Time course of amodal completion revealed by a shape discrimination task
Time course of amodal completion revealed by a shape discrimination task
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DOI：
10.3758/bf03196208
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发表时间：
2001-12-01
影响因子：
3.5
通讯作者：
Bennett, PJ
中科院分区：
文献类型：
--
作者：
Murray, RF;Sekuler, AB;Bennett, PJ
我们测量了运动和静止刺激在15-210毫秒的范围内，作为刺激持续时间的函数的非波动性完成的程度。完成度是用基于表现的衡量标准来评估的：这是一项形状辨别任务，如果刺激是不规律的完成，就很容易，如果不是，就很难。具体地说，参与者判断竖直的矩形是水平还是垂直更长，当矩形没有遮挡时，四角被四个负对比度正方形遮挡，还是四角被四个零对比度正方形遮挡。在零对比度条件下，由于没有遮挡提示，波状补全不会发生；在非遮挡条件下，整个图形都存在。因此，将负对比度条件下的表现与这两个极端进行比较，可以提供一种定量的方法来衡量节律的完成性。这一测量揭示了一个快速但可测量的完成时间过程。运动刺激和静止刺激完成的时间相同(约为75毫秒)，但运动刺激在较长时间内完成的能力略强一些。
We measured the extent of amodal completion as a function of stimulus duration over the range of 15-210 msec, for both moving and stationary stimuli. Completion was assessed using a performance-based measure: a shape discrimination task that is easy if the stimulus is amodally completed and difficult if it is not. Specifically, participants judged whether an upright rectangle was longer horizontally or vertically, when the rectangle was unoccluded, occluded at its corners by four negative-contrast squares, or occluded at its corners by four zero-contrast squares. In the zero-contrast condition, amodal completion did not occur because there were no occlusion cues; in the unoccluded condition, the entire figure was present. Thus, comparing performance in the negative-contrast condition to these two extremes provided a quantitative measure of amodal completion. This measure revealed a rapid but measurable time course for amodal completion. Moving and stationary stimuli took the same amount of time to be completed (approximate to 75 msec), but moving stimuli had slightly stronger completion at long durations.