Loss of time-organized sympathetic skin responses in acute psychosis.

The aim of this study was to differentiate the response pattern characteristics of sympathetic skin responses (SSR) between unmedicated first psychotic subjects and healthy controls. We recorded SSR to novel auditory stimuli in 13 psychotic subjects and in 19 controls. There was no constant delay between a sudden change in the acoustic surroundings and SSR in psychotic subjects, whereas regularly this delay was 1.3 to 1.8 seconds in controls. The validity of the test was evaluated by blind rating responses to two categories. The lack of a regular time delay between a novel auditory stimulus and SSR suggests a timing disturbance in the neural networks regulating the autonomic nervous system responses in acute psychosis. Our finding and method may have future implications in evaluation of subtle autonomic nervous system alterations related, e.g., to drug effects.