Loudness Adaptation Induced Interaurally and Monaurally
Loudness is unusually stable. Unlike most other sensations, it does not decline over time simply as the result of continued stimulation. The failure of loudness to adapt under most listening conditions poses an intriguing question. Just what keeps loudness from adapting? To help answer that question, we have investigated two of those conditions under which loudness does adapt, at levels below about 30 dB SL (Scharf, 1983) and in the presence of a contralateral intermittent sound (Botte et al., 1982). The present paper extends the latter investigation. First we review the phenomenon which we have called induced loudness adaptation and present new data on the effect of intermittency. Second we examine the reduction in the loudness of a continuous tone while a 10-s tone is present in the contralateral ear; particular attention is paid to frequency selectivity. Third we show that loudness adaptation can be induced by an intermittent tone in the same ear(s) as the continuous tone, whether the tones are presented through earphone(s) or from loudspeaker(s) in a free field.
KeywordsFatigue Azimuth Dura Beating Tone
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