Rapid horizontal gaze movement in the monkey.
Rapid horizontal gaze movement in the monkey.
复制标题
猴子的快速水平注视运动。
DOI：
10.1152/jn.1995.73.4.1632
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Plorde,JJ
中科院分区：
文献类型：
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作者：
Phillips,JO;Ling,L;Fuchs,AF;Siebold,C;Plorde,JJ
1. 我们研究了三只猴子的水平眼睛和头部运动，它们被训练将目光（眼睛在空间中的位置）指向跳跃的目标，同时它们的头部都是固定的，并且可以围绕垂直轴自由旋转。我们考虑了所有移动到新视觉目标距离的>或= 80%的凝视运动。2. 眼睛和头部运动对注视转移的相对贡献和指标在不同动物之间，甚至在动物内部都有很大差异。头部运动可早可晚，可大可小。随着头部的加速，一些猴子的眼球运动速度持续下降，而另一些猴子则没有。尽管所有的目光转移都是低计量的，但在一些猴子身上，它们比其他猴子更低计量。然而，目光转移的某些特征在所有猴子身上都是可识别的。为了识别这些目标，我们分析了目光、眼睛的头部位置和头部位置，以及它们在目光转移过程中的三个时间点的速度：1)当眼睛完成向目标的初始旋转时，2)当最初的目光转移完成时，3)当头部运动结束时。3. 对于小的凝视移动（< 20度），最初的凝视运动完全由眼球运动组成，因为头部没有移动。随着注视位移的增大，眼球运动对初始注视运动的贡献在30度左右达到饱和，头部运动对初始注视运动的贡献越来越大。对于最大的目光转移，眼睛通常在目光落地前开始反向转动或保持稳定在轨道上。在眼睛和凝视结束之间的间隔中，只有头部完成了凝视。最后，当头部运动落地时，它几乎瞄准了目标，眼睛回到了正前方10 +/- 7度（平均+/- SD）的范围内。在目光转移结束和头部运动结束之间，目光在空间中保持稳定或发生小的纠正性扫视。4. 无论头部是固定的还是自由的，凝视运动< 20度都能准确地瞄准目标。对于较大的目标运动，无头部和固定头部的凝视转移都变得越来越低计量。平均而言，无头注视的转移更准确，但也更多变。这表明，当头部自由时，凝视的控制方式不同。对于目标振幅< 60度，头部位置是低计量的，但误差相当恒定，约为10度。（摘要删节为400字）
1. We studied horizontal eye and head movements in three monkeys that were trained to direct their gaze (eye position in space) toward jumping targets while their heads were both fixed and free to rotate about a vertical axis. We considered all gaze movements that traveled > or = 80% of the distance to the new visual target. 2. The relative contributions and metrics of eye and head movements to the gaze shift varied considerably from animal to animal and even within animals. Head movements could be initiated early or late and could be large or small. The eye movements of some monkeys showed a consistent decrease in velocity as the head accelerated, whereas others did not. Although all gaze shifts were hypometric, they were more hypometric in some monkeys than in others. Nevertheless, certain features of the gaze shift were identifiable in all monkeys. To identify those we analyzed gaze, eye in head position, and head position, and their velocities at three points in time during the gaze shift: 1) when the eye had completed its initial rotation toward the target, 2) when the initial gaze shift had landed, and 3) when the head movement was finished. 3. For small gaze shifts (< 20 degrees) the initial gaze movement consisted entirely of an eye movement because the head did not move. As gaze shifts became larger, the eye movement contribution saturated at approximately 30 degrees and the head movement contributed increasingly to the initial gaze movement. For the largest gaze shifts, the eye usually began counterrolling or remained stable in the orbit before gaze landed. During the interval between eye and gaze end, the head alone carried gaze to completion. Finally, when the head movement landed, it was almost aimed at the target and the eye had returned to within 10 +/- 7 degrees, mean +/- SD, of straight ahead. Between the end of the gaze shift and the end of the head movement, gaze remained stable in space or a small correction saccade occurred. 4. Gaze movements < 20 degrees landed accurately on target whether the head was fixed or free. For larger target movements, both head-free and head-fixed gaze shifts became increasingly hypometric. Head-free gaze shifts were more accurate, on average, but also more variable. This suggests that gaze is controlled in a different way with the head free. For target amplitudes < 60 degrees, head position was hypometric but the error was rather constant at approximately 10 degrees.(ABSTRACT TRUNCATED AT 400 WORDS)