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Visual biasing of normal and impaired auditory speech perception
B E Walden1, A A Montgomery, R A Prosek
1Walter Reed Army Medical Center, Washington, DC.
Journal of Speech and Hearing Research
|March 1, 1990
Summary
Hearing-impaired individuals show greater susceptibility to visual biasing of auditory speech perception. This suggests long-term hearing impairment may lead to increased reliance on visual cues for speech processing.
Area of Science:
- Auditory Perception
- Intersensory Integration
- Speech Science
Background:
- Intersensory biasing involves cross-modal influences on perception.
- Visual cues can alter auditory speech perception.
- The impact of hearing impairment on this phenomenon is not fully understood.
Purpose of the Study:
- To investigate visual biasing of auditory stop consonant perception.
- To clarify the role of hearing impairment in susceptibility to visual speech cues.
- To explore potential compensatory mechanisms in hearing-impaired individuals.
Main Methods:
- Two experiments using computer-generated /ba-da-ga/ continua.
- Auditory stimuli presented alone and with synchronized visual articulatory cues (/ba/, /ga/).
- Labeling functions analyzed for normal-hearing and hearing-impaired participants, with and without background noise.
Main Results:
- Hearing-impaired observers showed significantly greater susceptibility to visual biasing than normal-hearing observers.
- Normal-hearing individuals in background noise exhibited increased reliance on visual cues, mimicking hearing-impaired patterns.
- Results suggest long-term hearing impairment may foster a greater reliance on visual speech information.
Conclusions:
- Hearing impairment enhances susceptibility to visual biasing of auditory speech.
- Individuals with hearing loss may develop a compensatory reliance on visual cues.
- Findings contribute to theories of intersensory bias and auditory-speech processing.