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Relations between the discomfort level and the reflex threshold of the middle ear muscles.

The reflex threshold of the stapedius muscle is normally 10-20 dB lower than the limit of discomfort. Both depend upon the intensity of the internal ear stimulation. On this are based the monaural objective recruitment test by impedance measurement as well as the subjective loudness tolerance test. After prolonged sound exposure, however, both supraliminal thresholds behave differently: In persons regularly exposed to industrial noise the limit of discomfort is generally found to be shifted to considerably higher sound levels, while the reflex threshold remains normal or is only slightly raised, even in the frequency range of larger hearing losses. Experimental sound exposure in normal-hearing persons unaccustomed to industrial noise suggest the same. Hence, we have to conclude that the higher sound tolerance of workers accustomed to noise is due only to a process of central adaptation, and not to habituation of the internal ear, as has been repeatedly postulated in the present literature on industrial me...