Autonomic responsivity to variable input rates among schizophrenics classified on the process-reactive dimension.

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Abstract
Schizophrenic groups rated low (reactive), intermediate, and high (process) on the Elgin Prognostic Scale and a group of normal subjects discriminated between matched and unmatched pairs of nonsense syllables under varying rates of input. Continuous PGR measures were recorded as subjects responded to the syllable pairs. Stimulus overload (defined as the extent to which subjects were unable to respond appropriately) was assessed and shown to be consistent across groups. The groups were differentiated as to PGR responsivity. Among the schizophrenic subjects the reactive group was the most responsive and the process subjects were least responsive to increases in rate of input.

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