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Results for “Auditory Fatigue”

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At least 91 records · Page 5Linked to original sources
PubMed1980

Influence of auditory fatigue on masked speech intelligibility.

Intelligibility of PB word lists embedded in simultaneous masking noise was evaluated before and after fatiguing-noise exposure. Intelligibility was determined by observing the number of words correctly repeated during a shadowing task. Both the speech signal and the masking noise were filtered to a 2825-3185 Hz band. Masking-noise levels were varied from 0- 90-dB SL. Fatique was produced by a 1500-3000-Hz octave band of noise at 115 dB (re 20 muPa) presented continuously for 5 min. The results of three experiments indicated that speech intelligibility was reduced when the speech was presented against a background of silence but that the fatiguing-noise exposure had no effect on intelligibility when the speech was made more intense and embedded in masking noise of 40-90-dB SL. These observations are interpreted by considering the recruitment produced by fatique and masking noise.

Auditory Fatigue↗
PubMed1983

[The use of an automatic device for recording the recovery time from auditory fatigue in flight personnel exposed to noise].

The results of a study conducted on individuals exposed to aeronautical environment noise (flight personnel, runway operators, mechanics etc.) are reported. A particular suprathreshold automatic audiometric technique, called P.A.T. (automatic Peyser test) was used because there was evidence that it was more trustworthy than other suprathreshold tests and because this test permits a graphic follow-up of the dynamic evolution of "uditive fatique" phenomenon. The conclusion is drawn with this method it is possible to evaluate more precisely both the entity of the damage and on possible suffering of Corti's organ in individuals exposed to noise, and the simplicity of the test is underlined. Moreover the test is advantageous because it can be done using the normal routine diagnostic apparatus.

Aircraft↗
PubMed1975

The effect of the parasympathetic autonomic nervous system on auditory fatigue.

Volunteers with normal hearing were tested for vegetative balance with the aid of vegetative reflexes and with the aid of the atropine test. The effect of white noise stimulated on hearing thresholds was then investigated together with their recovery. The vegetative system was affected experimentally by intravenous administration of atropine, and the beginning and recession of hearing fatigue was observed. Atropine caused a small change only. In a similarly arranged experiment, 1% pilocarpin administered subcutaneously in a dose of 1.4 minus 1.6 ml, resulted in increased hearing fatigue and retarded recovery at higher frequencies. The effect of pilocarpin is explained by the fact that it supports the inhibitory processes checked by the parasympathetic nervous system on the periphery.

Acetylcholine↗
PubMedDate not supplied

Auditory fatigue in patients with stapedius muscle paralysis.

Experiments were performed in 18 patients with peripheral facial palsy (Bell's palsy) including unilateral stapedius muscle paralysis. After exposure to narrow band noise centered at 0.5 kHz temporary threshold shift at 0.75 kHz was significantly higher in the ear with paralysis than in the normal ear. After exposure to 2.0 kHz narrow band noise there was no difference in TTS at 3.0 kHz between affected and non-affected ear. It was concluded that the stapedius reflex has a protective function against low frequency sound exposure and suggested that this protection might be extended to higher frequencies only when high frequency noise also contains low frequency components.

Acoustic Stimulation↗
PubMed1987

Effects of auditory fatigue on psychophysical estimates of cochlear nonlinearities.

Two-tone-suppression (2TS) effects and cubic-difference-tone (CDT) levels were measured using a forward-masking procedure, before and after exposure to an intense tonal stimulus. Changes in 2TS effects were consistent with a change in the nonlinearity, such that the system became more linear, in addition to changes due to attenuation of the primary stimuli F1 and F2. Changes in CDT levels could be accounted for on the basis of a temporary threshold shift at F1 and F2. These results indicate at least a partial dissociation of the mechanisms underlying 2TS and CDT generation.

Acoustic Stimulation↗
PubMedDate not supplied

[Auditory fatigue in man. Comparison of recovery at threshold and above threshold].

Using a 1 000-Hz pure tone, a TTS2 of 20 dB was produced in a group of subjects. Recovery from this TTS was studied at 1 500 Hz and the measurements were extended to 320 min to encompass the course of recovery, The recovery of the temporary impairment of threshold was plotted concurrently with that of the temporary masked threshold shift (TMTS) of the 1 500 Hz tone in the presence of a 700 Hz masking tone. This technique provided an indirect measurement of loudness loss at 10. 20, 30, 40, 50 and 60 dB SL. The time required for complete recovery depended upon whether one measured TTS or TMTS; the longest recovery times were, in respect of the masked threshold, at low sensation levels.

Acoustic Stimulation↗