Effects of intense pure tones on auditory temporal acuity.
Department of Speech-Language-Hearing, University of Kansas, Lawrence, Kansas 1987 Jan; :1-121
Attempts were made to study subtle, temporary changes in auditory temporal acuity (ATA) brought about by listening to intense sounds for a brief period of time. The study group consisted of five normal hearing young adults. The frequency of the sounds used was either 0.4 kilohertz (kHz) or 1.7kHz. A gap detection threshold (GDT) procedure was used to measure ATA before and after exposure. The physical parameters of the exposure tones were selected to induce three levels of temporary threshold shifts (TTS) over a limited frequency range. GDTs obtained under certain stimulus conditions following the 1.7kHz exposure were larger than those obtained prior to the exposure. These postexposure effects, however, paralleled changes in absolute threshold suggesting that changes in ATA are simply a manifestation of elevated absolute thresholds. Evidence was presented which supported this theory: only low level stimulus conditions produced significant shifts in GDT; GDT shift magnitude was correlated with the size of the TTS; in the absence of TTS, no significant changes in GDT were observed; and recovery times for shifts in GDT and absolute threshold were similar. GDT changes were not totally explained by absolute threshold shifts. Evidence was presented which suggested that temporal acuity and absolute sensitivity were both affected by the low frequency exposure. The authors recommend that both temporal acuity and absolute sensitivity measurements be undertaken when evaluations are made of the effects of low frequency exposures.
NIOSH-Grant; Noise-induced-hearing-loss; Noise-exposure; Hearing-threshold; Humans
Speech-Lang-Hear:scis/dsorders University of Kansas 290 Haworth Hall Lawrence, Kans 66045
Final Grant Report
NTIS Accession No.
Department of Speech-Language-Hearing, University of Kansas, Lawrence, Kansas
University of Kansas Lawrence, Lawrence, Kansas