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To determine the effects of amytal and affective stimuli on the conceptual thinking of three groups of psychiatric patients, the authors utilized an object-sorting test. The impairment in conceptual thinking of schizophrenic patients was not altered by either of these influences separately, but was increased by both in combination. Conceptual functioning was impaired in depressive patients by either influence. In neurotics, amytal ordinarily facilitated conceptual thinking, but impaired it during affective stimulation.