Reward versus nonreward in simultaneous discrimination.

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Abstract
The procedure of a 2-choice discrimination was varied in 2 ways. Under M+ conditions, 60 rats were trained on problems in which S+ varied from trial to trial while the same S- was presented on every trial. Under M- conditions, 60 additional rats were trained on problems in which S- varied from trial to trial while the same S+ was presented on every trial. Performance was poorer under the M+ condition than under the M- condition, indicating that reward for choices of a specific S+ was a more critical determinant of discriminative performance than was nonreward for choices of a specific S-.

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