VISUAL PROCESSING IN BRAINS FOLLOWING CORTICAL ABLATION

对猴进行单侧额叶眼野消融。 他们 然后接受一系列眼科任务的训练。 他们可以很容易 进行视觉引导的扫视眼球运动，但在 学习根据记忆点做眼球运动。 看看这种缺陷主要是学习缺陷还是运动缺陷 表现缺陷，猴子接受了记忆眼跳任务的训练， 接受了单侧额叶消融术 这些猴子毫无困难 保持记忆中的扫视能力。 然而，对于几个 手术后几周，他们所有的扫视都进入了对侧的视野， 病变的速度和准确性低于同侧的扫视 领域 对短暂闪现的目标的扫视速度较慢，准确性较低 对稳定目标的扫视，以及对记忆目标的扫视， 比那些短暂闪光的目标慢得多，准确性也差得多。 因此 前眼区的消融导致学习和运动 对短暂闪现或记住的目标的扫视表现缺陷。 单侧上级丘消融导致短暂的功能障碍 在眼跳潜伏期和运动成绩方面， 对视觉目标的扫视和对记忆目标的扫视之间的差异。

Monkeys were prepared with unilateral frontal eye field ablations. They were then trained on a series of oculomotor tasks. They could easily perform visually guided saccadic eye movements but were impaired in learning to make eye movements to remembered points. To see if this deficit were primarily a learning deficit or a motor performance deficit, monkeys were trained on remembered saccade tasks then underwent unilateral frontal ablations. These monkeys had no difficulty retaining the ability to make remembered saccades. However, for several weeks after surgery all of their saccades into the field contralateral to the lesion were slower and less accurate than saccades into the ipsilateral field. Saccades to briefly flashed targets were slower and less accurate than saccades to stable targets, and saccades to remembered targets were far slower and less accurate than those to briefly flashed targets. Thus ablation of the frontal eye fields causes both a learning and a motor performance deficit for saccades to briefly flashed or remembered targets. Unilateral ablation of the superior colliculus caused short-lived deficits in saccade latency and motor performance, but no differential effect between saccades to visual targets and saccades to remembered targets.