Presaccadic motion integration drives a predictive postsaccadic following response.
Presaccadic motion integration drives a predictive postsaccadic following response.
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扫视前运动集成可驱动预测性扫视后跟随响应
DOI：
10.1167/19.11.12
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发表时间：
2019
影响因子：
1.8
通讯作者：
Mitchel
中科院分区：
文献类型：
--
作者：
Mitchel
扫视眼球运动对视觉世界进行采样，确保整个视野的高敏锐度。为了补偿处理过程中的延迟，对运动目标的扫视需要预测：眼睛必须拦截目标未来的位置，然后追踪其运动方向。尽管预测对自愿追逐至关重要，但目前还不清楚它是否是扫视规划的必备特征。眼跳计划涉及对目标的一种非自愿的增强处理，称为扫视前注意。这种前视注意力会自动招来顺畅的眼球运动吗？为了测试这一点，我们让人类参与者对四个光圈中的一个进行扫视，这些光圈是静态的，但每个光圈都包含一个随机的点场，其运动与所需的扫视相切。在这项任务中，眼跳沿着目标运动的方向偏离，眼球在眼跳着陆时表现出跟随的反应。这种眼跳后跟随反应(PFR)随着目标位置的空间不确定性而增加，甚至当我们在眼跳的中途去除运动刺激时也持续存在，证实它依赖于眼跳前的信息。眼跳前50-100ms的运动对PFR的影响最大，这与扫视前注意中报告的知觉增强的时间进程一致。最后，PFR的大小与刺激速度的对数呈线性关系，并且通常具有较低的增益，类似于在突然运动开始后通常观察到的无意识眼球跟随运动。这些结果表明，眼跳前注意有预见性地选择目标的运动特征，可能是为了确保对运动中的眼跳目标进行成功的即时跟踪。
Saccadic eye movements sample the visual world and ensure high acuity across the visual field. To compensate for delays in processing, saccades to moving targets require predictions: The eyes must intercept the target's future position to then pursue its direction of motion. Although prediction is crucial to voluntary pursuit, it is unclear whether it is an obligatory feature of saccade planning. Saccade planning involves an involuntary enhanced processing of the target, called presaccadic attention. Does this presaccadic attention recruit smooth eye movements automatically? To test this, we had human participants perform a saccade to one of four apertures, which were static, but each contained a random dot field with motion tangential to the required saccade. In this task, saccades were deviated along the direction of target motion, and the eyes exhibited a following response upon saccade landing. This postsaccadic following response (PFR) increased with spatial uncertainty of the target position and persisted even when we removed the motion stimulus in midflight of the saccade, confirming that it relied on presaccadic information. Motion from 50–100 ms prior to the saccade had the strongest influence on PFR, consistent with the time course of perceptual enhancements reported in presaccadic attention. Finally, the PFR magnitude related linearly to the logarithm of stimulus velocity and generally had low gain, similar to involuntary ocular following movements commonly observed after sudden motion onsets. These results suggest that presaccadic attention selects motion features of targets predictively, presumably to ensure successful immediate tracking of saccade targets in motion.
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