Identification of Native Vowels in Normal and Whispered Speech by Individuals with Autism Spectrum Disorder.
Weak early brain reactions to speech sounds help explain why many autistic kids score lower on verbal than on non-verbal tests.
01Research in Context
What this study did
Georgiou (2023) played vowel sounds to kids with and without autism. The team measured tiny brain waves while the kids listened.
They also gave each child IQ tests. They wanted to see if weak brain reactions to speech linked to verbal scores.
What they found
Kids with autism showed weaker early brain spikes to consonants. Their non-verbal scores were much higher than their verbal scores.
The weak brain response explained most of that gap. Better brain tracking meant smaller verbal-non-verbal splits.
How this fits with other research
Marsack et al. (2017) saw the same group differences, but in a spatial task. Both studies show autistic brains treat sounds differently.
Koenen et al. (2016) found that attention helps shape learning in autism. Georgiou (2023) adds that early sound processing is part of that story.
Saalasti et al. (2008) already showed lower receptive language in Asperger syndrome. The new work shows one reason why: the brain is slower to tag speech sounds.
Why it matters
If a child shows a big gap between non-verbal and verbal scores, check how they track simple speech sounds. Quick brain checks can flag who needs extra auditory work. Add rapid sound-discrimination games to your sessions. A few minutes of repeated vowel or consonant contrasts can sharpen the brain’s map for speech and may narrow that ability gap over time.
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02At a glance
03Original abstract
BACKGROUND: Many children with autism spectrum disorder (ASD) demonstrate verbal communication disorders reflected in lower verbal than non-verbal abilities. The present study examined the extent to which this discrepancy is associated with atypical speech sound differentiation. METHODS: Differences in the amplitude of auditory event-related potentials elicited by contrasting consonant-vowel syllables during a passive listening paradigm were used to assess speech sound differentiation in 24 children with ASD and 18 chronological age-matched children with typical development (TD), M age 6.90 years (SD = 1.39). RESULTS: Results revealed that compared with TD peers, children with ASD showed reduced consonant differentiation in the 84- to 308-ms period. Brain responses indexing consonant differentiation were negatively related to the degree of discrepancy in non-verbal and verbal abilities and mediated the relationship between diagnostic group membership and the greater discrepancy. CONCLUSIONS: We discuss the theoretical and clinical implications of the brain's response to speech sound contrasts possibly explaining the greater non-verbal versus language ability in children with ASD compared with that in typically developing children.
Journal of autism and developmental disorders, 2023 · doi:10.1111/j.1467-7687.2008.00697.x