Neuropsychological divergence of high-level autism and severe dyslexia.
High-functioning autism and severe dyslexia show distinct neuropsychological profiles—use problem-solving vs digit-span tasks to help differentiate.
01Research in Context
What this study did
The team gave neuropsych tests to two groups: high-functioning autism and severe dyslexia. They wanted to see if the two conditions leave different cognitive fingerprints. Tasks covered problem solving, memory, and attention.
What they found
The autistic group struggled most with problem-solving tasks. The dyslexic group showed a shorter digit span. The pattern suggests each diagnosis has its own cognitive signature.
How this fits with other research
Demopoulos et al. (2013) later found a similar split between autism and ADHD on social-cognitive tests. Matson et al. (2013) echoed the method by showing autism and 22q11DS also part ways on visual attention during emotion tasks. Together, the studies build a rule: give two clinical groups the same test and look for different error patterns.
Caçola et al. (2017) reviewed eleven autism vs. DCD papers and saw more differences than overlaps, backing the same idea. The 1990 paper started this line by proving dyslexia and autism can be told apart with the right task.
Why it matters
When a child lands on your caseload with a mixed file, run brief problem-solving and digit-span probes. A flat problem-solving score plus fair digit span leans toward autism; the reverse leans toward dyslexia. The quick contrast can steer your assessment plan and save hours of broad testing.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Add a two-minute digit-span check and a five-minute problem-solving puzzle to your intake kit; note which score is lower to flag the likely track.
02At a glance
03Original abstract
The relationship between cognitive deficits in high-level autism and those in learning disabilities has received little attention. To determine whether high-functioning autistic patients and individuals with severe dyslexia display different cognitive characteristics, 10 nonretarded men (mean age 26 years) with infantile autism, residual state, were compared with 15 severely dyslexic men (mean age 22 years) and 25 matched controls on a neuropsychological test battery. The two clinical groups were dissociated by a reduced digit span seen in the dyslexics and by impaired problem-solving skills (Wisconsin Card Sort and selected subtests from the Binet) seen in the autistic group. These results suggest different localization of brain dysfunction and different educational/habilitative needs.
Journal of autism and developmental disorders, 1990 · doi:10.1007/BF02284715