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Performance on the standard (ie, A'B'C'D') and variant (E'F'G'H') versions of the IGT. Performance represents the number of cards chosen from the advantageous decks minus the number of cards chosen from the disadvantageous decks for each block of 10 trials averaged across all 10 blocks. Higher scores indicate better performance. There were no group differences on the standard version of the task, but the difference on the variant was significant. Error bars=standard error of the mean.
