Abstract
The tonic skin conductance responses of schizophrenics, and normal were examined while they performed a two-flash discrimination task before, during and after the presentation of continuous white noise. Schizophrenics were subdivided into groups of responders and non-responders on teh basis of whether or not skin conductance orienting responses occurred to repeated tones. The electrodermal levels and tonic response amplitudes of the responders were higher than those of the control group. The non-responders had the lowest levels and their tonic resonses were mnimal. Correlations between the electrodermal variables and two-flash threshold, perceptual sensitivity, and response criterion or β, revealed variations in threshold and perceptual sensitivity with repeated testing in the control group but not the schizophrenic group. Correlations with β did not change. Results are related to previous divergent reports to the differential relations between two-flash threshold and electrodermal activity in schizophrenics adn controls and a neurophysiological explanation for these effects is proposed.
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