Abstract
Contingent negative variation (CNV) amplitude, morphology, and duration have been studied in 370 subjects, distributed in 3 groups: controls (100 subjects), neurotics (135 subjects) and psychotics (135 subjects). Neurotics, especially those with hysterical characteristics, have a tendency to present small amplitude and Type A “field dependency” CNVs ( P > 0.05). Small amplitude or prolonged CNVs (Type III and Type IV curves with a “plateau” or “dome” aspect) occur significantly more often among psychotics than either normal or neurotic subjects ( P>0.001). It appears that psychotic patients seem able to respond only on the principle of “all or nothing” to the CNV paradigm.
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