Audiovisual speech integration and lipreading in autism

Area of Science:

• Neuroscience
• Developmental Psychology
• Speech and Hearing Sciences

Background:

• Auditory-visual speech integration enhances speech perception, intelligibility, and processing speed.
• This integration is crucial for language development and persists throughout life.
• Individuals with autism spectrum disorder (ASD) often exhibit difficulties with multisensory integration.

Purpose of the Study:

• To investigate audiovisual speech integration in adolescents with high-functioning autism (HFA) compared to typically developing (TD) peers.
• To assess speech reception thresholds and lipreading abilities in both groups.

Main Methods:

• A speech-in-noise paradigm was employed with 18 adolescents with HFA and 19 TD adolescents.
• Speech reception thresholds were measured for auditory-only and audiovisual conditions.
• Lipreading ability was assessed.

Main Results:

• Adolescents with HFA demonstrated significantly less benefit from visual information during audiovisual speech perception compared to TD adolescents.
• Individuals with HFA performed worse on lipreading tasks.
• A unique factor, beyond auditory perception and lipreading, contributed to group differences in audiovisual integration, suggesting a specific deficit.

Conclusions:

• Deficits in audiovisual speech integration and lipreading are evident in adolescents with HFA.
• These combined challenges likely contribute to difficulties in speech comprehension.
• The findings may also be linked to delays observed in early language development for individuals with autism.