Core language skill stable from infancy to adolescence
Marc H. Bornstein, Ph.D., from the National Institutes of Health in Bethesda, Maryland, and colleagues examined two types of stability of core language skill in 5,036 typically developing and 1,056 atypically developing children (preterm, dyslexic, autistic, and hearing-impaired) using 15-year prospective longitudinal data from the Avon Longitudinal Study of Parents. At multiple ages, a single core language skill was extracted from multiple measures.
The researchers found that in all groups, the core language skill proved stable from infancy to adolescence, even after they accounted for child nonverbal intelligence and sociability and maternal age and education. They noted these results indicate that addressing delayed language skills early in development is beneficial.
"The fact that stability of core language skill across so long a period began so early, was sustained so long, transcended several heterogeneous moderating factors, and was maintained over and above covariates points to a highly conserved and robust individual-differences characteristic in human beings," the authors write. "It further suggests that the search for mechanism(s) underlying stability of core language skill in children is likely to reward basic science as well as applied clinical research."
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