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Impaired Auditory Gating and P50 Nonsuppression Following Traumatic Brain Injury

Received January 11, 1999; revised May 6, 1999; accepted May 26, 1999. From the Department of Psychiatry and Neurology, University of Colorado Health Sciences Center, Denver; and the Research Service, Psychiatry Service, and Neurology Service, Denver Veterans Affairs Medical Center, Denver, Colorado. Address correspondence to Dr. Arciniegas, University of Colorado Health Sciences Center, Campus Box C268–28, 4200 East Ninth Avenue, Denver, CO 80262.

Traumatic brain injury (TBI) can produce persistent attention and memory impairment that may in part be produced by impaired auditory sensory gating. The P50 evoked waveform response to paired auditory stimuli appears to be a useful measure of auditory gating. The first controlled measurement of the P50 ratio in TBI patients is described: when 20 patients with persistently symptomatic TBI were compared with 20 control subjects, the P50 ratio was significantly greater in the TBI group. The potential neurophysiologic and therapeutic implications of this finding in TBI patients who report symptoms consistent with impaired auditory gating are discussed.

Key Words: Traumatic Brain Injury • Auditory Evoked Potentials • Acetylcholine • Hippocampus

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