Apparent size of an object remains uncompressed during presaccadic compression of visual space
Apparent size of an object remains uncompressed during presaccadic compression of visual space
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DOI：
10.1016/s0042-6989(01)00174-2
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发表时间：
2001-10-01
期刊：
影响因子：
1.8
通讯作者：
Uchikawa, K
中科院分区：
文献类型：
--
作者：
Matsumiya, K;Uchikawa, K
众所周知，当视觉刺激在眼跳之前在视觉参考上的各个位置短暂闪现时，视觉空间的压缩发生在眼跳目标附近。我们研究了视觉空间的前视压缩如何影响物体的表观尺寸。在第一个实验中，受试者被指示报告在扫视开始的时间周围简要呈现的多个条的明显数量。所报告的四个条的数量在扫视之前的50 ms标记处开始下降，并且在扫视开始附近达到最小值。这证实了视觉空间的压缩发生在扫视之前。在第二个实验中，受试者判断一个矩形（一个单一的元素）或四个酒吧（四个元素）之前，扫视呈现的明显宽度。四条刺激的表观宽度在扫视前被压缩。但矩形刺激的电流没有被压缩。实验3表明，四条刺激的宽度压缩与位置压缩预测的宽度变化是一致的。这些研究结果表明，一个单一的对象的形状是不扭曲的眼跳目标在视觉空间的前视压缩。另外。实验4表明，快速扫视前闪光刺激的表观宽度取决于整体形状的加工。这将视觉空间的预加速压缩期间的视觉对象的定义扩展到不仅是固体元素，而且是多个元素的星座。此外。来自这些实验的结果表明视觉空间的扫视前压缩不会阻止在产生扫视眼球运动中的注意机制下的对象识别。(C)2001爱思唯尔科技有限公司版权所有。
It is well known that compression of visual space occurs near the saccade goal when visual stimuli are briefly flashed at various locations on a visual reference just before a saccade. We investigated how presaccadic compression of visual space affected the apparent size of an object. In the first experiment, subjects were instructed to report the apparent number of multiple bars briefly presented around the time of saccade onset. The reported number of four bars began to decline at the 50 ms mark before a saccade and reached a minimum near the saccade onset. This confirms that the compression of visual space occurs just before saccades. In the second experiment, subjects judged the apparent width of a rectangle (a single element) or four bars (four elements) presented just before saccades. The apparent width of the four-bar stimulus was compressed just before saccades. but that of the rectangle stimulus was not compressed. Experiment 3 shows that the width compression of the four-bar stimulus is consistent with the width change predicted by compression of position. These findings indicate that the shape of a single object is not distorted at the saccade goal during presaccadic compression of visual space. In addition. experiment 4 indicates that the apparent width of a flashed stimulus just before saccades depends on the processing of global shape. This extends the definition of a visual object during presaccadic compression of visual space to not only a solid element but also a constellation of multiple elements. Furthermore. the results from these experiments suggest that presaccadic compression of visual space does not prevent object recognition underlying an attentional mechanism in generating saccadic eye movements. (C) 2001 Elsevier Science Ltd. All rights reserved.