Oblique saccadic eye movements of primates.
Oblique saccadic eye movements of primates.
复制标题
灵长类动物的斜眼扫视运动。
DOI：
10.1152/jn.1986.56.3.769
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发表时间：
1986
影响因子：
2.5
通讯作者：
Fuchs,AF
中科院分区：
文献类型：
--
作者：
King,WM;Lisberger,SG;Fuchs,AF
这些实验的目的是确定灵长类动物斜向扫视的水平和垂直分量的轨迹是否耦合。在视觉跟踪任务中记录了人类和猴子的眼球运动，该任务将一个小的可见目标点跳跃到切线屏幕上的不同位置。对于大于 ca 的斜向扫视。 3 度，水平和垂直分量之间存在耦合，因此较小分量的持续时间比其幅度-持续时间关系预期的要长（“拉伸”）。斜向扫视的拉伸分量的持续时间与眼球运动的矢量幅度线性相关，但与拉伸分量的幅度无关。与相同大小的纯水平或垂直扫视相比，倾斜扫视的拉伸分量具有较低的峰值速度和平均速度。分量速度的降低不是由在扫视开始或结束时插入的低速眼动分量引起的，而是扫视方向和分量幅度的函数。对于任何扫视，峰值和平均分量速度之间存在线性关系。我们将猴子外展神经元的放电与斜向扫视的正向水平分量的特征进行了比较。当斜向扫视的水平分量被拉伸时，外展神经元的突发持续时间被延长。内爆发频率也随着水平分量速度的降低而降低。对于斜向扫视，神经元突发的持续时间与水平分量的持续时间和扫视的矢量幅度相关，但与水平分量本身的幅度不相关。斜向扫视的较小部分的持续时间与较大部分的持续时间成比例，但并不总是等于。通常，较小的组件比较大的组件开始得晚，结束得早。这些结果表明，斜向扫视的水平和垂直分量在中心耦合，使得较小分量的速度降低并且其持续时间增加。对于斜向扫视，大于约。基于纯水平或垂直扫视数据的 3 度、幅度-持续时间和幅度-速度关系不适用。这些发现与最近提出的三个耦合扫视突发发生器模型进行了讨论。
The objective of these experiments was to determine whether the trajectories of the horizontal and vertical components of oblique saccades in primates were coupled. Human and monkey eye movements were recorded during a visual tracking task that jumped a small visible target spot to different locations on a tangent screen. For oblique saccades larger than ca. 3 deg, there was coupling between the horizontal and vertical components so that the duration of the smaller component was longer ("stretched") than would have been expected from its amplitude-duration relationship. The duration of a stretched component of an oblique saccade was linearly related to the vector amplitude of the eye movement but not to the amplitude of the stretched component. Stretched components of oblique saccades had lower peak and average velocities than would have occurred with pure horizontal or vertical saccades of the same size. Decreased component velocity was not caused by low-velocity eye movement components inserted at the beginning or end of the saccade, but was a function of the saccade's direction and component amplitude. For any saccade, there was a linear relationship between peak and average component velocity. We compared the discharge of monkey abducens neurons with the characteristics of the on-direction horizontal components of oblique saccades. The burst duration of an abducens neuron was lengthened when the horizontal component of an oblique saccade was stretched. Intraburst firing frequency was also decreased in correspondence with a decrease in horizontal component velocity. For an oblique saccade, the duration of the neuron's burst was correlated with the duration of the horizontal component and with the vector amplitude of the saccade, but was not correlated with the amplitude of the horizontal component itself. The duration of the smaller component of an oblique saccade was proportional but not always equal to the duration of the larger component. Usually, the smaller component began later and ended earlier than the larger component. These results show that the horizontal and vertical components of oblique saccades are coupled centrally so that the velocity of the smaller component is decreased and its duration is increased. For oblique saccades, larger than ca. 3 deg, amplitude-duration and amplitude-velocity relationships based on pure horizontal or vertical saccade data are not applicable. These findings are discussed in relation to three recently proposed models of coupled saccadic burst generators.