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Updated: Jun 14, 2025

Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Minima in cubic distortion-product otoacoustic emission input/output functions due to distributed primary sources
Václav Vencovský1, Aleš Vetešník2
1Department of Radio Engineering, Czech Technical University in Prague, Technická 2, 166 27, Prague, Czech Republic.
Abstract:
Input/output (I/O) functions of distortion-product otoacoustic emissions (DPOAEs) may contain sudden amplitude minima (notches) although they are measured in animals with a negligible reflection source. We measured DPOAEs in humans and analyzed the data by time-frequency filtering to decompose the nonlinear-distortion and coherent-reflection components of DPOAE. The presented I/O functions of the nonlinear-distortion component contain notches. We suggest that because these notches are present only in the nonlinear-distortion component, they result from destructive interference between distortion-product wavelets coming from the primary generation region. Simulations conducted with a nonlinear cochlear model showed qualitative similarities with the presented experimental results.
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