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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Training sound localization in normal hearing listeners with and without a unilateral ear plug
1University Park, MRC Institute of Hearing Research, Nottingham NG7 2RD, United Kingdom.
Hearing Research
|June 7, 2011
Summary
Adults can improve sound localization through training, even with a unilateral earplug simulating hearing loss. This suggests the brain can adapt and retain original sound maps.
Area of Science:
- Auditory perception
- Psychoacoustics
- Human auditory learning
Background:
- Limited understanding of adult sound localization learning in free field.
- Sound localization relies on complex auditory cues.
Purpose of the Study:
- Investigate sound localization learning in normal-hearing adults.
- Assess the impact of unilateral conductive hearing loss on localization ability.
- Determine the effect of training during unilateral hearing loss.
Main Methods:
- Broadband noise bursts presented at 24 locations in a horizontal plane.
- Normal-hearing conditions followed by unilateral earplug insertion.
- Localization performance measured before, during, and after earplug use.
- Task-specific training administered over multiple sessions.
Main Results:
- Initial localization improvement observed in normal-hearing participants.
- Unilateral earplug caused significant localization impairment, especially ipsilaterally.
- Training with the earplug demonstrated progressive performance improvement.
- Localization returned to pre-plug levels immediately after earplug removal.
Conclusions:
- Task-specific training enhances sound localization in normal hearing.
- Auditory training can improve localization during simulated unilateral conductive hearing loss.
- The brain may form new location maps while preserving original ones during hearing loss adaptation.
