Accession Number : AD0712958

Title :   RECOVERY FROM TEMPORARY THRESHOLD SHIFT IN MONKEYS EXPOSED TO IMPULSE NOISE: EVIDENCE FOR A DIPHASIC RECOVERY PROCESS.

Descriptive Note : Progress rept.,

Corporate Author : ARMY MEDICAL RESEARCH LAB FORT KNOX KY

Personal Author(s) : Luz,George A.

Report Date : 16 MAR 1970

Pagination or Media Count : 15

Abstract : 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)

Descriptors :   (*AUDITORY PERCEPTION, THRESHOLDS(PHYSIOLOGY)), (*NOISE, TOLERANCES(PHYSIOLOGY)), LABORATORY ANIMALS, MONKEYS, RECOVERY, PULSES, TRANSFORMATIONS, DAMAGE

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE