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Bone-conduction force values for the sensorineural acuity level (SAL) test

R C Beattie, L B Daily

    The Journal of Auditory Research
    |January 1, 1982
    PubMed
    Summary
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    The sensorineural acuity level (SAL) test offers efficient hearing assessment but requires normative data. This study establishes new force level norms using an artificial mastoid for improved SAL test calibration and clinical application.

    Area of Science:

    • Audiology
    • Hearing Science
    • Medical Instrumentation

    Background:

    • The sensorineural acuity level (SAL) test simplifies audiometry by removing masking issues.
    • Conventional bone-conduction (BC) testing for cochlear sensitivity is less efficient and prone to errors.
    • A limitation of the SAL test is the reliance on time-consuming real-ear calibration for normative data.

    Purpose of the Study:

    • To establish normative force levels for the SAL test using an artificial mastoid.
    • To provide a more efficient and accurate calibration method for SAL testing.
    • To facilitate the assessment of conductive hearing pathology.

    Main Methods:

    • 18 normal-hearing young adults were tested using pure tones and spondees.
    • Bone-conduction white noise was delivered via a Radioear B-70-AA vibrator.

    Related Experiment Videos

  • Calibration was performed using a Bruel & Kjaer 4930 artificial mastoid to determine force levels.

    • Main Results:

    • Specific force levels (dB re 1 mu Newton) were determined for pure tones and spondees in white noise.
    • Force levels for narrow bands of noise at different frequencies were also established.
    • These values provide a basis for artificial mastoid calibration of the SAL test.

    Conclusions:

    • Artificial mastoid calibration offers a more satisfactory procedure for establishing SAL test norms.
    • Clinicians should use caution with provided force values unless equipment is similar.
    • The SAL test is recommended as part of a battery for assessing conductive hearing loss.