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Estimating audiometric thresholds using auditory steady-state responses.

Terence W Picton1, Andrew Dimitrijevic, Maria-Cecilia Perez-Abalo

  • 1Rotman Research Institute, Baycrest Centre for Geriatric Care, University of Toronto, Canada. tpicton@rotman-baycrest.on.ca

Journal of the American Academy of Audiology
|April 23, 2005
PubMed
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Human auditory steady-state responses (ASSRs) reveal electrophysiological recruitment in hearing-impaired individuals. Recording time reduces ASSR thresholds and variability, particularly in those with hearing loss.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Auditory steady-state responses (ASSRs) are objective measures of auditory function.
  • Sensorineural hearing impairment affects elderly populations, necessitating reliable diagnostic tools.
  • Understanding ASSR characteristics across different age groups and hearing statuses is crucial.

Purpose of the Study:

  • To investigate human auditory steady-state responses (ASSRs) in young normal-hearing, elderly normal-hearing, and elderly hearing-impaired subjects.
  • To characterize amplitude-intensity functions and ASSR thresholds in relation to sensation level (SL).
  • To evaluate the effect of recording time on ASSR thresholds and their variability.

Main Methods:

  • ASSRs were recorded in three groups: young normal, elderly normal, and elderly hearing-impaired subjects.

Related Experiment Videos

  • Stimulus rates ranged from 78-95 Hz.
  • Amplitude-intensity functions were analyzed relative to sensation level (SL), and thresholds were determined over time.

    • Main Results:

    • Amplitude increased with stimulus intensity in all groups.
    • Hearing-impaired subjects exhibited faster amplitude increases just above threshold (electrophysiological recruitment).
    • ASSR thresholds and intersubject variability decreased with increased recording time and were lower in hearing-impaired subjects.

    Conclusions:

    • Electrophysiological recruitment is observable in sensorineural hearing impairment using ASSRs.
    • Increased recording duration improves ASSR threshold estimation and reduces variability.
    • ASSRs are a valuable tool for assessing hearing function, especially in elderly individuals with hearing loss.