There was an error in the Method Section (p. 850) in the description of the number of trials in the dimensional change card sort (DCCS) task, which is reprinted herein. The task included six preswitch cards (three blue trucks and three red stars) and six postswitch cards (three blue trucks and three red stars), which was reported as eight cards in the original paper. This error has no implications for the analysis or the reported results, because the data were presented as a percentage of correct trials passed by each participant. This percentage was calculated on the six trials. We regret these errors and any problems they may have caused.
In the first test phase (preswitch) participants were asked to sort six cards according to one dimension (e.g., color), and in the second testing phase (postswitch) they were asked to sort the cards again according to the other dimension (e.g., shape).