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Global and local visual processing in autism - a co-twin-control study
J Neufeld1, A Hagström1, A Van't Westeinde1,2
1Center of Neurodevelopmental Disorders (KIND), Centre for Psychiatry Research, Department of Women's and Children's Health, Karolinska Institutet, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Summary
Autism Spectrum Disorder (ASD) is linked to difficulties in global visual processing, suggesting a "weak central coherence." Findings in twins indicate a non-shared environmental influence on these visual processing differences.
Area of Science:
- Neuroscience
- Developmental Psychology
- Visual Perception
Background:
- Autism Spectrum Disorder (ASD) is characterized by altered visual processing, but findings on global vs. local processing remain debated.
- Theories include "weak central coherence" (WCC), suggesting reduced global integration, and enhanced perceptual functioning (EPF) in local processing.
- Contradictory evidence necessitates further investigation into the specific nature of visual processing alterations in ASD.
Purpose of the Study:
- To investigate the association between Autism Spectrum Disorder (ASD) and global/local visual processing.
- To differentiate between WCC and EPF accounts of visual processing in ASD.
- To explore genetic and environmental contributions using a twin study design.
Main Methods:
- Utilized a large twin cohort (N=290, ages 8-31) with monozygotic (MZ) and dizygotic (DZ) twins.
- Assessed global processing via the Fragmented Pictures Test (FPT).
- Measured local processing using the Embedded Figures Test (EFT) and Block Design Test (BDT).
- Evaluated autism categorically (diagnosis) and dimensionally (autistic traits).
- Analyzed associations across the cohort and within-pair analyses to control for shared factors.
Main Results:
- ASD and autistic traits correlated with a greater need for visual information in FPT (global processing) across the cohort.
- This association for clinical diagnosis remained significant within-pair and trended within MZ twin pairs.
- Higher autistic traits and ASD diagnosis predicted lower performance on EFT and BDT (local processing) across the cohort, but these effects diminished within-pair.
- No evidence for enhanced perceptual functioning (EPF) in local processing was found.
Conclusions:
- Findings support the WCC account, linking autism to reduced global visual processing in children, adolescents, and young adults.
- The observed association within MZ twins suggests a significant non-shared environmental contribution to these visual processing differences.
- No evidence was found to support the EPF theory in the context of local visual processing in ASD.
Keywords:
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