3 groups of Ss performed a 2-display discrimination task in which reinforcement depended upon identification of the new stimulus during each trial. The 3 groups were composed of equated samples of brain-damaged patients, hospitalized patients with lower limb amputations, and nonhospitalized normal geriatric males. Results showed that the normal group differed significantly from the brain-injured and nonhospitalized groups in ability to solve the task, with the former showing learning effects and the latter apparently responding on a random basis.
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