SOME STUDIES OF TEMPORARY HEARING LOSSES RESULTING FROM REPEATED EXPOSURE TO GUNFIRE NOISE,
Abstract
Studies were conducted to determine the reliability of individual and group mean temporary threshold shifts and to determine the effect on reliability of varying the number of impulses and the peak sound pressure level (SPL) of the impulses. Two different exposure conditions were used: (1) 50 impulses with a peak SPL of 155 dB, and (2) 25 impulses with a peak SPL of 158 dB. The first two studies were conducted with subjects (Ss) having 'normal' hearing. To generalize the results of the noise program to as large a proportion of the Army population as possible the third repeated noise study was conducted using subnormal-hearing Ss exposed to one of the conditions previously studied with normal-hearing Ss, i.e., 50 impulses with a peak SPL of 155 dB. The purpose of the fourth study was to determine the reliability of TTS with particular reference to frequencies of 8000 cps and above. Ss with normal hearing were exposed to the noise condition used in the second study, i.e., 25 impulses at 158 dB SPL.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1966
- Accession Number
- AD0634690
Entities
People
- David C. Hodge
- R. Bruce Mccommons
Organizations
- Human Engineering Laboratory