Abstract
The nSFOAE is a nonlinear version of the stimulus-frequency otoacoustic emission (SFOAE). In past research, when a wideband noise was presented simultaneously with an ipsilateral 4.0-kHz tone, the nSFOAE to the tone showed a brief hesitation and then a gradual rise that asymptoted after about 100 ms. A similar dynamic response was also seen when the noise was low-pass filtered at 3.8 kHz. However, no dynamic response was seen when the noise was band-passed (400 Hz wide, centered at 4.0 kHz) or high-passed above 4.2 kHz. The interpretation is that the medial olivocochlear efferent system is activated by the wideband and low-pass noises. To identify the frequency components of the noise that are most relevant for activating the rising dynamic response, the nSFOAE was measured for the 4.0-kHz tone in the presence of 400-Hz bands of noise having a spectrum level of about 30-dB SPL and centered at 3.6, 3.2, 2.8, 2.4, and 2.0 kHz. Further exploration was done with noise bands 200 Hz in width and of 33-dB SPL spectrum level, as well as with additional frequencies of the tone. There were individual differences in the frequency regions yielding the maximum dynamic nSFOAE response. [Work supported by NIDCD.]
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