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Multiple auditory steady state response thresholds to bone conduction stimuli in adults with normal and elevated
Ieda M Ishida1, Brielle P Cuthbert, David R Stapells
1School of Audiology and Speech Sciences, The University of British Columbia, Vancouver, British Columbia, Canada.
Ear and Hearing
|January 6, 2011
Summary
Bone conduction auditory steady-state responses (BC-ASSR) estimate hearing thresholds in adults with sensorineural hearing loss (SNHL). BC-ASSR accurately classifies normal versus elevated thresholds, especially at higher frequencies.
Area of Science:
- Audiology
- Neuroscience
- Hearing Science
Background:
- Auditory steady-state responses (ASSRs) to air conduction (AC) stimuli estimate audiograms.
- Bone conduction (BC) results are crucial for determining hearing loss type.
- Limited BC-ASSR data exists, particularly for hearing-impaired individuals.
Purpose of the Study:
- Determine BC-ASSR thresholds in normal-hearing and sensorineural hearing loss (SNHL) adults.
- Evaluate BC-ASSR's ability to differentiate normal from elevated BC thresholds.
- Compare BC-ASSR with simulated and actual SNHL.
Main Methods:
- Two studies assessed multiple ASSR and behavioral BC thresholds (500-4000 Hz).
- Study A used AC masking in normal-hearing adults.
- Study B included normal-hearing and SNHL adults, using a B71 bone oscillator.
Main Results:
- High correlations between behavioral and BC-ASSR thresholds (0.73–0.94).
- BC-ASSR accurately classified 89% of thresholds as normal or elevated (92% at 1000–4000 Hz).
- Threshold differences were similar between SNHL and simulated hearing loss groups.
Conclusions:
- BC-ASSR provides a reliable estimate of BC behavioral thresholds in adults, particularly at 1000–4000 Hz.
- Results for SNHL individuals mirror those with simulated hearing loss.
- Further research on BC-ASSR in infants with hearing loss is warranted.
