Year: 1979
Type: conference-abstract
Abstract: Human subjects (N = 106) were exposed in a diffuse sound field for 24 h to a wide-band noise with an A-weighted sound level of 92.5 dB. The noise was intermittent with on times of 1. 10, 100, 1000 or 10 000 s. Duty-cycle was 50%, 75%, or 90%. During an exposure, the subject was removed from the noise, temporary threshold shifts were measured, and the subject was returned to the noise. Regardless of the on-time or duty-cycle TTSs increased for about 8-12 h, and measurements of TTS after 24 h of exposure were nearly identical with those measured after 8 h. The magnitude of TTS was related in a complicated manner to on-time and duty-cycle. For on-times greater than about 4000 s (≈66 min) the magnitude of TTS approached or equaled the TTS produced by a steady-state exposure. For on times less than about 1000 s but greater than 10 s, TTS is directly related to duty cycle. For on-times of 1 s or less and duty-cycles greater than 50%, TTS appears to approach the TTS produced by a steady-state exposure. [Work supported by NIEHS.]
DOI: 10.1121/1.2016975
Authors: J. H. Mills, R. M. Gilbert, W. Y. Adkins, L. Kulish
Institution: Medical University of South Carolina
Language: English
Subfield: Sensory Systems
Field: Neuroscience
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W1993925403