This research was supported by the Veterans Administration Medical Research Service and USPHS grants MH-38321, MH-44212, and MH-00728.
Effects of sound intensity on a midlatency evoked response to repeated auditory stimuli in schizophrenic and normal subjects
Version of Record online: 30 JAN 2007
Volume 32, Issue 5, pages 460–466, September 1995
How to Cite
GRIFFITH, J., HOFFER, L. D., ADLER, L. E., ZERBE, G. O. and FREEDMAN, R. (1995), Effects of sound intensity on a midlatency evoked response to repeated auditory stimuli in schizophrenic and normal subjects. Psychophysiology, 32: 460–466. doi: 10.1111/j.1469-8986.1995.tb02097.x
The present address of Jay Griffith is Psychiatry Service (117a), Veterans Administration Medical Center and University of Texas Health Sciences Center. Dallas, TX 75216.
- Issue online: 30 JAN 2007
- Version of Record online: 30 JAN 2007
- (Received July 5, 1994; Accepted December 12, 1994)
- Auditory event-related potentials;
- Auditory threshold;
Inhibitory gating of response to repeated stimuli is demonstrated by several event-related potentials, including the auditory P50 wave. The present study examined the effects of variation in sound intensity on this phenomenon in schizophrenics and normal subjects. Paired clicks, 500 ms apart, were presented 50 dB above threshold to 10 normal subjects and 10 schizophrenics. The normal subjects demonstrated significantly more decrement of response to the second stimulus than did the schizophrenics. When the sounds were noticeably louder(70 dB above threshold), no such difference was observed. Rather, both groups had similarly diminished gating of response. A significant difference between schizophrenics and normal subjects was also observed when the sounds were 30 dB above threshold, but the difference was smaller than that at 50 dB. At any stimulus intensity, concomitant eye movements led to loss of gating of P50 in the normal subjects.