The structure, profile, and diagnostic significance of intelligence in children with ADHD are impressively similar to those of children with a specific learning disorder.
WISC-IV profiles can’t tell ADHD apart from specific learning disorders—use additional assessments for differential diagnosis.
01Research in Context
What this study did
The team gave 6- to young learners the WISC-IV. They compared three groups: ADHD, specific learning disorder (SLD), and neurotypical kids.
They looked at every sub-test score and asked, "Do the shapes of these profiles look different?"
What they found
ADHD and SLD profiles were almost identical. The test could flag kids who are not typical, but it could not tell ADHD apart from SLD.
In short, a low score or a flat profile does not point to one label over the other.
How this fits with other research
Ingadottir et al. (2025) extends this idea. They showed that kids with ADHD plus autism score a bit higher on perceptual reasoning than kids with ADHD alone. Both studies warn that WISC-style scores overlap across labels.
Laposa et al. (2017) found the same dead end with working-memory tests. Like the WISC-IV, memory scores tracked attention problems on a sliding scale but never gave a yes/no ADHD answer.
Moss et al. (2009) seems to disagree at first. Their CSI-4 parent form cleanly split ADHD from autism. The key difference is the rival: J et al. compared ADHD to ASD, while Enrico et al. compared ADHD to SLD. Different rivals, different outcomes.
Why it matters
If you test a child for ADHD, do not stop at the WISC-IV. Add rating scales, observations, and history. When the scores look flat or low, think "learning issue" rather than jumping to one diagnosis. Use the profile to plan supports, not to pick a label.
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02At a glance
03Original abstract
This study examines the structure, profile, and diagnostic significance of intelligence in a group of 948 children diagnosed with attention deficit/hyperactivity disorder (ADHD) assessed with the WISC-IV and compared with children with specific learning disorders (SLDs) and with typically developing children. Based on four indexes, the WISC-IV configuration found in TD resulted applicable to ADHD, but with generally lower loadings on g. The Perceptual Reasoning and Verbal Comprehension indexes not only had higher loadings compared to the other two indexes but also represented the relative strengths of children with ADHD, as previously observed for children with SLD. In fact, the WISC pattern could be successfully used for discriminating between ADHD and TD, but not between ADHD and SLD. The latter result was not due to a co-occurrence of a learning disorder because the presence or absence of an associated diagnosis of SLD negligibly affected the pattern observed in ADHD. We concluded that the characteristics of intelligence in children with ADHD can be relevant for assessing this disorder, and that ADHD and SLDs share largely similar underlying cognitive features.
Research in developmental disabilities, 2022 · doi:10.1016/j.ridd.2022.104306