Correlation between amplitude and frequency fluctuations of spontaneous otoacoustic emissions

The normalized cross-correlation function between the amplitude and frequency fluctuations of 11 spontaneous otoacoustic emissions was measured. A significant correlation was found in seven subjects. The correlation coefficient ranged from -0.37 to +0.65 across subjects. In four subjects, the amplit...

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Veröffentlicht in:The Journal of the Acoustical Society of America 1994-07, Vol.96 (1), p.163-169
Hauptverfasser: van Dijk, P, Wit, H P, Tubis, A, Talmadge, C L, Long, G R
Format: Artikel
Sprache:eng
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Zusammenfassung:The normalized cross-correlation function between the amplitude and frequency fluctuations of 11 spontaneous otoacoustic emissions was measured. A significant correlation was found in seven subjects. The correlation coefficient ranged from -0.37 to +0.65 across subjects. In four subjects, the amplitude fluctuation lagged the frequency fluctuation. The time lag was between 1.6 and 5.5 ms. The results were interpreted using a noise-perturbed limit-cycle oscillator with nonlinear (Duffing) stiffness as a model for a spontaneous emission. The data show that the relative increase of the nonlinear stiffness in this model was between -0.010 and +0.015. This indicates that an even-order nonlinear stiffness plays a minor role in the emission generator.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.411438