ABSTRACT
There are types of learning, especially in man, that appear to involve more than a simple linkage between sensory perception and motor performance. An important affective component has been added which appears to serve a function in the acquisition of the learned behavior, to be associated in its retrieval, and to guide its performance … [In] an interesting experiment … Ivanitskii … conditioned rabbit pups for the first five days of life to lift their heads in response to an odor presented during suckling. Then, after five days without this olfactory stimulus, during which the pups acquired their normal patterns of locomotion, the odor was again presented. Now, instead of merely lifting their heads, they ran toward it in a behavioral response that had never been coupled with the odor before. Obviously what had been learned was not a performance but an affective association (or, if you will, an appetitive drive).
