Plomp Gijs, van Leeuwen Cees
Laboratory of Perceptual Dynamics, Brain Science Institute, RIKEN BSI, Wako-Shi, Japan.
Percept Psychophys. 2006 Aug;68(6):946-58. doi: 10.3758/bf03193357.
In three experiments, we examined the effect of temporal context in amodal completion of partly occluded nontarget figures. In a primed same-different task, test pairs were preceded by a sequence of two primes, one of which was a single, the other a composite figure. Single figures reappeared in the composite ones, which also contained a square that could be viewed, alternatively, as an occluder or as yielding a mosaic fit to the other shape. To measure context influences between single and composite figures, both of which were nontargets, we studied their combined effect as primes on the test pairs of the same-different task, expecting that congruency between both primes should lead to a superadditive priming effect on the task. We found that single figures presented first provided facilitatory context for local and global occlusion as well as for mosaic interpretations of subsequently presented composite figures. These effects occurred only when the composite figure was presented briefly (50 msec). No superadditive facilitation occurred when composite figures were presented first and single figures followed them. The restriction of the effect to short presentations and its temporal asymmetry were taken as evidence that prior context biases possible occlusion interpretations during the process of completion, rather than afterward.
在三项实验中，我们研究了时间背景对部分遮挡的非目标图形的无模态完成的影响。在一个启动的相同-不同任务中，测试对之前有两个启动刺激序列，其中一个是单个图形，另一个是复合图形。单个图形会重新出现在复合图形中，复合图形还包含一个正方形，这个正方形既可以被视为遮挡物，也可以被视为与另一个形状形成镶嵌匹配。为了测量单个图形和复合图形（两者均为非目标图形）之间的背景影响，我们研究了它们作为启动刺激对相同-不同任务测试对的综合影响，预期两个启动刺激之间的一致性会导致对该任务产生超加性启动效应。我们发现，首先呈现的单个图形为局部和全局遮挡以及随后呈现的复合图形的镶嵌解释提供了促进性背景。这些效应仅在复合图形短暂呈现（50毫秒）时出现。当首先呈现复合图形，然后呈现单个图形时，未出现超加性促进作用。该效应仅限于短暂呈现且具有时间不对称性，这被视为证据，表明先前的背景在完成过程中而非之后偏向于可能的遮挡解释。
