Working memory and executive function profiles of individuals with borderline intellectual functioning.
Visuo-spatial working memory and card-sorting are the fastest ways to spot borderline intellectual functioning in assessment.
01Research in Context
What this study did
The team looked at working memory and executive function in adults with borderline intellectual functioning. They used lab tasks, not IQ tests, to find the clearest weak spots.
Borderline IQ means IQ scores between 70 and 85. The study wanted to know which tasks best separate this group from typical adults.
What they found
Visuo-spatial working memory and a card-sorting task stood out as the strongest red flags. These two tasks spotted BIF better than any other measure.
Overall, the BIF group showed wide deficits in both working memory and executive function.
How this fits with other research
Pulina et al. (2019) later saw the same working-memory dip in school kids using the WISC-IV. Their data extend these adult findings downward to elementary and middle-school ages.
Vugs et al. (2013) meta-analysis found medium-sized visuo-spatial deficits in children with specific language impairment. That overlap warns us: poor visuo-spatial memory is not unique to BIF; it shows up across several low-IQ groups.
Barrett et al. (2015) add a twist in Williams syndrome: spatial memory fails only when items appear all at once, not one by one. The BIF paper did not test format, so keep this in mind when you pick your tool.
Why it matters
Add a quick visuo-spatial memory probe and a simple card-sort to your assessment kit. These two tasks take under ten minutes and clearly flag BIF. Because visuo-spatial weakness also appears in SLI and some genetic syndromes, never rely on a single score. Use the pattern, plus language and adaptive checks, to decide if support needs stem from BIF, language issues, or both.
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02At a glance
03Original abstract
BACKGROUND: The aim of the present study was to investigate the following issues: (1) Do students with borderline intellectual functioning have a pervasive pattern of impaired working memory skills across both verbal and visuo-spatial domains? (2) Is there evidence for impairment in executive function skills, and which tasks indicate greater deficits? and (3) Which executive function tasks can effectively identify students with low IQ from typically developing peers? METHOD: Students with borderline intellectual functioning (low-IQ; IQ standard scores were between 70 and 85) were age-matched with typically developing students (IQ standard scores >95). They were administered a range of working memory and executive function measures. RESULTS: The results show that students with low IQ have pervasive working memory and executive function deficits. Specifically, visuo-spatial working memory and the Sorting task were the best single predictors that reliably classified students with low IQ. CONCLUSIONS: Implications for education are discussed in the context of appropriate diagnosis and support in the classroom.
Journal of intellectual disability research : JIDR, 2010 · doi:10.1111/j.1365-2788.2010.01281.x