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Effects of aging on audio-visual speech integration.

Aurélie Huyse1, Jacqueline Leybaert1, Frédéric Berthommier2

  • 1Université Libre de Bruxelles, Avenue F.D. Roosevelt, 50, CP 191, 1050 Brussels, Belgium.

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Aging affects audio-visual speech integration, particularly with degraded visual cues. Older adults show reduced audio-visual gain when lipreading is impaired, but can compensate using auditory information in specific noise conditions.

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Area of Science:

  • * Neuroscience
  • * Audiology
  • * Gerontology

Background:

  • * Audio-visual speech integration is crucial for understanding speech, especially in noisy environments.
  • * Aging can impact sensory processing and multisensory integration.
  • * The effects of aging on audio-visual speech perception require further investigation.

Purpose of the Study:

  • * To investigate the impact of aging on audio-visual speech integration.
  • * To examine how visual cue quality and noise characteristics influence audio-visual integration in young and older adults.
  • * To analyze age-related differences in audio-visual speech perception using the fuzzy-logical model of perception.

Main Methods:

  • * A syllable identification task was used with auditory-only, visual-only, and audio-visual conditions.
  • * Visual cues were presented as clear or degraded, and stimuli were embedded in stationary or modulated noise.
  • * Participants included 15 young adults and 15 older adults; data analyzed using the fuzzy-logical model of perception.

Main Results:

  • * Older adults maintained lipreading ability with clear visual input but not degraded input.
  • * Audio-visual gain was similar in both groups with clear visual cues, indicating preserved integration.
  • * With degraded visual cues and stationary noise, older adults showed reduced audio-visual gain but could compensate using auditory information.

Conclusions:

  • * Aging impacts audio-visual speech integration, particularly when visual information is degraded.
  • * Older adults may rely more on auditory information to compensate for reduced lipreading abilities.
  • * The fuzzy-logical model of perception highlights an increased weight of audition in older adults' audio-visual integration.