The effects of impulse noise on the auditory system.
Henderson D; Hamernik RP; Salvi RJ
NIOSH 1981 Jan; :1-14
A 9 year project to determine the effects of impulse noise on the auditory system is reviewed. The scope of the project includes: generation and systematic classification of impulse noise stimuli over a wide range of physical parameters; exposure of experimental animals to well specified impulses; measurement of the simultaneous effects on histology, electrophysiology, and behavior; and correlation of the stimulus parameters with electrophysiological, histological, and behavioral results. The synergistic interactions between noise and other auditory traumatic agents are noted. The relationship between symptoms of noise induced permanent threshold shift and the underlying pathophysiology by the creation of controlled hearing losses and sampling of nerve fiber responses is described. Progress in establishment of damage risk criteria is assessed. Experiments on impulse intensity and duration, frequency effects for temporary threshold shifts, effects of background noise on the status of hearing after impulse noise exposure, and effects of number of impulses and repetition rate are discussed. Mechanisms of hearing loss, physiology of noise induced hearing loss, morphological correlates of noise induced hearing loss, and auditory assessment procedures are examined.
NIOSH-Grant; Ear-disorders; Nerve-damage; Medical-monitoring; Physiological-measurements; Occupational-exposure; Employee-exposure; Safety-research
Final Grant Report
NTIS Accession No.
NIOSH, U.S. Department of Health, Education, and Welfare
Upstate Medical Center, Syracuse, New York