Spence's theory anticipated the discovery of the peak shift phenomenon.

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Spence's theory proposed that stimuli that deviate from the average tend to be more salient and elicit stronger responses. This concept is related to the peak shift phenomenon, which was discovered after Spence's theory and describes how animals may respond more strongly to stimuli that are farther from the average, or peak, of the stimuli they have been trained to respond to. Therefore, Spence's theory can be seen as anticipating the discovery of the peak shift phenomenon.

Spence's Theory Anticipated the Discovery of the Peak Shift Phenomenon