A comparison of local-global visuospatial processing in autism spectrum disorder, nonverbal learning disability, ADHD and typical development.
A quick local-global drawing index helps you spot non-verbal learning disability and ADHD while ruling out autism.
01Research in Context
What this study did
The team gave visuospatial tasks to four groups: autism, ADHD, non-verbal learning disability, and typically developing kids.
They looked at how each group handled local details and the overall picture. Then they built a simple local-global index to see if it could tell the groups apart.
What they found
Kids with non-verbal learning disability struggled on every visuospatial task.
ADHD kids were slow but accurate. Autism and typical kids scored about the same.
The local-global index cleanly split the groups on a drawing task, making it a quick red-flag tool.
How this fits with other research
Cantio et al. (2016) said local processing bias is rare in high-functioning autism and not useful for diagnosis. The new study seems to disagree, but the earlier paper only compared autism to typical kids and left out ADHD and NLD. Once those groups are in the mix, the local-global gap reappears.
Hatton et al. (2005) first showed that spatial working memory is weaker in both autism and ADHD. Ramona et al. now widen the lens, showing the two diagnoses diverge on broader visuospatial tasks.
Amorim et al. (2025) extend the cross-diagnostic idea into social cognition, finding that traits matter more than labels. The visuospatial index joins that theme: numbers, not names, flag who needs help.
Why it matters
You can add a five-minute local-global drawing task to your intake battery. A low score points toward non-verbal learning disability or ADHD, not autism. That means faster referrals and fewer mislabels. Use it especially when a child’s verbal scores mask visual-construction problems.
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02At a glance
03Original abstract
BACKGROUND: Research on visuospatial functioning has revealed cognitive challenges for children with autism spectrum disorder (ASD), nonverbal learning disability (NLD) and attention deficit hyperactivity disorder (ADHD). These disorders are characterized by some overlapping symptoms, making their diagnosis a challenge. AIMS: The study aims to clarify the role of visuospatial abilities in their neuropsychological profiles by investigating different visuospatial domains and their interplay with the local-global processing. METHOD AND PROCEDURES: Participants (N = 150) with ASD, NLD, or ADHD were compared with typically-developing (TD) children on visuospatial processing speed, visuo-perceptual abilities, visuo-constructive abilities, and visuospatial working memory. Generalized mixed-effects models were performed and receiver operating characteristic curves were estimated to express the usefulness of a local-global processing index in discriminating groups. OUTCOMES AND RESULTS: The NLD group was impaired in all domains; children with ADHD revealed a heterogeneous profile, with greater impairments in visuospatial processing speed; ASD and TD groups were comparable. The local-global processing index had predictive power in discriminating among groups in visuo-constructive task. CONCLUSIONS AND IMPLICATIONS: The study of visuospatial abilities of children with ASD, NLD and ADHD might help to understand strengths and weaknesses in their neuropsychological profile and to differentiate between them. Clinical implications of these findings are discussed.
Research in developmental disabilities, 2020 · doi:10.1016/j.ridd.2020.103682