CUMULATIVE EFFECTS OF REPEATED EXPOSURE TO HIGHINTENSITY TONES UPON RECOVERY OF AUDITORY SENSITIVITY,
Abstract
Twenty subjects with normal hearing were subjected to four series of twenty one-minute exposures of a 3000 cps tone. Each series of exposure tones was presented at one of four sound pressure levels: 85db, 90db, 95db, or 100db above 0.0002 microbar. The time required for threshold for a 4500 cps pulsed tone to recover to within 20db and 10db of pre-exposure level was measured after each one-minute exposure. The pattern of recovery times indicated that (a) there is a critical intensity (95db in the present conditions) below which adaptation is evoked and above which cumulative fatigue results from exposure, and (b) cumulative fatigue holds more promise than adaptation in the development of a noise-susceptibility test. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 04, 1963
- Accession Number
- AD0420856
Entities
People
- Vernon C. Bragg
Organizations
- Naval Aerospace Medical Institute