Abstract
Two-week-old Gallus chicks after lesion of the dorsal midline hyperstriatum accessorium are less easily distracted by novelty from the performance of a trained runway response than those with more lateral or posterior hyperstriatal damage or sham-operated controls. With dorsal midline hyperstriatal lesions, chicks also show delayed acquisition of a passive-avoidance task and an impaired response pattern on a delayed-response task compared to controls. The apparent continuation of the trained responding characteristic of chicks with these lesions when experimental contingencies change is tentatively compared with the behavior of mammals with limbic lesions.
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