Abstract
Domestic chicks were exposed to a moving, stuffed jungle fowl or a rotating red box. The effects on the imprinting process of lesions to a restricted part of the hyperstriatum ventrale (IMHV) were studied in a series of experiments. Sham-operated control chicks developed a strong preference for the training object. Damage to IMHV impaired chicks' preferences for the training stimulus. However, the effect on chicks exposed to the red box was profound, whereas the effect on chicks exposed to the jungle fowl was relatively weak. The results suggest that information about a complex object, which in the experiments described resembled the chicks' own species, is stored in a different way from information derived from a relatively simple artificial object.
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