A recent study investigated how specific nonverbal cognitive abilities relate to language outcomes in children with Developmental Language Disorder (DLD) - a condition where children experience significant language difficulties that cannot be explained by hearing loss, neurological damage, or other known factors. Researchers worked with 77 children aged roughly 7 to 10 years, comparing 54 language-typical children against 23 children with DLD. They measured four cognitive areas: nonverbal IQ, working memory, implicit statistical learning, and something called “speed of automatization” (how quickly and effortlessly a child can perform a learned task without having to consciously think about it). The findings revealed notable differences between the two groups across both language and cognitive measures, with the DLD group scoring lower on nonverbal IQ and working memory in particular. Interestingly, implicit statistical learning showed no reliable group differences, though the researchers acknowledge that measuring this ability in children remains technically challenging.
This study proposed a cumulative risk model, that rather than pointing to a single cognitive deficit as the root cause of DLD, the researchers suggest that it is the combination of weaknesses that increases a child’s likelihood of having DLD. Crucially, no child in the DLD group scored above average on all three cognitive measures, which is a striking pattern. On the flip side, having strengths in even one or two of these areas may act as a protective buffer, helping to partially compensate for difficulties elsewhere. So DLD is not simply a “language problem” in isolation, but is deeply intertwined with broader cognitive functioning.
From a practical standpoint, these findings carry meaningful implications for how we support children with DLD. If language and cognition are mutually reinforcing, then interventions that focus solely on language skills may be missing part of the picture. Supporting nonverbal cognitive development, particularly working memory and processing fluency, could meaningfully bolster a child’s language abilities over time. The researchers also note that a bidirectional relationship likely exists: poor language skills can, in turn, drag down cognitive development, creating a compounding disadvantage as children grow older. This underscores the urgency of early, holistic assessment and intervention - one that treats the child’s cognitive and linguistic profile as a whole, rather than addressing language in isolation.
Link to the full study: Redirecting