Context effects in visual length perception: Role of ocular, retinal, and spatial location
Context effects in visual length perception: Role of ocular, retinal, and spatial location
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DOI：
10.3758/bf03194719
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发表时间：
2002-04-01
期刊：
影响因子：
--
通讯作者：
Marks, LE
中科院分区：
文献类型：
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作者：
Arieh, Y;Marks, LE
在三个实验中，我们研究了在外部空间位置有或没有变化的情况下，眼睛之间和视网膜各部分之间的方位相关背景效应的转移。先前的研究表明，当刺激集包括相对较长的水平线和较短的垂直线(上下文条件B)时，垂直线相对于水平线被认为是长的(上下文条件B)，而当刺激集包括相对较短的水平线和较长的垂直线(上下文条件A)时，则相反。因此，背景刺激的集合影响水平-垂直错觉(HVI)的大小，在背景条件A下减小其大小，在背景条件B下增大其大小。实验1表明，将一只眼睛暴露在不同的刺激环境中调节了暴露眼的HVI的大小，但对另一只眼的影响很小或没有影响。实验2和实验3表明，当视网膜位置不变时，背景集合的影响在视网膜相邻部分的概括性较差，但在外部空间的不同位置之间几乎完全转移。因此，视觉长度知觉中的方位相关语境效应似乎仅限于眼睛和受刺激的视网膜区域，这表明这些效应反映了相对较早的和局部的敏感度变化，而不是相对较晚的和反应标准的普遍变化。
In three experiments, we examined the transfer of orientation-contingent context effects between the eyes and across portions of the retina with or without variation in external spatial location. Previous research had shown that vertical lines are judged long, relative to horizontal lines, when the stimulus set comprises relatively long horizontals and short verticals (Contextual Condition B), as compared with the reverse when the stimulus set comprises relatively short horizontals and long verticals (Contextual Condition A). Consequently, the contextual set of stimuli influences the magnitude of the horizontal-vertical illusion (HVI), decreasing its size under Contextual Condition A and increasing its size under Contextual Condition B. Experiment 1 showed that exposing one eye to different stimulus contexts modulated the size of the HVI at the exposed eye but had little or no effect at the other eye. Experiments 2 and 3 showed that the effect of the contextual sets generalized poorly across adjacent portions of the retina but transferred almost perfectly across different locations in external space when retinal location was constant. Thus, orientation-contingent context effects in visual length perception appear to be specific to the eye and to the region of the retina stimulated, suggesting that these effects reflect relatively early and local changes in sensitivity, rather than relatively late and general shifts in response criteria.