional Stroop studies indicate that trauma concepts are readily activated and difficult to suppress in people with PTSD. Other attempts to study enhanced accessibility of trauma-relevant information have involved explicit and implicit laboratory tests. Explicit memory tests require conscious recollection of previous experiences, whereas implicit memory tests reflect prior experiences without requiring conscious recollection of these experiences.
If trauma-related material is characterized by
Directed forgetting and childhood sexual abuse
Some therapists believe that sexually abused children acquire an avoidant (or dissociative) encoding style that enables them to disengage attention from terrifying stimuli during abuse episodes and to redirect it elsewhere (e.g., Gelinas 1983, Terr 1991). An ability to attend preferentially to innocuous cues (e.g., wallpaper patterns) may attenuate an otherwise very frightening experience (Herman & Schatzow, 1987). Although probably adaptive under the circumstances of chronic abuse, this
Autobiographical memory disturbance
While investigating mood and memory in depressed and suicidal patients, Williams and his colleagues discovered that these individuals had great difficulty recalling specific personal memories in response to cue words (e.g., Williams & Broadbent 1986, Williams & Dritschel 1988). Unlike nondepressed participants, these patients tended to retrieve “overgeneral” memories, especially in response to positive cue words. Thus, in response to words like happy, control participants easily remembered
Summary and clinical implications
Cognitive research on PTSD has captured information-processing abnormalities in the laboratory that may figure in the genesis of certain symptoms of the disorder. Words related to traumatic events disproportionately command attention in Stroop tasks. The meanings of such words, once activated, are difficult for PTSD patients to suppress. These studies imply that enhanced accessibility and failure of inhibition are candidates for the mechanism underlying the phenomenon of intrusive recollection.
Acknowledgements
Preparation of this article was supported, in part, by NIMH Grant 51927 awarded to the author.
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