________ is an experimental procedure in which schizophrenics who have undergone drug treatment respond with a smaller startle response than untreated schizophrenics to a sudden noise that is preceded by a warning signal.

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The procedure described is called prepulse inhibition (PPI). PPI is a measure of sensorimotor gating and is often impaired in individuals with schizophrenia. It involves presenting a low-intensity stimulus (prepulse) before a high-intensity stimulus (pulse), resulting in a reduced startle response to the pulse. This reduction in startle response is smaller in untreated schizophrenics compared to those who have undergone drug treatment.

________ Is an Experimental Procedure in Which Schizophrenics Who Have