Abstract
This research represented an attempt to clarify the relations between loudness changes and threshold shifts following the cessation of an auditory stimulus. A 400-msec, 1000-Hz sinusoid served as the “fatiguer” and, following a specified recovery time, a 50-msec, 1000-Hz test stimulus was presented. The test stimulus was always delivered to the ear stimulated by the 400-msec signal, but in the case of loudness judgments, simultaneous with the test stimulus, a comparison stimulus was presented to the opposite ear. The entire stimulus sequence was recycled every 4 sec. Thresholds were obtained by varying the level of the test stimulus while loudness was determined by adjusting the level of the comparison stimulus so that loudness in the two ears was equal. In general, threshold shifts were much greater than loudness shifts when both were measured in decibels. Loudness recovery proceeded more slowly than did the recovery of threshold. The sound pressure of the 400-msec stimulus produced marked changes in the amount of threshold shift, but had little effect upon loudness.
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