E-ISSN : 2733-4538
This study investigated the recognition and implicit memory in nonclinical schizotypics with and without obsessive-compulsive symptoms using event-related potentials(ERPs). Based on the scores of the Schizotypal Personality Questionnaire and Maudsley Obsessive-Compulsive Inventory, schizotypal-trait(n=16), obsessive- schizotypal(n=16) and normal control(n=17) groups were selected. Continuous recognition task and categorization task were administrated in order to measure recognition and implicit memory, respectively. In terms of response time(RT) for the recognition memory task, control group showed faster RTs to old than new words, whereas both schizotypal-trait and obsessive-schizotypal groups showed longer RTs to old than new words. The error rates between old and new words did not differ among the three groups. For implicit memory task, the three groups did not differ in terms of RT or error rate. In terms of the ERP results in the recognition memory task, control group showed more positive potentials to old than new words, i.e., old/new effect, in 300-500ms and 500-700ms post-stimulus, whereas both schizotypal-trait and obsessive-schizotypal groups did not show the old/new effect in 500-700ms after stimulus-onset. In addition, the old/new effect in 300-500ms interval was significantly reduced in the obsessive- schizotypal group compared with the control and schizotypal-trait groups. For implicit memory task, no significant group difference was observed. These findings suggest that college students with schizotypal traits with/without obsessive-compulsive traits have impaired recognition memory, and those with obsessive traits seem to have more severe impairment of recognition memory than those without obsessive-compulsive traits.
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