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John R. Knott, PhD; Donald A. Irwin, PhD

Arch Gen Psychiatry. 1973;29(4):538-541.

Abstract
Two groups of 26 male college students, one scoring in the upper 10% and one scoring in the lower 10% of the Bendig test of emotionality (original sample, N = 200), were studied under a "low-stress" and a "high-stress" condition. Contingent negative variations (CNV) and galvanic skin responses (GSR) were recorded in a differential reaction time paradigm. Under low stress (flash-flash, response) both groups demonstrated equal CNV amplitudes. Under high stress (flash-intense electrical shock, response) the high emotionality group had smaller CNVs when response was made to intense shock than did the low emotionality group. Neither anticipatory GSRs nor reaction times differentiated the groups. The data are interpreted as suggesting a higher basal cortical negativity in the high emotionality group which prevented CNVs from reaching values beyond a physiologically determined maximum value.

Author Affiliations
Iowa City

From the Department of Psychiatry, Division of EEG and Neurophysiology, University of Iowa, Iowa City. Dr. Irwin is currently with the Department of Psychology, University of Southern Illinois, Carbondale.

Footnotes
Accepted for publication March 6, 1973.

Reprint requests to Division of EEG and Neurophysiology, Department of Psychiatry, University of Iowa, State Psychopathic Hospital, 500 Newton Rd, Iowa City, IA 52242 (Dr. Knott).

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