Abstract

Three experiments are described. The ability of chicks to discriminate shape or colored stimuli after being exposed to both discriminanda in an imprinting situation is compared with the discriminative ability of chicks not previously exposed. In two of the three experiments, we found no differences between the groups, although in the third, the group previously exposed to the discriminanda showed an impairment in discriminative ability. Our negative results are not in accordance with those of Bateson and Chantrey (1972), who attribute the learning impairment to a prior “classifying together” of the stimuli, a mechanism enabling the chick to respond to differing views of the imprinting object as representative of the same object.

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