VISUAL MOSSY FIBER INPUTS TO THE FLOCCULUS OF THE MONKEY
VISUAL MOSSY FIBER INPUTS TO THE FLOCCULUS OF THE MONKEY
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DOI：
10.1111/j.1749-6632.1981.tb30892.x
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发表时间：
1981-01-01
影响因子：
5.2
通讯作者：
NODA, H
中科院分区：
文献类型：
--
作者：
NODA, H
最近在猴子身上进行的单单位研究，训练它们跟踪缓慢移动的视觉目标，暗示小脑小叶控制平滑追踪的眼球运动。[4]平滑追踪眼球运动是试图将眼球运动的角速度与运动物体的速度相匹配的结果，因此物体的图像在运动的视网膜上保持相对静止。我们观察到，在无头部转动的平稳追踪过程中，小脑小叶中某些浦肯野细胞的放电率与眼球运动速度有关。在这种情况下，由于物体的图像随着视网膜移动，浦肯野细胞活动的调制主要反映了眼动系统中出现的眼速度信号。另一方面，当眼睛速度小于物体速度时，眼睛运动滞后于运动的物体，并且其视网膜图像发生滑动。移动物体的速度则对应于眼睛速度和视网膜图像速度的代数和。因此，在一些被认为是平滑追踪系统组成部分的大脑结构中，应该可以观察到反映这些速度信号总和的神经活动。为了有资格作为平滑追踪控制系统的一部分，小叶可能必须从视觉系统接收关于视网膜图像运动的信息。然而，部分由于携带视觉信息的纤维仅占传入纤维的一小部分，因此对猴小叶的视觉输入信号的性质大多是未知的。本研究的目的是研究视觉信号的特点，带来的小叶的猴子。
Recent single-unit studies in monkeys, trained to track a slowly moving visual target, implicate the cerebellar flocculus in the control of smooth-pursuit eye movements.’-4 A smooth-pursuit eye movement is the result of an attempt to match the angular velocity of eye movement to the velocity of a moving object, and consequently the object’s image is held relatively stationary on the moving retina. It has been observed that discharge rates of some Purkinje cells in the flocculus are modulated typically in relation to the velocity of eye movements during smooth pursuit in the absence of head r~ tation.’.~ In this situation, since the image of the object moves with the retina, the modulation in Purkinje cell activity reflects primarily eye velocity signals arising in the oculomotor system. On the other hand, when eye velocity is smaller than object velocity, the eye movement lags behind the moving object and there occurs slippage of its retinal image. The velocity of the moving object then corresponds to the algebraic sum of eye velocity and retinal image velocity. Neural activity reflecting the sum of such velocity signals should, therefore, be observed in some brain structures thought to be constituents of the smooth-pursuit system. In order to qualify as a part of the smooth-pursuit control system, the flocculus may have to receive information about retinal image motion from the visual system. The existence of visual inputs to the flocculus of the monkey has been However, partially because the fibers carrying visual information comprise only a small percentage of the afferent fibers, the properties of visual input signals to the monkey flocculus mostly are unknown. The aim of the present investigation was to study the characteristics of visual signals that are brought to the flocculus of the monkey.