A profile of prosodic speech differences in individuals with autism spectrum disorder and first-degree relatives.
Shivani P Patel, Emily Landau, Gary E Martin and 4 others
PMID 36804204WHAT IT FOUND
Autistic adults and their parents showed subtle expressive prosody differences, particularly with stress and imitation, despite good receptive understanding.
These traits track with symptom severity and social personality features, suggesting prosody is a genetically linked marker rather than just a downstream effect.
Key findings
01Autistic individuals and their parents both showed reduced accuracy in imitating prosody and expressing lexical and contrastive stress compared to controls.
02In the combined child groups, greater autism symptom severity was associated with poorer prosodic imitation and stress expression, as well as increased pitch variability.
03Acoustic measures of pitch variability were associated with pragmatic language violations in both autistic individuals and their parents, linking prosody to social communication outcomes.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used a case-control design, so it cannot establish causality or determine if prosodic differences are a cause or consequence of social communication difficulties. Not all participants completed every PEPS-C subtest due to time constraints, leading to varying sample sizes across analyses. The correlations between prosody and clinical measures did not withstand Bonferroni correction for multiple comparisons, so some associations should be viewed as exploratory. The PEPS-C is a structured task, so findings may not fully generalize to naturalistic conversation. The sample was limited to individuals with adequate cognitive and language abilities, so results may not apply to those with more severe impairments.
Declared interests
The authors declared no conflicts of interest. The study was supported by NIH grants and US Government funds.
The easy way to misread this
Do not assume that acoustic pitch variability directly causes the perceptual prosodic differences observed by listeners. The study found inconsistent mapping between acoustic measures and listener ratings, suggesting that perceived prosodic issues may arise from a complex combination of features not fully captured by simple pitch metrics.