Unilateral memory after binocular discrimination training: left hemisphere dominance in the chick?

After learning a pattern discrimination with both eyes open, chicks demonstrated good monocular retention when tested through the right, but not the left, eye. Since the avian optic nerves cross completely to the contralateral hemisphere, the results suggest that the left hemisphere of the chick brain was dominant for pattern discrimination learning and that memory for the discrimination was stored as a unilateral engram which was not available to the right hemisphere.