Crowding and visual search in high functioning adults with autism spectrum disorder

Constable, Paul A. · 2010 · OpenAlex-citations

DOI: 10.2147/opto.s11476

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Summary

This study investigates whether reduced susceptibility to visual crowding explains the superior visual search performance often observed in individuals with autism spectrum disorder (ASD). Previous research indicated that children with ASD exhibit faster reaction times in visual search tasks, potentially due to enhanced local feature discrimination and a weaker influence of surrounding distractors (crowding). The authors sought to determine if this mechanism persists in high-functioning adults with ASD, addressing a gap in the literature regarding older populations and the stability of these perceptual traits over time. The researchers recruited 16 adults with ASD and 16 typically developing controls, matched for age, gender, and intelligence quotients. The study employed two primary experimental paradigms. First, a crowding task measured the critical spacing required for participants to correctly identify the orientation of a peripheral ellipse flanked by two circles, aiming to assess susceptibility to visual crowding. Second, a visual search task replicated previous methodologies by measuring reaction times, accuracy, and set-size slopes (indicating search efficiency) and intercepts (indicating pre-attentive processing speed) as the number of distractors increased. The results revealed no significant differences between the ASD and control groups in critical spacing for crowded ellipses or in elliptical discrimination thresholds. Furthermore, there were no significant group differences in reaction times, accuracy, or set-size slopes during the visual search task. However, the intercept for the set-size slope function was significantly lower for the comparison group, contrary to the hypothesis that ASD individuals would demonstrate faster early perceptual processing. Consequently, the study failed to replicate the superior visual search performance previously reported in younger ASD populations. The authors conclude that high-functioning adults with ASD do not demonstrate immunity to visual crowding nor an advantage in visual search tasks. These findings suggest that the enhanced discrimination and superior search abilities often attributed to ASD may not be persistent features of the disorder, potentially diminishing with age. The results challenge the assumption that local processing superiority is a stable, defining characteristic of ASD visual perception across the lifespan, indicating that developmental factors may play a significant role in these perceptual differences.

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• visual search