Two distinct visual motion mechanisms for smooth pursuit: evidence from individual differences.
Two distinct visual motion mechanisms for smooth pursuit: evidence from individual differences.
复制标题
平滑追踪的两种不同的视觉运动机制：来自个体差异的证据。
DOI：
10.1016/j.neuron.2007.06.007
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发表时间：
2007
期刊：
影响因子：
16.2
通讯作者：
Nakayama,Ken
中科院分区：
文献类型：
--
作者：
Wilmer,JeremyB;Nakayama,Ken
在最初的追赶扫视之后，对移动目标的平滑追踪眼速度比之前更准确，这种增强对人们的理解很少。我们提出了一种基于个体差异的方法来识别生理反应背后的机制，并使用它来测试视觉运动信号驱动的追求在扫视前和扫视后是否不同。通过将每时每刻的追求测量与注视过程中速度估计的两种心理物理测量相关联，我们发现个体之间存在两种独立的关联。用低阶（基于运动能量）速度估计的精度来预测预进跟踪加速度，用高阶（位置跟踪）速度估计的精度来预测后进跟踪精度。这些结果提供了低水平运动信号影响眼动前加速和独立的高水平运动信号影响眼动后精度的证据，从而提出了眼动后追求增强的合理机制。
Smooth-pursuit eye velocity to a moving target is more accurate after an initial catch-up saccade than before, an enhancement that is poorly understood. We present an individual-differences-based method for identifying mechanisms underlying a physiological response and use it to test whether visual motion signals driving pursuit differ pre- and postsaccade. Correlating moment-to-moment measurements of pursuit over time with two psychophysical measures of speed estimation during fixation, we find two independent associations across individuals. Presaccadic pursuit acceleration is predicted by the precision of low-level (motion-energy-based) speed estimation, and postsaccadic pursuit precision is predicted by the precision of high-level (position-tracking) speed estimation. These results provide evidence that a low-level motion signal influences presaccadic acceleration and an independent high-level motion signal influences postsaccadic precision, thus presenting a plausible mechanism for postsaccadic enhancement of pursuit.