Cognitive Inhibition in Dissociative Identity Disorder (DID): Developing an Understanding of Working Memory Function in DID

The current study examined cognitive inhibition, a mechanism of working memory, in dissociative identity disorder (DID). A negative priming procedure was used to assess inhibitory functioning in DID patients, as well as in a general population sample and a psychiatric comparison sample. Results from the first study show a significant interaction between group and experimental condition; the general population sample showed an independently non-significant trend towards negative priming while the two psychiatric groups showed no evidence of negative priming. Using different stimuli and a new priming procedure, Study 2 essentially replicated the findings of Study 1 with the control sample displaying significant negative priming and the two psychiatric samples producing no negative priming. High dissociativity was significantly related to reduced negative priming in Study 2. Findings suggest a relationship between DID and weakened inhibitory functioning and are discussed with reference to the negative priming and dissociation literatures.