Evidence for a link between the extra-retinal component of random-onset pursuit and the anticipatory pursuit of predictable object motion
Evidence for a link between the extra-retinal component of random-onset pursuit and the anticipatory pursuit of predictable object motion
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DOI：
10.1152/jn.00060.2008
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发表时间：
2008-08-01
影响因子：
2.5
通讯作者：
Collins, C. J. S.
中科院分区：
文献类型：
--
作者：
Barnes, G. R.;Collins, C. J. S.
在追逐暂时消失的移动目标的过程中，残留的平滑眼球运动代表了追逐的内部(视网膜外)部分。然而，这种反应取决于对目标重现的预期。通过比较在早期随机发作追踪中有和没有这种期望的反应，我们检查了视网膜外成分的时间发展，并将其与另一种形式的内部驱动反应--预期追踪进行比较。在最初的任务中(斜坡中段消光)，移动的随机速度目标最初可见100或150毫秒，但随后熄灭600毫秒，然后重新出现并继续移动。反应包括最初视觉驱动的眼速快速增加，随后在消光过程中继而较慢的增加。在第二个任务(短斜道)中，在初始目标呈现相同但没有目标再现预期的情况下，最初眼速的快速上升之后是趋于零的衰减。对这些任务的反应之间的期望相关差异在消退过程中增加的速度比最初的视觉驱动成分慢得多。在第三个任务(初始消光)中，运动目标在运动开始时被熄灭，但在600毫秒后重新出现。相同刺激的重复引起由初始目标偏移量触发的预期追逐。这种基于先前刺激记忆速度的预期反应的时间发展和尺度，与中坡道消退任务和短坡道任务之间的差异非常相似，并随着其差异而变化。结果表明，一种共同的机制负责预期追逐和随机开始追逐的视网膜外部分，这一发现与先前发展的追逐模型一致。
During pursuit of moving targets that temporarily disappear, residual smooth eye movements represent the internal (extra-retinal) component of pursuit. However, this response is dependent on expectation of target reappearance. By comparing responses with and without such expectation during early random-onset pursuit, we examined the temporal development of the extra-retinal component and compared it with anticipatory pursuit, another form of internally driven response. In an initial task (mid-ramp extinction), a moving, random-velocity target was initially visible for 100 or 150 ms but then extinguished for 600 ms before reappearing and continuing to move. Responses comprised an initial visually driven rapid rise in eye velocity, followed by a secondary slower increase during extinction. In a second task (short ramp), with identical initial target presentation but no expectation of target reappearance, the initial rapid rise in eye velocity was followed by decay toward zero. The expectation-dependent difference between responses to these tasks increased in velocity during extinction much more slowly than the initial, visually driven component. In a third task (initial extinction), the moving target was extinguished at motion onset but reappeared 600 ms later. Repetition of identical stimuli evoked anticipatory pursuit triggered by initial target offset. Temporal development and scaling of this anticipatory response, which was based on remembered velocity from prior stimuli, was remarkably similar to and covaried with the difference between mid-ramp extinction and short ramp tasks. Results suggest a common mechanism is responsible for anticipatory pursuit and the extra-retinal component of random-onset pursuit, a finding that is consistent with a previously developed model of pursuit.