ACOUSTIC REFLEX RESPONSE TO HIGH INTENSITIES OF IMPULSE NOISE AND TO NOISE AND CLICK STIMULI
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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Temporary threshold shifts TTS in 15 subjects were measured following exposure to 170 or 160 db sound pressure level SPL impulse noise under three conditions of acoustic reflex AR. In one the AR was not aroused prior to exposure in another the impulse noise was preceded by 150 msec by clicks at either 105 or 120 db sensation level SL in a third the impulse was preceded by noise at 105 or 120 db SL. The only significance in main variables was found between TTS with AR protection and TTS without AR protection. Some of the interactions involving subjects were significant but were considered of little import.
- Anatomy and Physiology