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Comparison of the frequency of error trials between the Grouping and Difficult conditions. a, Averaged error rates in all trials. b, Averaged miss rate in AA′ (Grouping) or AA (Difficult) trials. c, Averaged false alarm rate in ABB′ (Grouping) or AA′A′ (Difficult) trials. d, Averaged fixation break rates. Only monkey 1 contributed to this experiment (experiment 2). Error bars represent the SEM.
