The relative difficulty of the number, form, and color concepts of a Weigl-type problem.

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Abstract
96 Ss sorted the cards in the Wisconsin Card Sorting Test with non-explicit instructions and rewards with respect to sorting categories. E indicated whether or not a given card was sorted correctly, and changed the "correct" principle each time 10 consecutive cards had been sorted according to this principle. Sorting could be by form, number, or color of figures on the card. "The results of this experiment showed that the Ss were able to sort selectively for number most easily and for form next most easily while sorting selectively for color was most difficult." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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