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扫视前视觉空间压缩在跨扫视眼动的空间重映射中的作用。

The role of presaccadic compression of visual space in spatial remapping across saccadic eye movements.

作者信息

Matsumiya Kazumichi, Uchikawa Keiji

机构信息

Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.

出版信息

Vision Res. 2003 Aug;43(18):1969-81. doi: 10.1016/s0042-6989(03)00301-8.

Abstract

When multiple bars are briefly flashed near the saccadic goal on a visual reference just before a saccade, the total width of the multiple bars appears to be compressed toward the saccadic goal. We show that presaccadic compression of visual space is related to the attribution of the displacement of a visual stimulus to the displacement of another stimulus appearing after the saccade. Subjects observed a bar and a ruler. The bar was displaced during a saccade and the ruler disappeared briefly at the same time, and then the ruler reappeared at the same location after the saccade. The subjects had the impression that the bar appeared to remain stationary and the ruler appeared to be displaced after the saccade. This impression occurs strongly when the amount of the compression of visual space reaches the maximum at the saccade onset. Also, it occurs only at the saccadic goal in the same way as presaccadic compression of visual space. Saccadic suppression of displacement was equivalent at the saccadic goal and in the location opposite to the saccadic goal, indicating that the attribution of the bar displacement to the displacement of the ruler appearing after the saccade is not a consequence of saccadic suppression of displacement. Furthermore, performing a direction discrimination task showed that the bar appears stationary at the saccadic goal during compression of visual space even when the bar was actually displaced. We interpret these results as showing that presaccadic compression of visual space establishes the location of the saccadic goal (the bar) as a reference and then the location of the ruler is remapped relative to the reference location after the saccade, resulting in the illusory displacement of the ruler.

摘要

当在扫视之前,在视觉参考上靠近扫视目标处短暂闪现多个条时,多个条的总宽度似乎朝着扫视目标被压缩。我们表明,扫视前视觉空间的压缩与将视觉刺激的位移归因于扫视后出现的另一个刺激的位移有关。受试者观察一个条和一把尺子。条在扫视期间发生位移,尺子同时短暂消失,然后在扫视后在同一位置重新出现。受试者有这样的印象,即条似乎保持静止,而尺子在扫视后似乎发生了位移。当视觉空间压缩量在扫视开始时达到最大时,这种印象强烈出现。而且,它也仅在扫视目标处出现,与扫视前视觉空间的压缩方式相同。扫视目标处和与扫视目标相对的位置上,扫视对位移的抑制是等效的,这表明将条的位移归因于扫视后出现的尺子的位移不是扫视对位移抑制的结果。此外,执行方向辨别任务表明,即使条实际上发生了位移,在视觉空间压缩期间,条在扫视目标处似乎也是静止的。我们将这些结果解释为表明,扫视前视觉空间的压缩将扫视目标(条)的位置确立为参考,然后在扫视后尺子的位置相对于参考位置重新映射,从而导致尺子的虚幻位移。

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