Loudness "fatigue" with two ears but not with one: simultaneous dichotic loudness balance (SDLB) explained
In SDLB (1950 onwards), the loudness contribution from the continually exposed â€œfatiguingâ€ ear is matched by adjusting the intensity of an intermittent stimulus at the other (â€œcomparisonâ€) ear. The latter intensity declines, indicating â€œloudness fatigueâ€. However, the loudness of a continuous well-supra-threshold stimulus to one ear (with the other in quiet) does not diminish. Here is a quandary, presently resolved through a novel model dependent upon (1) the aforementioned non-fatiguing, and (2) the olivocochlear bundle, which â€œturns down the volumeâ€ in the ear opposite to one experiencing stimuli. The model explains how â€œfatigueâ€ varies with stimulus variation, revealing â€œfatigueâ€ as an SDLB artifact.
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