Accession Number : AD0764739

Title :   Middle-Ear Muscle Reflex to Aircraft Noise.

Descriptive Note : Progress rept. Apr 72-Mar 73,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s) : Sutherland,Harrell C. , Jr. ; Danford,Roy , Jr. ; Gasaway,Donald C.

Report Date : JUL 1973

Pagination or Media Count : 16

Abstract : Middle-ear muscle reflex threshold with three types of aircraft noise and with a 1000-Hz pure tone was sought with 21 rated flying personnel. Three subjects failed to respond to the noise at maximum intensity (108-dB SPL). Average reflex threshold in dB SPL for the other 18 subjects was 94.8 dB for the 1000-Hz tone, 95.2 dB for T-37B noise, 98.8 dB for UH-1P noise, and 94.4 dB for F-4E noise. Threshold for the UH-1P noise was significantly higher than thresholds for the other sounds. No other differences were significant. Threshold SPLs are well within the range of intensities commonly present in aircraft, which suggests that this reflex be considered in any study dealing with the effects of aircraft noise on occupants. (Author)

Descriptors :   (*EAR, AIRCRAFT NOISE), (*HEARING, AIRCRAFT NOISE), NOISE, MUSCLES, REFLEXES, INTENSITY, THRESHOLDS(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE