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PubMed1979

[Auditory fatigue in individuals having sustained an acoustic trauma (author's transl)].

A comparison was made between losses of auditory sensitivity after a fatiguing sound exposure of the ear in two groups of subjects: audiometrically normal subjects and subjects with early acoustic trauma. Subjects with cochlear impairment sustained an auditory loss apparently less than that of normal subjects when this loss is measured at threshold level. However, at supraliminal levels the loss of sensitivity, as measured here, would seem to be equal in both groups of subjects. In fact, the dynamics of sonic variations, already reduced by the cochlear impairment, is even further decreased by the effects of fatigue.

Audiometry↗
PubMed1984

[Limits between normal and pathologic auditory fatigue following acoustic stress with high peak pressures in its significance for acoustically-induced hearing loss].

The extent of hearing fatigue as a consequence of acoustic impacts is an important factor in predicting an anticipated hearing impairment. It is essential to know whether hearing fatigue is due to physiological or pathological conditions. Mass screenings of thousands of soldiers suffering from hearing fatigue due to acoustic impact, showed that hearing fatigue is subject to considerable individual fluctuation. The time of recovery, or rather the time required by the auditory reception to return to the preimpact threshold, is of paramount importance. Recovery from an audiometrically traceable TTS within 10 minutes can be considered unobjectionable. Recovery time of up to half an hour can be found in 10--20% of the screened personnel, depending on the impact. This is within physiological variation range and can be considered unobjectionable. Recovery times of a TTS of up to 3 hours constitute a limit beyond which pathological effects in the cochlea can be expected. Recovery times of 24 hours and more signify a definite impairment if impacts continue.

Audiometry↗
PubMed1988

Frequency selectivity in loudness adaptation and auditory fatigue.

An intermittent monaural tone may induce a decline in the loudness of a continuous tone presented to the same ear [Canévet et al., Br. J. Audiol. 17, 49-57 (1983)]. Two experiments studied the frequency selectivity of loudness adaptation induced in this manner. The method of successive magnitude estimations was used to measure the loudness of a monaural 84-s test tone before and after a single presentation of a 24-s inducer tone in the same ear. The first experiment shows that, for an inducing tone (500, 1000, or 3000 Hz) approximately 15 dB more intense than a test tone set to one of 21 different frequencies, adaptation is greatest when the two tones have the same frequency; with increasing difference between the test-tone and inducer frequencies, adaptation progressively declines. The second experiment measured frequency selectivity in the loudness reduction caused by a 1000-Hz inducer as a function of its level. As inducer level went from 75 to 95 dB (with test tone constant at 60 phons), selectivity passes progressively from the type seen in short-term or low-level fatigue (maximal for the 1000-Hz test tone) to a type seen in long-term or high-level fatigue (maximal for the 1000-Hz test tone) to a type seen in long-term or high-level fatigue (maximal at frequencies higher than that of the inducer or fatiguing tone). A common cochlear origin and a continuity between the mechanisms of ipsilaterally induced adaptation and high-level fatigue are suggested by the data.

Adaptation, Physiological↗
PubMedDate not supplied

Neurochemical basis of auditory fatigue: a new hypothesis.

Neuroactive polypeptides such as substance P and enkephalin have recently been demonstrated in the neuronal elements of the inner ear. It has been suggested that the same neuropeptides have a transmitter role in various sensory systems. Transmitter roles for the neuropeptides in the cochlear processes could provide new explanations for many physiological phenomena of hearing. The neuropeptides are particularly well suited to explain such a noise-induced auditory overloading condition as temporary threshold shift.

Animals↗
PubMed1981

Computing auditory fatigue of the whole nerve action potential.

Fatigue at the level of the VIII nerve is often calculated through the measurement of the whole nerve action potential (AP). The losses have been quantified by calculating the dB shift required to record a criterion AP voltage or by determining the ratio of the pre- and post-exposure AP voltages at a constant probe intensity. The issue raised here is whether the two methods produce similar AP losses. Fifteen rats were exposed to a 6000-Hz pure tone at either 100, 105, or 110 dB SPL for five minutes. Input-output functions were determined at five probe frequencies prior to and following exposure. When the probe intensity (i.e., AP voltage) was low, AP losses appeared greater when the AP fatigue was computed at a constant intensity. This trend was reversed at higher probe levels. These results are explained on the basis of the growth behavior of the AP.

Acoustic Stimulation↗