Auditory Adaptation in Noise

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Abstract
The initial rate, extent, and recovery from auditory adaptation were measured in both the presence and absence of noise in 10 normal ears by the method of fixed intensity at 250, 1000, and 4000 cps. The initial rate and extent of adaptation to a tone in noise is greater than to the tone alone at 4000 cps, but not at either 250 or 1000 cps. Recovery from adaptation to tones in both noise and quiet is equivalent, but never complete, at each frequency. When the noise is sustained in one ear and a tone introduced over the noise at 1-min intervals, there is a systematic decline in response at 250 and 1000 cps, but not at 4000 cps. When the noise is not sustained, but follows the same periodic intervals as the tone, there is a decline in response at 4000 cps, but not at either 250 or 1000 cps.

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