Language Subdomains in Children on the Autism Spectrum: Cross-Sectional Study of Morphologically Rich Language.
Klara Popčević, Jasmina Ivšac Pavliša, Gordana Hržica
PMID 41818406WHAT IT FOUND
When matched on vocabulary, children on the autism spectrum did not differ from typically developing children on grammar scores.
Vocabulary and grammar rose together in both groups, and vocabulary age was about 2 to 3 months ahead of morphology age.
Key findings
01When the autism and typically developing groups were matched on expressive vocabulary, they did not differ significantly on morphological or syntactic parent-report scores.
02Expressive vocabulary size was positively associated with sentence complexity, word forms, and morphemes in both groups.
03When scores were converted to equivalent ages, lexical age exceeded morphological age by about 2 to 3 months in both groups.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only verbal children with nonverbal cognitive scores in the normal to low-normal range, so it says little about minimally verbal children or those with intellectual disability. The groups were matched only on expressive vocabulary, not on chronological age, nonverbal IQ, mental age, or socioeconomic status, so differences in those factors may have affected the grammar comparisons. The autism group was older than the typical group, which makes it hard to separate the effect of vocabulary level from the effect of age. The study was cross-sectional and looked at one early vocabulary stage, so it cannot show how language profiles develop over time. Language scores came from parent report on the CDI, not from spontaneous speech samples or standardized direct assessments. Females were underrepresented, and the study did not analyse sex differences. The sample was Croatian-speaking, a morphologically rich language, so the pattern may not apply to languages with different grammar structures.
Declared interests
The authors declared no conflicts of interest, and the study had no sponsor or funder.
The easy way to misread this
Do not conclude that autism does not affect grammar. The comparison was limited to selected children with expressive vocabularies of 150 to 450 words and nonverbal cognitive scores in the normal to low-normal range, and the groups were matched only on vocabulary, not age or nonverbal IQ.
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