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首页> 外文期刊>Journal of Neurophysiology >Learning the trajectory of a moving visual target and evolution of its tracking in the monkey
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Learning the trajectory of a moving visual target and evolution of its tracking in the monkey

机译：学习运动目标的轨迹及其在猴子中的跟踪演变

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An object moving in the visual field triggers a saccade that brings its image onto the fovea. It is followed by a combination of slow eye movements and catch-up saccades that try to keep the target image on the fovea as long as possible. The accuracy of this ability to track the "here-andnow" location of a visual target contrasts with the spatiotemporally distributed nature of its encoding in the brain. We show in six experimentally naive monkeys how this performance is acquired and gradually evolves during successive daily sessions. During the early exposure, the tracking is mostly saltatory, made of relatively large saccades separated by low eye velocity episodes, demonstrating that accurate ( here and now) pursuit is not spontaneous and that gaze direction lags behind its location most of the time. Over the sessions, while the pursuit velocity is enhanced, the gaze is more frequently directed toward the current target location as a consequence of a 25% reduction in the number of catch-up saccades and a 37% reduction in size ( for the first saccade). This smoothing is observed at several scales: during the course of single trials, across the set of trials within a session, and over successive sessions. We explain the neurophysiological processes responsible for this combined evolution of saccades and pursuit in the absence of stringent training constraints. More generally, our study shows that the oculomotor system can be used to discover the neural mechanisms underlying the ability to synchronize a motor effector with a dynamic external event.
机译：在视野中移动的物体会触发扫视，从而将其图像移到中央凹上。继之以缓慢的眼球运动和追赶扫视相结合，试图将目标图像尽可能长时间地保留在中央凹上。跟踪视觉目标的“这里和现在”位置的能力的准确性与其在大脑中的编码时空分布的性质形成对比。我们在六只实验幼稚的猴子中展示了这种性能如何在连续的每日训练中获得并逐渐演变。在早期曝光期间，跟踪大部分是咸的，由相对较大的扫视点组成，眼球速度低，发作间隔很短，表明准确的（此时此地）跟踪不是自发的，并且注视方向大多数时候都落后于其位置。在整个训练过程中，提高追踪速度的同时，由于追赶扫视的次数减少了25％，尺寸减小了37％（对于第一个扫视，视线更频繁地指向当前目标位置） ）。这种平滑化有多种尺度：在单次试验过程中，在一届会议中的一系列试验中以及在连续的会议中。我们解释了在没有严格的训练约束的情况下，扫视运动和追击运动共同作用的神经生理过程。更广泛地说，我们的研究表明动眼系统可用于发现将运动效应器与动态外部事件同步的潜在能力的神经机制。

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