Abstract
The second-by-second frequency stability of a spontaneous otoacoustic emission is purportedly high [W. Bialek and H. P. Wit, Phys. Lett. A 104, 173–178 (1984)], although minute-by-minute recordings have shown less stability. Additionally, while spontaneous emissions have been described as stable over years in a few subjects, diurnal and monthly variations have been reported for a few others [W. Fritze, Arch. Otorhinolaryngol. 238, 189–196 (1983); H. P. Wit, Hear. Res. 18, 197–199 (1985)]. To partially clarify this issue, spontaneous emissions were recorded from 11 normal-hearing adults. Diurnal, weekly, and monthly stability and variation of frequency amplitude were analyzed over the course of 2 months. Preliminary results indicate impressive intrasubject frequency and intensity variations. Final results are discussed with respect to theoretical modeling of active processes in the cochlea. [Work supported by the Knowles Research Foundation.]
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