Key result
Psychiatric patients exhibited statistically significant differences in Contingent Negative Variation compared to normal adults, with manic and depressed patients showing little resting/response discrimination.
Why the study?
Are there differences in Contingent Negative Variation (CNV) between acute, medication-free psychiatric patients and normal adults?
Case-Control (n=50)
Are there differences in Contingent Negative Variation (CNV) between acute, medication-free psychiatric patients and normal adults?
Psychiatric patients exhibiting acute symptoms show distinct and statistically significant differences in Contingent Negative Variation compared to normal adults.
CNV differences may indicate distinct psychophysiological patterns in acute psychiatric illness; leaves open diagnostic or prognostic utility pending prospective validation.
Slow potential responses of 14 schizophrenic, 12 manic, and 14 depressed patients were studied when they were exhibiting acute symptoms and were medication free. Ten normal adults served as a control group. Statistically significant differences were demonstrated between the patients and normals. In the latter, a typical CNV appeared with warning-imperative stimulus contingencies. There was very little discrimination between resting and response activity in manic and depressed patients. Waveforms in the schizophrenics were more variable with negative potential changes after motor response. No other clinical correlates with direct current potential characteristics were identified. Test retest profiles were generally stable in all subjects, with some exceptions associated with somatic treatment.
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Joyce Graham Small (1971) conducted a case-control in Psychiatric disorders (schizophrenia, mania, depression) (n=50). Psychiatric diagnosis (schizophrenia, mania, depression) vs. Normal adults was evaluated on Contingent Negative Variation (CNV) / slow potential responses. Psychiatric patients exhibited statistically significant differences in Contingent Negative Variation compared to normal adults, with manic and depressed patients showing little resting/response discrimination.
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