Organization of monkey superior colliculus: intermediate layer cells discharging before eye movements.
Organization of monkey superior colliculus: intermediate layer cells discharging before eye movements.
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猴上丘的组织：眼球运动前中间层细胞放电。
DOI：
10.1152/jn.1976.39.4.722
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发表时间：
1976
影响因子：
2.5
通讯作者：
Robert H. Wurtz
中科院分区：
文献类型：
--
作者：
C. W. Mohler;Robert H. Wurtz
1.我们研究了上级丘中间层细胞的特征，这些细胞在扫视眼球运动之前增加了放电率。通过训练恒河猴注视一个光点，并在注视点关闭时扫视其他光点，反复引发眼球运动。2.眼动细胞随其在丘内的深度变化一致。细胞放电的开始导致眼球运动的时间更短，放电的持续时间更短，因为细胞位于更接近背边缘的中间层。每个连续细胞的运动场（即视野的区域，在该区域中，眼跳进入该区域之前是细胞放电的爆发）也随着细胞位于更背侧而变得更小。无论细胞在丘内的深度如何，峰放电频率的分布在整个细胞的运动场中保持相当平坦。3.一种新的眼动相关细胞被发现，通常位于浅层和中间层之间的边界。这种类型的细胞，视觉触发的运动细胞，增加其放电率前眼跳作出的视觉刺激，但不是之前自发眼跳的同等幅度的光或暗。在眼球运动之前，这些细胞的剧烈放电依赖于视觉目标的存在;这些细胞似乎将浅层细胞的视觉输入和中间层细胞的运动相关输入联合收割机结合起来。这些细胞的运动视野的大小与它们上面的浅层细胞的视野大小大致相同。
1. We investigated the characteristics of cells in the intermediate layers of the superior colliculus that increase their rate of discharge before saccadic eye movements. Eye movements were repeatedly elicited by training rhesus monkeys to fixate on a spot of light and to make saccades to other spots of light when the fixation spot was turned off. 2. The eye movement cells showed consistent variations with their depth within the colliculus. The onset of the cell discharge led the eye movement by less time and the duration of the discharge was shorter as the cell was located closer to the dorsal edge of the intermediate layers. The movements fields (that area of the visual field where a saccade into the area is preceded by a burst of cell discharges) of each successive cell also became smaller as the cells were located more dorsally. The profile of peak discharge frequency remained fairly flat throughout the movement field of the cells regardless of depth of the cell within the colliculus. 3. A new type of eye movement-related cell has been found which usually lies at the border between the superficial and intermediate layers. This cell type, the visually triggered movement cell, increased its rate of discharge before saccades made to a visual stimulus but not before spontaneous saccades of equal amplitude made in the light or the dark. A vigorous discharge of these cells before an eye movement was dependent on the presence of a visual target; the cells seemed to combine the visual input of superficial layer cells and the movement-related input of the intermediate layer cells. The size of the movement fields of these cells were about the same size as the visual fields of superficial layer cells just above them...