Perceived motion direction during smooth pursuit eye movements
Perceived motion direction during smooth pursuit eye movements
复制标题
平滑追踪眼球运动期间感知的运动方向
DOI：
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复制
发表时间：
2005
影响因子：
2
通讯作者：
A. Wertheim
中科院分区：
文献类型：
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作者：
J. Souman;I. Hooge;A. Wertheim
虽然许多研究致力于平稳追踪眼球运动中的运动知觉，但对于不同刺激方向上这些眼球运动的补偿是否相同的问题，人们关注的相对较少。少数针对这一问题的研究得出了相互矛盾的结论。我们测量了水平眼球追逐整个360°范围内的刺激方向时，刺激点的感知运动方向。刺激以3°或8°移动/S。通过对追踪过程中运动知觉的经典线性模型的拟合来评估补偿度的稳定性。根据该模型，感知的速度是将估计眼睛速度的眼动信号与估计给定刺激对象的视网膜图像速度的视网膜信号相加的结果。感知的方向取决于两个信号的增益比，这被假设为在刺激方向上是恒定的。该模型提供了与数据很好的拟合，表明薪酬在刺激方向上确实是恒定的。此外，刺激速度越高，增益率越低，这解释了文献中结果的差异。
Although many studies have been devoted to motion perception during smooth pursuit eye movements, relatively little attention has been paid to the question of whether the compensation for the effects of these eye movements is the same across different stimulus directions. The few studies that have addressed this issue provide conflicting conclusions. We measured the perceived motion direction of a stimulus dot during horizontal ocular pursuit for stimulus directions spanning the entire range of 360°. The stimulus moved at either 3 or 8°/s. Constancy of the degree of compensation was assessed by fitting the classical linear model of motion perception during pursuit. According to this model, the perceived velocity is the result of adding an eye movement signal that estimates the eye velocity to the retinal signal that estimates the retinal image velocity for a given stimulus object. The perceived direction depends on the gain ratio of the two signals, which is assumed to be constant across stimulus directions. The model provided a good fit to the data, suggesting that compensation is indeed constant across stimulus direction. Moreover, the gain ratio was lower for the higher stimulus speed, explaining differences in results in the literature.