Hazardous Exposure to Intermittent and Steady-State Noise

Kryter, Karl D.

doi:10.21236/ad0458244

Cited by 26 publications

(39 citation statements)

References 1 publication

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“…Nixon and Glorig (1961) found that NIPTS at 4.0 kHz after 10 years of exposure for 8 h/day was nearly identical to TTS after 8-h exposure, and that NIPTS at 4.0 kHz remained constant or nearly so after 10 years of exposure. This "coincidence" between TTS and NIPTS became a crucial assumption in the development of damage-risk criteria (Kryter et al, 1966). Of course, the data reported here and elsewhere (see Mills et al, 1979) suggest that TTS is asymptotic after 8 h of exposure.…”

Section: A Possible Application Of Tts Data To the Question Of Noisupporting

confidence: 53%

Temporary threshold shifts produced by wideband noise

Mills

Adkins

Gilbert

1981

The Journal of the Acoustical Society of America

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Groups of human subjects were exposed in a sound field to a wideband noise for 24 or for 8 h on consecutive days. The wideband noise was composed of octave bands centered at 0.5, 1, 2, and 4 kHz. For the 24-h exposure, temporary threshold shift (TSS) increased for about 8 h and then reached a plateau or asymptote. TTS's at asymptote (ATS) increased about 1.7 dB/dB increase in noise level above about 78 dBA. TTS produced by single-octave band exposures were used to predict the TTS produced by the wideband exposures. Predictions were based on the "Intensity Rule" [W. D. Ward, A. Glorig, and D. L. Sklar, "Temporary threshold shift from octave-band noise: Applications to DRC's," J. Acoust. Soc. Am. 31, 522-528 (1959)]. Predictions were acceptably accurate and the validity of the "Intensity Rule" for 24-h exposures or 8-h exposures is supported. There is a remarkable coincidence between the relation which describes ATS and noise level, and the relation which describes noise-induced permanent threshold shift (in industrial workers) and noise level. This coincidence and animal data are used to support the hypothesis that TTS grows to an asymptote rather than a plateau, and that TTS at asymptote (ATS) produced by a given sound is an upper bound on any permanent threshold shift that can be produced by that sound.

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Section: A Possible Application Of Tts Data To the Question Of Noisupporting

confidence: 53%

Temporary threshold shifts produced by wideband noise

Mills

Adkins

Gilbert

1981

The Journal of the Acoustical Society of America

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“…The perceptual consequences of cortical map reorganization are presently unclear (see e.g., Recanzone et al, 1993;Brown et al, 2004;Han et al, 2007), but it could lead to problems with speech recognition in noise. Current standards for occupational noise exposure are intended to just prevent permanent absolute threshold shifts (Kryter et al, 1966;May, 2000). Our research suggests that centrally-based hearing impairment may result at substantially lower levels of long-term exposure, although additional research into the behavioral significance of the observed neurophysiologic changes is required.…”

Section: Discussionmentioning

confidence: 83%

Intermittent exposure with moderate-level sound impairs central auditory function of mature animals without concomitant hearing loss

Pienkowski

Eggermont

2010

Hearing Research

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“…For example, when TTS• is about 20 dB, standard deviations are reported to be 6-7 dB (Kryter et al, 1966). Melnick (1976) also shows standard deviations of 6.9-9.1 dB for human observers exposed for 24 h to an octave-band noise centered at 4.0 kHz.…”

Section: Individual Differencesmentioning

confidence: 99%

Temporary threshold shifts in humans exposed to octave bands of noise for 16 to 24 hours

Mills

Gilbert

Adkins

1979

The Journal of the Acoustical Society of America

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Groups of human subjects were exposed in a diffuse sound field for 16--24 h to an octave-band noise centered at 4, 2, 1, or 0.5 kHz. Sound-pressure levels were varied on different exposure occasions. At specified times during an exposure, the subject was removed from the noise, auditory sensitivity was measured, and the subject was returned to the noise. Temporary threshold shifts (TTS) increased for about 8 h and then reached a plateau or asymptote. The relation between TTS and exposure duration can be described by a simple exponential function with a time constant of 2.1 h. In the frequency region of greatest loss, threshold shifts at asymptote increased about 1.7 dB for every 1 dB increase in the level of the noise above a critical level. Critical levels were empirically estimated to be 74.0 dB SPL at 4 kHz. 78 dB at 2 kHz, and 82 dB at 1 and 0.5 kHz. Except for the noise centered at 4.0 kHz, threshold shifts were maximal about 1/2 octave above the center frequency of the noise. A smaller second maximum was observed also at 7.0 kHz for the noise centered at 2.0 kHz, at 6.0 kHz for the noise centered at 1.0 kHz, and at 5.5 kHz for the noise centered at 0.5 kHz. After termination of the exposure, recovery to within 5 dB of pre-exposure thresholds was achieved within 24 h or less. Recovery can be described by a simple exponential function with a time constant of 7.1 h. The frequency contour defined by critical levels matches almost exactly the frequency contour defined by the E-weighting network.

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Hazardous Exposure to Intermittent and Steady-State Noise

Cited by 26 publications

References 1 publication

Temporary threshold shifts produced by wideband noise

Temporary threshold shifts produced by wideband noise

Intermittent exposure with moderate-level sound impairs central auditory function of mature animals without concomitant hearing loss

Temporary threshold shifts in humans exposed to octave bands of noise for 16 to 24 hours

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