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Related Experiment Videos

Optimum threshold crossings and time-window validation in threshold pure-tone computerized audiometry.

J D Harris

    The Journal of the Acoustical Society of America
    |November 1, 1979
    PubMed
    Summary

    The ANSI criterion for hearing threshold level (HTL) testing is more efficient than the ASHA criterion, requiring fewer ascending series and saving time. Adopting the ANSI criterion with strict time windows is recommended for audiometric practice.

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    Area of Science:

    • Audiology
    • Hearing Science
    • Signal Processing

    Background:

    • Traditional audiometry uses the "10 dB down-5 dB up" rule.
    • Computerized audiometry allows for stricter response validation.
    • Existing criteria like ASHA and ANSI have different requirements for threshold determination.

    Purpose of the Study:

    • To compare the efficiency and reliability of two computerized "10 dB down-5 dB up" rule versions.
    • To evaluate the ASHA and ANSI criteria for hearing threshold level (HTL) determination.
    • To recommend optimal parameters for computerized audiometry.

    Main Methods:

    • Two computerized versions of the "10 dB down-5 dB up" rule were tested: one with lax and one with strict time-window response validation.
    • A threshold-seeking run continued until the threshold was crossed six times using 5-dB steps.

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  • The ASHA and ANSI criteria were used to assess run completion.

    • Main Results:

    • The ANSI criterion was met in 95% or more of runs within four ascending series.
    • The ASHA criterion required an average of five extra stimuli per run compared to ANSI.
    • Most runs failing the ASHA criterion still met the ANSI criterion.

    Conclusions:

    • The ANSI criterion is more efficient for determining hearing threshold levels (HTL) in computerized audiometry.
    • Adopting the ANSI criterion can save significant time per subject.
    • Strict time windows for response onset and offset are recommended for reliable threshold determination.