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Existing research in dyslexia has emphasized perceptual tasks and supervised categorization tasks (for which intact attentional processes are paramount), but there have been no studies on unsupervised categorization. Our investigation was based on Pothos and Chater's (<jats:italic>Cognit. Sci.<\/jats:italic>, 2002; 26: 303\u2013343) model of unsupervised categorization and the corresponding methodology for analysing results. Across all performance indices and various data\u2010processing options, we could identify no difference between dyslexic and non\u2010dyslexic participants. 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