An investigation into maternal use of telegraphic input to children with Down syndrome.
Emily Lorang, Courtney E Venker, Audra Sterling
PMID 31587679WHAT IT FOUND
Mothers of children with Down syndrome used fewer words and more telegraphic speech than mothers of age-matched typically developing children.
This observational study identifies input differences but does not prove which style helps or hinders language development.
Key findings
01Mothers of children with Down syndrome produced significantly fewer unique words (mean 280.18) than mothers of age-matched children with typical development (mean 313.27).
02Mothers of children with Down syndrome used significantly more telegraphic utterances (mean 10.00) than mothers of children with typical development (mean 7.50).
03In the Down syndrome group, maternal lexical diversity was positively correlated with child receptive language scores, but maternal telegraphic use showed no significant correlation with any child language measure.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study is cross-sectional, so it cannot determine if maternal input causes changes in child language or if child language influences maternal input. The sample size was small (22 per group), limiting the ability to detect subtle relationships or generalize to all children with Down syndrome. Telegraphic input was only measured over 21 minutes of interaction; its impact over a full day or week is unknown. The study did not include fathers or other caregivers, so it does not represent the full communication environment. No correction for multiple comparisons was applied to the correlation analyses, increasing the risk of false positive findings. The study did not measure whether parents were instructed to use telegraphic input by therapists, so the source of this behavior is unclear.
Declared interests
The authors declared no conflicts of interest. The study was supported by NIH grants.
The easy way to misread this
Do not interpret the higher use of telegraphic input by mothers of children with Down syndrome as evidence that it is harmful. The study found no significant correlation between telegraphic input and child language scores in this group, and the design cannot prove causation.