Brief report: performance pattern differences between children with autism spectrum disorders and attention deficit-hyperactivity disorder on measures of verbal intelligence.
Autism often prints a clear Similarities > Vocabulary > Comprehension slide on WISC-IV—use that pattern as a fast triage tool.
01Research in Context
What this study did
The team gave the WISC-IV verbal subtests to kids with autism and to kids with ADHD.
They looked at how each group scored on Similarities, Vocabulary, and Comprehension.
The goal was to see if the two diagnoses leave different "fingerprints" on the test.
What they found
Children with autism slid down the three subtests in order: Similarities strongest, Vocabulary lower, Comprehension lowest.
Children with ADHD did not show this tidy step-down pattern.
The pattern could help clinicians decide which label to explore first.
How this fits with other research
Coolican et al. (2008) saw the same nonverbal-over-verbal tilt in autism using the Stanford-Binet, so the WISC-IV pattern is not a one-off.
Cramm et al. (2009) found that kids whose nonverbal tops verbal also lack inner speech; Maya’s step-down fits that group, hinting the weak Comprehension score may flag absent self-talk.
Mundy et al. (2016) compared autism and ADHD too, but on memory during joint attention. Their paper and this one together show the two diagnoses differ in both social-cognitive and verbal domains, strengthening the case for separate assessment tracks.
Why it matters
If you test a child and see Similarities > Vocabulary > Comprehension, think autism first. Pair this red flag with social and repetitive-behavior data before you consider ADHD. The quick check can shorten the road to the right referral and save re-testing later.
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Join Free →After you score any WISC-IV, jot the three verbal scaled scores in order; if they drop like stairs, add autism-specific social probes to your assessment plan.
02At a glance
03Original abstract
Performance patterns on verbal subtests from the WISC-IV were compared between a clinically-referred sample of children with either autism spectrum disorders (ASD) or attention deficit/hyperactivity disorder (ADHD). Children with ASD demonstrated a statistically significant stepwise pattern where performance on Similarities was best, followed by Vocabulary, then Comprehension. Although children with ASD and ADHD share multiple behavioral features, this pattern was not observed for those with ADHD. Greater deficits in social reasoning and verbal formulation for children with ASD (compared to ADHD) are hypothesized to account for this observed difference in their performance pattern. Clinical implications, including use of this identified pattern in combination with other symptoms suggestive of ASD in referral decision making are discussed.
Journal of autism and developmental disorders, 2011 · doi:10.1007/s10803-011-1207-z