目标消失期间的平稳跟踪表现不会影响预测性扫视的触发。

Smooth pursuit performance during target blanking does not influence the triggering of predictive saccades.

作者信息

Orban de Xivry Jean-Jacques, Missal Marcus, Lefèvre Philippe

机构信息

Biomedical Engineering Department, Johns Hopkins University, Baltimore, MD, USA.

出版信息

J Vis. 2009 Oct 6;9(11):7.1-16. doi: 10.1167/9.11.7.

Abstract

Visually guided catch-up saccades during the pursuit of a moving target are highly influenced by smooth pursuit performance. For example, the decision to execute a saccade and its amplitude is driven by the difference in velocity between the eye and the target. In previous studies, we have demonstrated that the predictive saccades that occur during the blanking of the moving target compensate for the variability of the smooth pursuit response. Therefore, we wondered whether the predictive smooth pursuit response during target blanking influenced the occurrence of predictive saccades, which is the case for visually guided catch-up saccades. To answer this question, we asked subjects to track visually a target moving along a circular path. From time to time, the target was unexpectedly blanked for some randomized durations and disappeared from the screen. Surprisingly, we did not find any differences in smooth pursuit performance between the blanks that did and those that did not contain predictive saccades. In addition, during the blanks, the differences in smooth pursuit performance across the sessions or across the subjects did not correlate with the differences in the number of predictive saccades. Therefore, this study demonstrates that smooth pursuit performance does not influence the occurrence of predictive saccades. We interpret these results in light of the possible minimization of position error at target reappearance, which heavily depends on the saccadic amplitudes but not on their timing.

摘要

在追踪移动目标时,视觉引导的追赶扫视受平稳跟踪性能的影响很大。例如,执行扫视的决定及其幅度是由眼睛与目标之间的速度差异驱动的。在先前的研究中,我们已经证明,在移动目标消失期间出现的预测性扫视补偿了平稳跟踪反应的变异性。因此,我们想知道目标消失期间的预测性平稳跟踪反应是否会影响预测性扫视的发生,视觉引导的追赶扫视就是这种情况。为了回答这个问题,我们让受试者视觉跟踪沿圆形路径移动的目标。目标会不时意外消失一段随机时长并从屏幕上消失。令人惊讶的是,我们发现在包含预测性扫视的消失时段和平不包含预测性扫视的消失时段之间,平稳跟踪性能没有任何差异。此外,在消失时段内,各实验环节或各受试者之间平稳跟踪性能的差异与预测性扫视数量的差异不相关。因此,本研究表明平稳跟踪性能不会影响预测性扫视的发生。我们根据目标重新出现时位置误差可能最小化来解释这些结果,这在很大程度上取决于扫视幅度而非其时间。

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