| Abstract: | Discrimination training in which introduction of S waspreceded by 250 S + trials resulted in errorless learning inrats trained to discriminate between two odors or tones versuslights, but not in those trained to discriminate between twolights or two tones. In a second study rats were trained todiscriminate odor, lights, or lights versus tones and then givena series of 10 successive discrimination reversals. Only ratstrained with odors showed positive transfer on the first reversaland acquisition of a learning-set. These results, together withthose of others, indicate that rats show exceptionally rapidacquisition of operant discriminations when trained with odorsand that this performance superiority is probably because odorsprovide more salient cues than do tones or lights. |
