Enhanced discrimination in autism

Michelle O’Riordan; Plaisted, Kate · 2001 · OpenAlex-citations

DOI: 10.1080/713756000

archive: archived pipeline: cataloged verified

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Summary

This study investigates the cognitive mechanisms underlying the superior visual search performance observed in children with autism compared to typically developing children. While previous research established that individuals with autism excel at detecting targets among distractors, the specific cause of this advantage remained unclear. The authors sought to determine whether the critical determinant of search rate in children is the discriminability of display items, as it is in adults, and whether the enhanced performance in autism stems from an improved ability to discriminate between these items. The study tests two competing theoretical frameworks: Feature Integration Theory, which posits that serial attentional integration of features is the rate-limiting step, and discrimination models (guided search and stimulus similarity), which argue that target-distractor similarity drives search efficiency. The researchers conducted two experiments involving children with autism and typically developing controls, matched for chronological age and general cognitive ability using Raven’s Coloured Progressive Matrices. Experiment 1 utilized double and triple conjunctive search tasks where targets were defined by combinations of color, size, and orientation. The design manipulated the number of features shared between targets and distractors to vary discriminability while controlling for integration complexity. Experiment 2 employed conjunctive search tasks using letters, manipulating similarity within specific dimensions (color and form) to further test the discrimination hypothesis. Participants performed visual search tasks across varying display sizes, with reaction times and error rates recorded. The results demonstrated that discriminability, rather than feature integration, is the rate-determining factor for visual search in both children with and without autism, replicating findings from adult populations. Specifically, search performance improved when targets were more distinct from distractors, regardless of the number of features requiring integration. Crucially, children with autism exhibited significantly faster reaction times than controls in tasks with high target-distractor similarity. In Experiment 2, although both groups were slowed by increased similarity, the children with autism were significantly less affected by this increase than the control group. Error rates were comparable between groups, indicating that the speed advantage did not reflect a speed-accuracy trade-off. These findings conclude that individuals with autism possess an enhanced ability to discriminate between visual display items, which underlies their superior performance in visual search tasks. This evidence supports discrimination models of visual search and contradicts theories proposing a fundamental impairment in perceptual integration in autism. The study suggests that the visual processing advantage in autism is specific to the parallel processing stage of discrimination, rather than a deficit in serial attentional integration.

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• visual search