Abstract
The contingent negative variation (CNV), first described by Walter in 1964, 1 is considered today as a cerebral phenomenon and not as an artifact from some extracerebral source. The CNV is recorded at vertex during the presentation of two successive stimuli, S 1-warning stimulus, S 2-imperative stimulus (classic CNV situation), preceding a motor response. The prolongation of the CNV after the motor response is called a postimperative negative variation (PINV). The PINV would appear more helpful in psychiatry than the CNV. 2 An abnormal PINV is more frequently observed in schizophrenic patients (75%) than in a normal control group (15%). 2 The present study was designed to investigate the possible influence of age, sex, and length of illness on the recording of the PINV in schizophrenic patients.
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