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Changes in bone conduction thresholds with vibrator contact area

J E Queller, S M Khanna

    The Journal of the Acoustical Society of America
    |June 1, 1982
    PubMed
    Summary
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    This study measured bone conduction vibration thresholds on the forehead. Force threshold varied less with contact area than acceleration threshold, suggesting force is a more stable measure.

    Area of Science:

    • Audiology
    • Biomedical Engineering
    • Human Vibration Research

    Background:

    • Bone conduction vibration is crucial for understanding auditory perception and developing assistive hearing devices.
    • Quantifying vibratory stimuli at the point of contact is essential for accurate threshold measurements.

    Purpose of the Study:

    • To directly measure force and acceleration at the threshold of bone conduction vibration on the human forehead.
    • To investigate the relationship between threshold measurements and varying contact areas.

    Main Methods:

    • An experimental bone conduction vibrator was employed to measure force and acceleration.
    • Thresholds were recorded for six subjects across a frequency range of 250–6000 Hz.
    • Measurements were taken across a contact area range from five to one.

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    Main Results:

    • Force and acceleration at threshold were directly measured at the forehead contact point.
    • Threshold force variation with contact area was significantly smaller than threshold acceleration variation.
    • This indicates force is a more consistent indicator of vibration threshold.

    Conclusions:

    • Force threshold is a more stable and reliable measure than acceleration threshold in bone conduction vibratory studies.
    • These findings have implications for the design and calibration of bone conduction devices and hearing assessments.