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):

Report Date:

1970-03-16

Pagination or Media Count:

15.0

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

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE