Cumulative Effects of Repeated Exposure to High-Intensity Tones Upon Recovery of Auditory Sensitivity Twenty subjects with normal hearing were subjected to four series of twenty one-minute exposures of a 3 000 cps tone. Each series of exposure tones was presented at one of four sound pressure levels: 85 dB, 90 dB, 95 dB, or 100 dB above 0.0002 microbar. The time required for ... Research Article
Research Article  |   June 01, 1964
Cumulative Effects of Repeated Exposure to High-Intensity Tones Upon Recovery of Auditory Sensitivity
 
Author Affiliations & Notes
  • Vernon C. Bragg, Ph.D.
    U. S. Naval Medical Center, Pensacola, Florida
Article Information
Research Articles
Research Article   |   June 01, 1964
Cumulative Effects of Repeated Exposure to High-Intensity Tones Upon Recovery of Auditory Sensitivity
Journal of Speech, Language, and Hearing Research, June 1964, Vol. 7, 165-173. doi:10.1044/jshr.0702.165
History: Received September 23, 1963
 
Journal of Speech, Language, and Hearing Research, June 1964, Vol. 7, 165-173. doi:10.1044/jshr.0702.165
History: Received September 23, 1963

Twenty subjects with normal hearing were subjected to four series of twenty one-minute exposures of a 3 000 cps tone. Each series of exposure tones was presented at one of four sound pressure levels: 85 dB, 90 dB, 95 dB, or 100 dB above 0.0002 microbar. The time required for threshold for a 4 500 cps pulsed tone to recover to within 20 dB and 10 dB of pre-exposure level was measured after each one-minute exposure. The pattern of recovery times indicated that (a) there is a critical intensity (95 dB 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.

Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access