Neuropsychological predictors of everyday functioning in adults with intellectual disabilities.
Verbal memory, comprehension, and having a job—not IQ—forecast daily living skills in adults with ID.
01Research in Context
What this study did
Su et al. (2008) tested the adults with mild to moderate intellectual disability. They gave each person a short battery of memory, language, and problem-solving tests.
The team also asked about jobs, day programs, and living situation. They wanted to know which test scores best predicted real-life skills like cooking, shopping, and self-care.
What they found
Two things mattered most: verbal memory plus understanding spoken instructions, and whether the person had a paid job. Together these explained a large share of the differences in everyday living scores.
Full-scale IQ scores added almost nothing once those two pieces were known. Employment status alone gave a bigger boost than any single test.
How this fits with other research
Berkovits et al. (2014) later showed that a frailty index predicts later ADL decline in older adults with ID. C-Y’s work extends that idea: cognitive plus social factors forecast function at any age.
Romanowich et al. (2010) found that executive function, not IQ, drives decision-making tasks. C-Y agree—verbal memory, not global IQ, drives daily living skills. The papers line up: narrow skills beat full scores.
Faso et al. (2016) warn that IQ and adaptive behavior are separate constructs. C-Y’s data support this; IQ dropped out once verbal memory and job status entered the model.
Why it matters
Stop using full-scale IQ as your main guide. Instead, screen verbal memory and comprehension with quick list-learning or story-retell tasks. Add a vocational question: “Does this person have a paid job?” If the answer is no, weave job-site trials into the plan. These two data points give you a fast, evidence-based snapshot of how much independence to expect and where to place supports.
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02At a glance
03Original abstract
BACKGROUND: Very little is known about the neuropsychological correlates of adaptive functioning in people with intellectual disabilities (ID). This study examined whether specific cognitive deficits and demographic variables predicted everyday functioning in adults with ID. METHOD: People with ID (n = 101; ages 19-41 years; mean education = 11 years; 34% women; 54% competitively employed; 41% with mild ID) completed a comprehensive neuropsychological battery grouped into four cognitive domains: processing speed, verbal memory and comprehension, visual perception/constructive function, and executive function. In addition, parents completed an 89-item rating scale developed to assess a wide range of independent living skills. RESULTS: Confirmatory factor analysis results confirmed a correlated four-factor model of cognitive function and a unidimensional model of everyday functioning. Furthermore, structural equation modelling results supported the predictive relationship of verbal memory/comprehension and employment status (standardized regression coefficients 0.45, 0.22, P < or = 0.01 for each) to measures of everyday functioning. The two variables together explained 35% of the variance in everyday functioning. CONCLUSIONS: Both general cognitive dysfunction and specific verbal memory and comprehension deficit impair daily functions in people with ID. These findings have implications for predictive models of adaptive functioning, and for cognitive rehabilitation and deficit compensation strategies for this group.
Journal of intellectual disability research : JIDR, 2008 · doi:10.1111/j.1365-2788.2007.00969.x