Abstract
Previous investigations of the time constants associated with suppression and recovery from suppression of spontaneous otoacoustic emissions (SOAEs) by pulsed external tones have shown that limit-cycle-oscillator models of SOAEs provide a basis for qualitative and quantitative interpretation of SOAE behavior [Talmadge etal., MechanicsandBiophysicsofHearing, edited by P. Dallos etal., pp. 235–242 (1990)]. The Van der Pol limit-cycle oscillator model is generalized to the case of two external driving tones, one continuous and the other pulsed. The continuous tone introduces a suppressed SOAE amplitude that is further modulated by the pulsed suppressor component. The model predicts that suppression onset and recovery times will increase with increases in the amount of suppression from the continuous suppressor tone. Preliminary data indicate that the onset and recovery times are affected in the manner implied by the model. [Work supported by NIH-NIDCD Grant No. DC 00307.]
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