RECOVERY FROM TEMPORARY THRESHOLD SHIFT IN MONKEYS EXPOSED TO IMPULSE NOISE: EVIDENCE FOR A DIPHASIC RECOVERY PROCESS.
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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In studying the recovery of rhesus monkeys from noise-induced temporary threshold shift, a consistent difference was noted between recovery from continuous, 112 dB tank noise and electrically-generated impulse noise of 160 to 170 dB peak-to-peak SPL. Although recovery from tank noise proceeded linearly as a function of the logarithm of recovery time in all ten monkeys studied, recovery from impulse noise was diphasic. There was a rapid, logarithmic recovery during the first 10 min, and, for some monkeys, a secondary shift which was maximum at 30 to 100 min post-exposure. Some evidence for identifying the secondary shift as an indicant of permanent damage is discussed. Author
- Anatomy and Physiology