Visuomotor properties of corticotectal cells in area 17 and posteromedial lateral suprasylvian (PMLS) cortex of the cat.
Visuomotor properties of corticotectal cells in area 17 and posteromedial lateral suprasylvian (PMLS) cortex of the cat.
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猫第 17 区和后内侧外侧上裂皮层 (PMLS) 皮质细胞的视觉运动特性。
DOI：
10.1017/s0952523801181071
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发表时间：
2001
影响因子：
1.9
通讯作者：
Gafka,AC
中科院分区：
文献类型：
--
作者：
Weyand,TG;Gafka,AC
我们研究了两个视觉皮质区[17区和后内侧外侧上皮层（PMLS）]的猫的皮质顶盖（CT）细胞的视觉活动。猫在简单的眼任务，头部位置是固定的。大多数CT细胞在这两个皮质区给予了有力的放电，以一个小的刺激，用于控制凝视时，它落在retinotopically定义的视野。然而，视觉反应的活力并不能预测启动扫视的潜伏期、扫视速度、幅度，甚至不能预测是否会进行扫视，从而最大限度地减少了这些细胞在前运动或注意过程中可能发挥的任何潜在作用。大多数CT细胞在这两个领域的刺激运动的方向有选择性，和细胞在PMLS显示出一个方向偏好有利于远离中心注视点的运动。CT细胞在黑暗中不随眼球运动而放电。在光线下的眼球运动过程中，17区的许多CT细胞增加了它们的活性。相比之下，PMLS中的细胞，包括CT细胞，在扫视期间通常没有反应。奇怪的是，PMLS中的细胞对以扫视速度移动的刺激做出强烈反应，这表明眼动系统抑制了通过在照明场景中移动视网膜引起的视觉活动。几乎所有的CT细胞都在20-90 Hz的频率范围内表现出振荡活动，特别是对视觉刺激的反应。然而，这种活动是反复无常的;尽管刺激条件相同，但一次试验中的强烈振荡可能在下一次试验中消失。虽然CT细胞在这两个地区有许多共同的特点，方向各向异性和抑制活动的眼球运动过程中的PMLS神经元的特点表明，这两个领域有不同的角色，促进知觉/运动过程中的上级丘的水平。
We studied the visuomotor activity of corticotectal (CT) cells in two visual cortical areas [area 17 and the posteromedial lateral suprasylvian cortex (PMLS)] of the cat. The cats were trained in simple oculomotor tasks, and head position was fixed. Most CT cells in both cortical areas gave a vigorous discharge to a small stimulus used to control gaze when it fell within the retinotopically defined visual field. However, the vigor of the visual response did not predict latency to initiate a saccade, saccade velocity, amplitude, or even if a saccade would be made, minimizing any potential role these cells might have in premotor or attentional processes. Most CT cells in both areas were selective for direction of stimulus motion, and cells in PMLS showed a direction preference favoring motion away from points of central gaze. CT cells did not discharge with eye movements in the dark. During eye movements in the light, many CT cells in area 17 increased their activity. In contrast, cells in PMLS, including CT cells, were generally unresponsive during saccades. Paradoxically, cells in PMLS responded vigorously to stimuli moving at saccadic velocities, indicating that the oculomotor system suppresses visual activity elicited by moving the retina across an illuminated scene. Nearly all CT cells showed oscillatory activity in the frequency range of 20–90 Hz, especially in response to visual stimuli. However, this activity was capricious; strong oscillations in one trial could disappear in the next despite identical stimulus conditions. Although the CT cells in both of these regions share many characteristics, the direction anisotropy and the suppression of activity during eye movements which characterize the neurons in PMLS suggests that these two areas have different roles in facilitating perceptual/motor processes at the level of the superior colliculus.