Vowel distinctiveness as a concurrent predictor of expressive language function in autistic children.
Paul J Simeone, Jordan R Green, Helen Tager-Flusberg and 1 others
PMID 38348589WHAT IT FOUND
In 27 autistic children, how distinct their vowel sounds were predicted expressive language skills, but only for those with limited speech.
For children with stronger language, understanding of speech was the better predictor. This acoustic measure helps identify which children may struggle to develop spoken words.
Key findings
01Vowel distinctiveness accounted for 29% of the variance in expressive language scores across the whole sample, with receptive language adding another 38%.
02When split by language ability, vowel distinctiveness was the sole significant predictor of expressive language for the low-language group, while receptive language was the sole predictor for the high-language group.
03Age did not add significant predictive value to the models, suggesting that for the low-language group, expressive language deficits are not simply due to being younger.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The sample was very small (27 children), and subgroups for the split analysis were tiny (14 and 13 participants). Only children who could produce at least three analyzable syllables were included. The 71 excluded children had significantly lower expressive language scores, so the findings do not apply to the most severely impaired minimally verbal children. Expressive language was measured by parent report (Vineland-3), which can be subjective, though it was highly correlated with an objective word-count measure. This was a concurrent analysis, not longitudinal. It shows a relationship at one point in time, not that vowel distinctiveness predicts future language growth.
Declared interests
The authors report no conflicts of interest. The study was supported by the NIH.
The easy way to misread this
Do not assume this acoustic measure works for all non-speaking or minimally verbal children. The study only included children who could already produce at least three syllables. The children who could not produce enough speech for analysis were excluded, and they had the lowest language scores. This method may not be applicable to the most severely impaired patients.