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Related Experiment Videos

Estimating the audiogram using multiple auditory steady-state responses.

Andrew Dimitrijevic1, M Sasha John, Patricia Van Roon

  • 1Rotman Research Institute, Baycrest Centre for Geriatric Care, University of Toronto, Ontario.

Journal of the American Academy of Audiology
|May 25, 2002
PubMed
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Auditory steady-state responses accurately predict hearing thresholds using mixed-modulation (MM) stimuli in individuals with hearing loss. This method shows promise for audiological assessments across various frequencies.

Area of Science:

  • Audiology
  • Neuroscience
  • Hearing Science

Background:

  • Auditory steady-state responses (ASSRs) are objective measures of auditory function.
  • Accurate prediction of behavioral hearing thresholds is crucial for audiological diagnosis.
  • Mixed-modulation (MM) stimuli offer a novel approach for auditory evoked potentials.

Purpose of the Study:

  • To evaluate the efficacy of MM stimuli in evoking ASSRs.
  • To compare physiologic thresholds derived from MM stimuli with behavioral pure-tone thresholds.
  • To assess the MM stimuli's effectiveness in individuals with sensorineural and simulated conductive hearing loss.

Main Methods:

  • Evoked multiple auditory steady-state responses using eight tonal stimuli with simultaneous amplitude and frequency modulation.

Related Experiment Videos

  • Varied modulation frequencies (80-95 Hz) and carrier frequencies (500, 1000, 2000, 4000 Hz).
  • Measured differences between physiologic and behavioral thresholds for air and bone conduction, with and without noise masking.

    • Main Results:

    • Physiologic-behavioral threshold differences for air conduction were small and consistent across carrier frequencies (5-14 dB).
    • Similar results were observed in subjects with simulated conductive hearing loss.
    • Bone-conducted MM stimuli also yielded small threshold differences, which were attenuated by white noise.

    Conclusions:

    • MM stimuli reliably predict behavioral hearing thresholds in individuals with sensorineural and conductive hearing impairments.
    • ASSRs evoked by MM stimuli are a viable and accurate tool for audiological assessment.
    • This technique holds potential for objective hearing evaluation across a range of frequencies.