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Wisconsin Card Sorting Task

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The Wisconsin Card Sorting Task is a frequently used neuropsychological test.

The examiner shows four cards with symbols that differ in number, shape, or color to the subject. The subject is given similar but not identical cards and asked to place an appropriate response card in front of the stimulus card. The examiner then responds either "right" or "wrong", using a set rule (must be the same color, or must be the same shape, for example) that he has not told the subject. Once the subject figures out the rule (indicated by getting 10 right answers in a row, not by verbal communication), the examiner changes the rule, without informing the subject. Repeat for a total of 6 different rules.

Reference

E. A. Berg. (1948). A simple objective technique for measuring flexibility in thinking J. Gen. Psychol. 39: 15-22.

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