Reduced Neural Specialization for Word-level Linguistic Prosody in Children with Autism.

Researchers studied how autistic and non-autistic children's brains respond to speech patterns and rhythms. Both groups could detect differences between familiar and unfamiliar speech patterns, but their brains processed this information differently. Non-autistic children showed left-brain specialization for these speech patterns, while autistic children didn't show this typical brain organization. This suggests autistic children process speech and language differently at a fundamental brain level.

This study examined brain responses to word-level prosody (speech rhythm and intonation patterns) in 21 autistic children and 25 neurotypical peers using EEG. Both groups showed similar neural responses to native versus non-native prosodic patterns, but differed in brain lateralization. Neurotypical children displayed left-hemisphere specialization for prosodic processing, while autistic children showed no such lateralization. The findings were specific to prosodic phonology (meaningful sound patterns) rather than acoustic features alone.

This extends previous research on atypical language lateralization in autism to include sub-lexical prosodic processing, suggesting fundamental differences in how autistic children's brains organize language-related neural networks.

Findings suggest autistic children may process speech prosody using different neural pathways than neurotypical peers. This could inform language intervention approaches, though clinical significance unclear. May help explain some communication differences observed in autism.

Small sample size (21 autistic children). Study design and methodology details not fully described in abstract. Unknown whether findings relate to clinical outcomes or language abilities. Limited to school-age children, generalizability to other ages unclear.

Children with autism often show atypical brain lateralization for speech and language processing, however, it is unclear what linguistic component contributes to this phenomenon. Here we measured event-related potential (ERP) responses in 21 school-age autistic children and 25 age-matched neurotypical (NT) peers during listening to word-level prosodic stimuli. We found that both groups displayed larger late negative response (LNR) amplitude to native prosody than to nonnative prosody; however, unlike the NT group exhibiting left-lateralized LNR distinction of prosodic phonology, the autism group showed no evidence of LNR lateralization. Moreover, in both groups, the LNR effects were only present for prosodic phonology but not for phoneme-free prosodic acoustics.

These results extended the findings of inadequate neural specialization for language in autism to sub-lexical prosodic structures.