A Developmental Perspective of Global and Local Visual Perception in Autism Spectrum Disorder.
Local processing bias in autism creates steady interference on global tasks that does not lessen with age.
01Research in Context
What this study did
Guy et al. (2019) compared how kids and teens with autism see the big picture versus tiny details.
They used a quasi-experimental design with both autistic and neurotypical participants.
The task measured how much small details interfered when the kids tried to see the whole image.
What they found
Autistic children and teens showed much stronger local-to-global interference than their peers.
This detail-first pattern stayed the same from childhood through adolescence.
Age did not make the interference weaker or stronger.
How this fits with other research
Huang et al. (2025) pooled 15 brain-scan studies and found autistic brains light up the visual cortex while neurotypical brains use parietal areas for the same tasks.
This neuroimaging synthesis includes the 2019 behavioral data, showing the brain basis of the interference effect.
Redquest et al. (2021) extended the idea by showing this local bias also hurts memory: autistic kids confuse similar pictures because they lock onto matching small parts.
Deruelle et al. (2004) saw the same local-first style earlier, but only with faces; Jacalyn shows the pattern holds for abstract shapes too.
Why it matters
You now know the local bias is stable across ages, so do not expect it to fade as clients grow.
Design tasks that either embrace detail focus or explicitly teach whole-image strategies.
Check that teaching materials do not have competing small details that will pull attention away from the main concept.
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02At a glance
03Original abstract
Individuals with autism spectrum disorder (ASD) demonstrate superior performances on visuo-spatial tasks emphasizing local information processing; however, findings from studies involving hierarchical stimuli are inconsistent. Wide age ranges and group means complicate their interpretability. Children and adolescents with and without ASD completed a Navon task wherein they identified global and local stimuli composed of either consistent or inconsistent letters. Trajectories of reaction time in global and local conditions were similar within and between groups when consistent and inconsistent stimuli were considered together, but the effect of local-to-global interference was significantly higher in participants with than without ASD. Age was not a significant predictor of local-to-global interference, suggesting that this effect emerges in childhood and persists throughout adolescence in ASD.
Journal of autism and developmental disorders, 2019 · doi:10.1080/13546800701417096