A Randomized Controlled Trial for Audiovisual Multisensory Perception in Autistic Youth

Area of Science:

• Neuroscience
• Developmental Psychology
• Speech and Hearing Sciences

Background:

• Autism Spectrum Disorder (ASD) is characterized by differences in sensory processing, including audiovisual integration.
• Temporal binding windows (TBWs) for audiovisual speech perception can be altered in autistic individuals.
• Previous research in neurotypical adults suggests TBWs can be narrowed through perceptual training.

Purpose of the Study:

• To evaluate the efficacy of a computer-based perceptual training program aimed at narrowing TBWs in autistic youth.
• To determine if treatment outcomes vary based on individual characteristics such as IQ and co-occurring impairments.

Main Methods:

• Thirty autistic youth (ages 8-21) were randomly assigned to either a perceptual training group (n=15) or a control group (n=15).
• Participants underwent a brief, computer-based perceptual training targeting audiovisual speech integration.
• Outcome measures included changes in TBWs for trained and untrained stimuli and perception of the McGurk illusion.

Main Results:

• The perceptual training group did not show significant average improvements in TBWs or McGurk illusion perception compared to the control group.
• Autistic youth with higher language and nonverbal IQ scores demonstrated benefits from the training.
• Conversely, the training led to widened TBWs in youth with co-occurring cognitive and language impairments.

Conclusions:

• Computer-based perceptual training for audiovisual speech integration may not be universally effective for autistic youth.
• Individual characteristics, particularly cognitive and language abilities, significantly moderate treatment outcomes.
• Further research is needed to tailor interventions for audiovisual processing differences in ASD.