CEREBRAL CORTICAL MECHANISMS FOR EYE MOVEMENTS AND VISUAL ATTENTION

两条不同的调查路线被用来确定大脑是如何 大脑皮质及其传出区域控制眼球运动和视觉空间 请注意。 在一项研究中，我们研究了上丘运动神经元的活动。 与由电刺激 额叶视野或上丘及其颞叶的改变 接近视觉唤起的扫视。在另一种情况下，大脑中的视觉神经元 使用双步骤任务研究了顶叶后皮质，以了解 当存在不和谐时，大脑皮层可能会保持空间准确性 刺激的视网膜位置和眼球跳动之间的关系 获得这种刺激。这一区域的神经元在猴子 跳过正确的方向以获得刺激，无论是还是 并不是说刺激位于神经元的感受场，而是像在 常规的注视任务。这样的神经元需要视觉的存在 刺激，表明在后顶叶皮质，空间 精度是通过可视地图的坐标变换来保持的，而不是 而不是通过对空间中的目标位置进行显式编码。

Two different lines of inquiry were followed to determine how the cerebral cortex and its efferent regions control eye movements and visuospatial attention. In one, activity of movement neurons of the superior colliculus was studied in relation to saccades evoked by electrical stimulation of either the frontal eye field or the superior colliculus and modified by their temporal proximity to visually evoked saccades. In the other, visual neurons in the posterior parietal cortex were studied using double-step tasks to see how this cortex might maintain spatial accuracy when there was a dissonance between the retinal location of a stimulus and the saccade necessary to acquire that stimulus. Neurons in this region discharged when the monkey made a saccade of the proper direction to acquire a stimulus, whether or not that stimulus lay in the neuron's receptive field as studied in a routine fixation task. Such neurons required the presence of a visual stimulus, suggesting that in the posterior parietal cortex, spatial accuracy is maintained by coordinate transformation of a visual map rather than by the explicit coding of target position in space.