Hui Jiahan, Wang Yue, Zhang Peng, Tse Peter U, Cavanagh Patrick
Department of Psychological and Brain Sciences, Dartmouth College, Hanover, New Hampshire, United States; State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China.
Iperception. 2020 Jul 14;11(4):2041669520933309. doi: 10.1177/2041669520933309. eCollection 2020 Jul-Aug.
When a Gabor moves in one direction in the visual periphery while its internal texture moves in the orthogonal direction, its perceived direction can deviate from its physical direction by as much as 45° or more. Lisi et al. showed that immediate saccades go to the physical location of double-drift targets, whereas delayed saccades primarily go to their perceived locations. Here, we investigated whether the apparent motion seen from the offset of a double-drift stimulus to the onset of a later target probe originates from the perceived or physical location of the double-drift stimulus. We find that apparent motion proceeds away from the perceived position of the double-drift stimulus at all temporal delays. This suggests that apparent motion is computed in perceptual rather than retinotopic coordinates.
当一个加博尔（Gabor）图形在视觉外周沿一个方向移动，而其内部纹理沿正交方向移动时，其感知方向可能会偏离其物理方向多达45°或更多。利西（Lisi）等人表明，即时扫视会指向双漂移目标的物理位置，而延迟扫视主要指向其感知位置。在这里，我们研究了从双漂移刺激的偏移到后来目标探测的开始所看到的表观运动是否源自双漂移刺激的感知位置或物理位置。我们发现，在所有时间延迟下，表观运动都从双漂移刺激的感知位置向外进行。这表明表观运动是在感知坐标而非视网膜拓扑坐标中计算的。
