Measurement of impulse noise‐induced temporary threshold shift in endangered and protected animals—Two case studies

1999 ◽  
Vol 105 (2) ◽  
pp. 932-932
Author(s):  
Ann E. Bowles ◽  
Larry Wolski ◽  
Erik Berg ◽  
Pamela K. Yochem
Keyword(s):  
Case Studies ◽  
Impulse Noise ◽  
Threshold Shift ◽  
Temporary Threshold Shift

Noise

2010 ◽  
pp. 1432-1434
Author(s):  
Syed M. Ahmed ◽  
Tar-Ching Aw
Keyword(s):  
Hearing Loss ◽  
United Kingdom ◽  
Impulse Noise ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Noise Induced Hearing Loss ◽  
The United Kingdom ◽  
Human Ear

For clinical purposes, noise is measured in decibels weighted according to the sensitivity of the human ear (dB(A)). Regardless of source, the effects of overexposure to noise are similar. Initially there is a temporary threshold shift, where reversibility of hearing loss is possible with removal away from further noise. Permanent threshold shift occurs following prolonged and/or intense exposure, with poor prospects for improvement of hearing. The classical audiogram for noise-induced hearing loss shows a 4 kHz dip. Prevention is by reducing exposure to noise at source, and in the United Kingdom a limit for exposure has been set at 87 dB(A) averaged over an 8-h day or 140 dB(A) for any instantaneous impulse noise....

scholarly journals Temporary threshold shift after impulse-noise during video game play: Laboratory data

2014 ◽  
Vol 53 (sup2) ◽  
pp. S53-S65 ◽  
Author(s):  
C. Spankovich ◽  
S. K. Griffiths ◽  
E. Lobariñas ◽  
K. E. Morgenstein ◽  
S. de la Calle ◽  
...  
Keyword(s):  
Video Game ◽  
Impulse Noise ◽  
Laboratory Data ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Game Play ◽  
Video Game Play

The relation between temporary threshold shift and permanent threshold shift in rhesus monkeys exposed to impulse noise

1973 ◽  
Vol 76 (sup312) ◽  
pp. 5-15 ◽  
Author(s):  
George A. Luz ◽  
James D. Mosko ◽  
John L. Fletcher ◽  
William J. Fravel
Keyword(s):  
Rhesus Monkeys ◽  
Impulse Noise ◽  
Threshold Shift ◽  
Temporary Threshold Shift

Temporary threshold shift due to recreational firearm use

2006 ◽  
Vol 121 (10) ◽  
pp. 927-931 ◽  
Author(s):  
U Bapat ◽  
N Tolley
Keyword(s):  
Observational Study ◽  
Impulse Noise ◽  
Noise Exposure ◽  
Threshold Shift ◽  
Small Study ◽  
Temporary Threshold Shift ◽  
Significant Preference ◽  
Industrial Noise ◽  
Before And After ◽  
Clinically Significant

Objective: To assess whether a temporary threshold shift occurred after recreational firearm use.Design: An observational study of 25 subjects using ear protection in an indoor rifle range. Hearing was evaluated before and after shooting five rounds with a 0.22 calibre rifle over 10 minutes. A threshold shift of 5 dB was found to be statistically significant, while a shift of 10 dB was clinically significant.Results: Twenty-four candidates had a statistically significant threshold shift, while 12 had a clinically significant threshold shift. Two subjects with previous industrial noise exposure had threshold shifts at more frequencies than other subjects. There was no significant preference for either ear. One subject showed no changes.Conclusion: This small study sheds some light on impulse noise behaviour in an indoor shooting range, but no definite conclusions can be drawn. The side of shooting did not influence threshold changes in either ear.

Decay of Temporary Threshold Shift in Noise

1973 ◽  
Vol 16 (2) ◽  
pp. 267-270 ◽  
Author(s):  
John H. Mills ◽  
Seija A. Talo ◽  
Gloria S. Gordon
Keyword(s):  
Sound Field ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Octave Band ◽  
Band Noise ◽  
Lower Asymptote

Groups of monaural chinchillas trained in behavioral audiometry were exposed in a diffuse sound field to an octave-band noise centered at 4.0 k Hz. The growth of temporary threshold shift (TTS) at 5.7 k Hz from zero to an asymptote (TTS ∞ ) required about 24 hours, and the growth of TTS at 5.7 k Hz from an asymptote to a higher asymptote, about 12–24 hours. TTS ∞ can be described by the equation TTS ∞ = 1.6(SPL-A) where A = 47. These results are consistent with those previously reported in this journal by Carder and Miller and Mills and Talo. Whereas the decay of TTS ∞ to zero required about three days, the decay of TTS ∞ to a lower TTS ∞ required about three to seven days. The decay of TTS ∞ in noise, therefore, appears to require slightly more time than the decay of TTS ∞ in the quiet. However, for a given level of noise, the magnitude of TTS ∞ is the same regardless of whether the TTS asymptote is approached from zero, from a lower asymptote, or from a higher asymptote.

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