Category Test
a nonverbal problem-solving task that requires abstract reasoning, concept formation, and mental flexibility. The participant is presented with six subtests each comprising a different set of stimuli organized according to a specific principle and each stimulus within each set being associated with a particular number. The participant must respond by choosing a number and, using feedback about response accuracy, determine the principle of organization underlying the set of stimuli within a particular subtest. Once the principle is correctly identified, the participant can solve each item correctly within the subtest. A final subtest contains items from the previous six. The Category Test is part of the Halstead–Reitan Neuropsychological Battery. Also called Halstead Category Test. [designed in 1947 by U.S. psychologist Ward C. Halstead (1908–1969)]