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Infant Auditory Processing and Event-related Brain Oscillations
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Analyzing Stimulus-frequency Otoacoustic Emission Fine Structure Using an Additive Model.

Yin Liu, Fei Ji, Qin Gong

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 6, 2020
    PubMed
    Summary

    Investigating stimulus-frequency otoacoustic emission (SFOAE) fine structure in humans, this study reveals it arises from the complex addition of cochlear reflections. The model explains spectral notches as resulting from interactions between short- and long-latency components.

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    Area of Science:

    • Auditory Neuroscience
    • Otoacoustic Emissions
    • Human Physiology

    Background:

    • Stimulus-frequency otoacoustic emissions (SFOAEs) exhibit fine structure, but its origin and dependence on probe level remain unclear.
    • Understanding SFOAE fine structure is crucial for potential clinical applications in audiology.
    • Previous models have not fully elucidated the underlying mechanisms of SFOAE fine structure.

    Purpose of the Study:

    • To investigate the origin of SFOAE fine structure in humans using a novel two-component additive model.
    • To determine the relationship between probe level and SFOAE fine structure characteristics.
    • To explore the contribution of cochlear reflections to SFOAE amplitude, phase, and delay fine structure.

    Main Methods:

    • Development of a two-component additive model to separate SFOAEs into short- and long-latency components.
    • Application of the time windowing method for unmixing SFOAEs.
    • Analysis of SFOAEs in human participants across a range of sound pressure levels (40-70 dB SPL).

    Main Results:

    • The two-component model predicts spectral notches in SFOAE amplitude fine structure occur when short- and long-latency components have opposing phases and similar magnitudes.
    • The depth of spectral notches is significantly correlated with the amplitude difference and phase opposition between these components.
    • Independent evidence supports the model, indicating SFOAE fine structure results from the addition of multiple internal cochlear reflections.

    Conclusions:

    • SFOAE fine structure in humans is a consequence of the complex addition of at least two internal cochlear reflections with varying phase slopes.
    • The probe level influences the interaction between these components, leading to observable fine structure patterns.
    • This research provides a mechanistic explanation for SFOAE fine structure, with implications for understanding cochlear mechanics and developing diagnostic tools.