TOPOGRAPHY OF CNV AND PINV IN SCHIZOTYPAL PERSONALITY

The topography of the postimperative negative variation (PINV) was ana lyzed in participants with high and low scores on the German version o f the Schizotypal Personality Questionnaire. Scalp amplitude and Lapla cian maps of the terminal contingent negative variation (tCNV) and PIN V and the time-course of the PINV were compared between the two groups . CNV and PINV were induced with a delayed matching-to-sample task, in which the pattern of the imperative stimulus was either clearly or am biguous matched to one of the two diamonds simultaneously presented as a warning stimulus 4.0 s earlier. Electroencephalograms were recorded with a DC amplifier (32 channels). Negativity increased from tCNV to PINV, especially at frontal sites, and the PINV was larger under ambig uous than under clear matching conditions. Low-scoring participants sh owed a right-sided predominance of the PINV. which was absent in high- scoring participants. These results resemble differences in the topogr aphy of the PINV between healthy control participants and those with s chizophrenia under identical experimental conditions and suggest funct ional differences between tCNV and PINV.