The development of numerical magnitude processing and its association with working memory in children with mild intellectual disabilities.
Kids with mild ID have weaker number sense that memory training alone won’t fix.
01Research in Context
What this study did
Carmen and her team looked at kids with mild intellectual disability (MID).
They gave two kinds of number tasks: symbolic (digits) and non-symbolic (dot groups).
They also tested working memory to see if it explains the math gap.
A same-age group without MID took the same tests for comparison.
What they found
Kids with MID were slower and less accurate on both kinds of number tasks.
The gap stayed even after the researchers factored out working memory scores.
This means the number sense weakness is not just a memory problem.
How this fits with other research
Brankaer et al. (2011) saw the same delays two years earlier, but without memory controls.
The new study adds working memory checks and shows the delay is still there.
Schwenk et al. (2017) pooled many studies and found symbolic speed is the clearest red flag for math trouble.
That meta-result lines up with the MID data here.
Defever et al. (2013) looked at kids with math learning disability and blamed an access gap, not a core sense gap.
Carmen’s MID kids seem to have both access and core sense gaps, so the picture is more severe.
Why it matters
When you test a child with MID, check both symbolic and non-symbolic magnitude tasks.
Poor scores mean the child needs number sense work, not just memory support.
Pair small-digit drills with concrete sets of objects to bridge the symbol-to-quantity link.
Track progress on both types of tasks to be sure the gap is closing.
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02At a glance
03Original abstract
The present research examined numerical magnitude processing and its association with working memory in children with mild intellectual disabilities (MID). We investigated the performance of 8-year-old children with MID on a symbolic (Arabic digits) and non-symbolic (dot patterns) magnitude comparison task by means of a chronological-age/ability-level-match design. We also examined whether the predicted problems with numerical magnitude comparison could be explained by working memory by using three working memory tasks. Findings revealed that children with MID performed more poorly than their chronological age-matched peers on both the symbolic and non-symbolic magnitude comparison tasks, suggesting impairments in these children's ability to represent numerical magnitudes. They also performed more poorly on working memory compared to their typically developing age- and ability-matched peers, but when these differences in working memory performance were additionally controlled for, the group differences on the numerical magnitude comparison tasks remained. Both symbolic numerical magnitude processing and central executive functioning predicted addition performance in children with MID.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2013.07.001