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Susceptance and conductance changes in acoustic reflexometry.

D R Cunningham, T A Porter

    Journal of the American Audiology Society
    |November 1, 1975
    PubMed
    Summary

    Acoustic reflexometry reveals probe tone frequency impacts ear responses. Lower frequencies (220 Hz) caused negative susceptance and conductance changes, while higher frequencies (660 Hz) showed varied results.

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    Area of Science:

    • Audiology
    • Bioacoustics
    • Otology

    Background:

    • Acoustic reflexometry is a key diagnostic tool in audiology.
    • Understanding the influence of probe tone parameters is crucial for accurate interpretation.
    • Previous research has explored various aspects of the acoustic reflex, but probe tone frequency effects on admittance components require further elucidation.

    Purpose of the Study:

    • To investigate the effect of different probe tone frequencies (220 Hz and 660 Hz) on the acoustic reflex.
    • To analyze the magnitude and direction of susceptance and conductance changes during the acoustic reflex.
    • To determine the relationship between probe frequency and admittance changes.

    Main Methods:

    • Acoustic reflexometry was conducted on 30 otologically and audiologically normal subjects.
    • An otoadmittance meter was utilized to measure reflex responses.
    • Susceptance and conductance changes were recorded using 220-Hz and 660-Hz probe tones.

    Main Results:

    • At 220 Hz, 100% of acoustic reflexes showed negative changes in both susceptance and conductance.
    • At 660 Hz, approximately 90% of reflexes exhibited positive susceptance and negative conductance changes.
    • An inverse relationship was observed between probe frequency and the magnitude of admittance change; a direct relationship existed for input admittance phase shift and probe frequency.

    Conclusions:

    • Probe tone frequency significantly influences the direction and magnitude of admittance changes during the acoustic reflex.
    • The findings suggest that 220 Hz probe tones elicit more consistent directional admittance changes compared to 660 Hz.
    • These results have implications for optimizing acoustic reflex testing protocols and interpreting results across different frequencies.

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