Watanabe S
Department of Psychology, Keio University, Tokyo, Japan.
Behav Brain Res. 1988 Aug;29(3):259-65. doi: 10.1016/0166-4328(88)90030-7.
Two groups of pigeons received a unilateral thalamic lesion in the hemisphere contralateral to the eye used for monocular training of a line orientation discrimination. The first group was trained monocularly on the discrimination after the lesion, and the second group received the lesion after the birds were successfully trained on the discrimination task. Then both groups were trained on the same task with their previously untrained eye to examine interocular transfer of discrimination. Lesion in the nucleus rotundus before monocular discrimination retarded acquisition of the original monocular learning but did not cause deficits in interocular transfer, whereas the rotundal lesion after the monocular discrimination learning resulted in deficits in interocular transfer. These results suggest (1) the bird could learn monocular discrimination with the hemisphere ipsilateral to the viewing eye when the contralateral hemisphere was not accessable, and (2) the bird learned monocular discrimination with the hemisphere contralateral to the viewing eye when both hemispheres were intact. Lesion in OPT did not cause deficits in interocular transfer. This result suggests a crucial role of the tecto-fugal pathway in interocular transfer.
两组鸽子在与用于单眼直线方向辨别训练的眼睛对侧的半球接受了单侧丘脑损伤。第一组在损伤后进行单眼辨别训练，第二组在鸟类成功完成辨别任务训练后接受损伤。然后两组都用它们之前未训练的眼睛进行相同任务的训练，以检查辨别能力的眼间转移。在单眼辨别之前，圆核损伤会延迟原始单眼学习的获得，但不会导致眼间转移出现缺陷，而在单眼辨别学习之后的圆核损伤会导致眼间转移出现缺陷。这些结果表明：（1）当对侧半球无法使用时，鸟类可以用与观察眼同侧的半球学习单眼辨别；（2）当两个半球都完整时，鸟类用与观察眼对侧的半球学习单眼辨别。视顶盖前区（OPT）损伤不会导致眼间转移出现缺陷。这一结果表明顶盖 - 离中通路在眼间转移中起关键作用。
