Spontaneous otoacoustic emissions: Evidence for a cricadian rhythm of frequency variation

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Abstract
An investigation of the hour-by-hour frequency stability of spontaneous otocacoustic emissions was conducted over a 24-h period. Two emissions were recorded from each of two audiometrically normal adults. Time series analysis was used to model the autocorrelation structure of the measurements, to resolve each 24-h series of measurements into cyclical components of various periodicities, and to test the statistical significance of given cycles within the spectrum of each series. Results showed a significant 24-h cycle for all emissions, suggesting a circadian rhythm of frequency fluctuation. [Work supported by the Knowles Research Foundation.]

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