Abstract
Gating of auditory sensory responsiveness was examined in 75 psychiatric inpatients using a conditioning-testing paradigm with the P50 wave of the auditory evoked response, in which pairs of stimuli are presented to the subject. In previous studies, most schizophrenics did not decrement the second response to the extent seen in normals. Acutely ill patients, who were representative of patients admitted to a public university teaching service and a proprietary hospital, were used to examine the extent to which diminished sensory gating is found in diagnoses other than schizophrenia. About half of these patients showed diminished sensory gating that correlated with measures of severity of illness. The data, taken together with that from other studies using this paradigm, suggest that diminished sensory gating, like several other psychophysiological abnormalities, is a trait deficit in schizophrenia, but a state deficit in many other mental illnesses.
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