Meta-analysis of neuropsychological measures of executive functioning in children and adolescents with high-functioning autism spectrum disorder.
Kids with HFASD show reliable, moderate deficits across most executive functions, and the gap is autism-specific, not just ADHD overlap.
01Research in Context
What this study did
Lai et al. (2017) pooled every paper they could find on executive function tests in kids and teens with high-functioning autism.
They looked at planning, flexible thinking, working memory, and self-control tasks like the Tower of Hanoi or Wisconsin Card Sort.
The team then averaged the scores to see how far behind the HFASD group was compared to typical peers.
What they found
Across all studies, kids with HFASD scored about half a standard deviation lower on most executive tests.
The gap stayed the same even when kids with ADHD were removed, showing the problem is part of autism, not just attention issues.
Planning and flexibility were the weakest spots; simple reaction time was less affected.
How this fits with other research
Narzisi et al. (2013) saw the same wide EF dip using the NEPSY-II, so the new meta-analysis confirms their early map.
Valeri et al. (2020) push the timeline younger: Italian preschoolers with ASD already show inhibition and shifting problems, matching the school-age pattern.
Barnard et al. (2008) looks like a contradiction: adults with autism plus learning disability only had working-memory and planning deficits, not broad EF problems. The difference is IQ: their group had ID, so floor effects may hide smaller gaps.
Why it matters
You can stop blaming "attention problems" for every EF stumble in HFASD. Plan goals that explicitly teach planning and set-shifting, not just attention cues. Break long tasks into visible steps, use checklists, and pre-teach rule changes before they happen. These supports target the core autism profile, not a co-occurring ADHD label.
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02At a glance
03Original abstract
Existing literature on the profile of executive dysfunction in autism spectrum disorder showed inconsistent results. Age, comorbid attention-deficit/hyperactivity disorder (ADHD) and cognitive abilities appeared to play a role in confounding the picture. Previous meta-analyses have focused on a few components of executive functions. This meta-analysis attempted to delineate the profile of deficit in several components of executive functioning in children and adolescents with high-functioning autism spectrum disorder (HFASD). Ninety-eight English published case-control studies comparing children and adolescents with HFASD with typically developing controls using well-known neuropsychological measures to assess executive functions were included. Results showed that children and adolescents with HFASD were moderately impaired in verbal working memory (g = 0.67), spatial working memory (g = 0.58), flexibility (g = 0.59), planning (g = 0.62), and generativity (g = 0.60) except for inhibition (g = 0.41). Subgroup analysis showed that impairments were still significant for flexibility (g = 0.57-0.61), generativity (g = 0.52-0.68), and working memory (g = 0.49-0.56) in a sample of autism spectrum disorder (ASD) subjects without comorbid ADHD or when the cognitive abilities of the ASD group and the control group were comparable. This meta-analysis confirmed the presence of executive dysfunction in children and adolescents with HFASD. These deficits are not solely accounted for by the effect of comorbid ADHD and the general cognitive abilities. Our results support the executive dysfunction hypothesis and contribute to the clinical understanding and possible development of interventions to alleviate these deficits in children and adolescents with HFASD. Autism Res 2017, 10: 911-939. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
Autism research : official journal of the International Society for Autism Research, 2017 · doi:10.1002/aur.1723