The Wisconsin Card Sort Task requires participants to sort stimulus cards that differ in dimensions (shape, colour, or number). However, they are not told how to sort them. The only feedback they receive is whether or not a match is correct. Participants must discover the rule according to dimension. Once the participant matches a certain number of correct cards, the dimension changes and they must rediscover the new rule. This requires participants to remember the rule they were using and cognitively change the rule by which they use to sort.