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Biol Psychiatry. 1986 Jul;21(8-9):787-98.

Neurophysiological studies of sensory gating in rats: effects of amphetamine, phencyclidine, and haloperidol.


Central mechanisms of sensory gating were assessed in Sprague-Dawley rats by an evoked potential technique similar to one that we have previously used to show diminished sensory gating in psychotic patients. Middle latency (15-50 msec) auditory evoked potential responses were recorded at the skull in unanesthetized freely moving animals. Gating mechanisms were assessed in a conditioning-testing paradigm by measuring the suppression of response to a 74 dB click test stimulus following an earlier identical conditioning stimulus at 0.5-sec intervals. The rats demonstrated significant suppression of the N50 response to the second auditory stimulus. Amphetamine treatment significantly interfered with the suppression of the response to the second stimulus; haloperidol, injected after the amphetamine, returned the conditioning-testing ratio toward normal values. Phencyclidine caused a similar decrease in suppression and was similarly antagonized by haloperidol. During some periods of hyperarousal, animals showed spontaneous loss of suppression; this condition could be reversed by haloperidol treatment. These results with psychotomimetic drugs in an animal model parallel abnormalities in sensory gating previously observed in psychotic human subjects.

[Indexed for MEDLINE]

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