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Behavioral and Electrophysiological Studies in Primates

James E. Pugh, Jr., MD; Milton R. Horwitz, MD; David J. Anderson, PhD

Arch Otolaryngol. 1974;100(1):36-40.

Abstract
In behavioral and chronic electrophysiological studies on monkeys exposed to octave band noise, cochlear microphonic and action-potential responses to puretone bursts were compared to behaviorally obtained thresholds from the same animals. The following results were obtained: (1) Behavioral pure-tone thresholds were within 3 dB of cochlear action-potential thresholds before noise exposure. However, during recovery from noise exposure, action-potential thresholds were as much as 10 dB lower, suggesting the possibility of physiological "masking." (2) Input-output functions for the cochlear action potentials during these recovery periods strongly resembled loudness recruitment functions, and maximum voltages obtained frequently exceeded preexposure values. Several reasonable explanations for post-exposure loudness recruitment exist, but the basis of the marked transient increase in cochlear electrical activity is still open to speculation. A circulatory rebound phenomenon may be involved.

Author Affiliations
Ann Arbor, Mich

From the Kresge Hearing Research Institute and the Department of Otorhinolaryngology, University of Michigan, Ann Arbor.

Footnotes
Accepted for publication Oct 10, 1973.

Reprint requests to Kresge Hearing Research Institute, Ann Arbor, MI 48104 (Dr. Pugh).

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