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Speech perception without hearing.

L E Bernstein¹, M E Demorest, P E Tucker

¹Department of Communication Neuroscience, House Ear Institute, Los Angeles, California 90057, USA. lbernstein@hei.org

Perception & Psychophysics

|March 21, 2000

Summary

Individuals with impaired hearing (IH) showed enhanced visual phonetic speech perception compared to those with normal hearing (NH). This suggests that the need to perceive speech visually can improve visual phonetic skills.

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Area of Science:

Audiology and Speech Sciences
Visual Perception
Human Communication

Background:

Visual phonetic speech perception is crucial for understanding speech without auditory cues.
Previous research has explored factors influencing visual speech perception, but less is known about enhanced abilities in hearing-impaired individuals.

Purpose of the Study:

To investigate and compare visual phonetic speech perception abilities between adults with normal hearing (NH) and impaired hearing (IH).
To determine if impaired hearing is associated with enhanced visual phonetic perception skills.

Main Methods:

Participants (n=96 NH, n=72 IH) identified consonant-vowel (CV) nonsense syllables and words in isolation and sentences, using only visual stimuli.
Measures included proportion of phonemes correct, transmitted feature information, and phoneme substitution entropy.
Analysis focused on group differences and correlations between various phonetic perception measures.

Main Results:

The hearing-impaired (IH) group demonstrated significantly greater sensitivity to visual phonetic information compared to the normal hearing (NH) group.
Feature information transmission correlated with word scores in the IH group, unlike the NH group.
Phoneme errors were more systematic in IH individuals, and individual differences in CV perception strongly predicted word and sentence performance for the IH group.

Conclusions:

The necessity to perceive speech visually may lead to enhanced visual phonetic perception abilities in some individuals with impaired hearing.
Findings suggest that the brain may adapt and enhance visual speech processing mechanisms when auditory input is compromised.

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