Abstract
The impact of external tones on spontaneous otoacoustic emissions (tonelike stimuli of cochlear origin) depends on both the level and relative frequency of such tones. The most commonly measured kinds of interaction are suppression, beating, and entrainment. Psychophysical correlates of these forms of interaction are masking, monaural diplacusis. and some aspects of threshold microstructure. The relation between the different acoustic and psychophysical observations is investigated in three individuals with large spontaneous emissions both under normal circumstances and when the emissions are reduced by aspirin consumption. The acoustic observations will be compared to the output of digital cochlear models which assume that an otoacoustic emission can be modeled as a limit-cycle oscillator.
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