Summary
Removal of the cerebral hemispheres, including the corpora striata, in young chicks has a marked effect on their subsequent conditioned reflex activity. The stability and regularity of the conditioned reflexes is reduced, and differentiation of the visual and of the auditory conditioned signals deteriorates. Removal of the rudimentary cortical areas in young chicks has little effect on their subsequent reflex activity, and does not affect accurate visual or auditory differentiation. Disturbances of visual and auditory analysis caused by injury to the corpora striata are found also in adult hens, but do not occur when only the rudimentary cortical areas are destroyed. Cortical areas removed from young chicks regenerate, while there is no recovery from damage to the corpora striata.
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Panomareva, O.E. The effect of early partial decortication on visual and auditory conditioned reflexes in chickens. Bull Exp Biol Med 48, 1330–1337 (1959). https://doi.org/10.1007/BF00788342
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DOI: https://doi.org/10.1007/BF00788342