Contour interaction in fovea and periphery
Contour interaction in fovea and periphery
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DOI：
10.1364/josaa.17.001516
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发表时间：
2000-09-01
影响因子：
1.9
通讯作者：
Tewfik, M
中科院分区：
文献类型：
--
作者：
Hess, RF;Dakin, SC;Tewfik, M
已经知道一段时间了，单个字母的中心凹和周边视力都高于连续字母的视力。早期的工作表明，这是由于相邻轮廓之间的破坏性相互作用(称为轮廓相互作用)。它被认为有神经基础，并提出了许多相互竞争的解释，涉及视觉加工的高级或低级别阶段。我们之前关于中心凹视觉的结果提出了一个简单得多的解释，这主要是由刺激的物理学决定的，而不是视觉系统的生理学。我发现，在轮廓相互作用或拥挤的条件下，字母最相关的物理空间频带被移位到更高的空间频率，中心凹视觉跟踪空间尺度的变化。然而，在外围，超过5度，物理解释是不够的。在这里，我们表明，存在真正的生理横向空间相互作用，这是由于分析的空间尺度的变化。(C)2000年美国光学学会[S0740-3232(00)01708-7]OCIS编码：330.6130、330.6110、330.1070、330.5020。
It has been known for some time that both foveal and peripheral visual acuity are higher for single letters than for letters in a row. Early work showed that this was due to the destructive interaction of adjacent contours (termed contour interaction). It has been assumed to have a neural basis, and a number of competing explanations have been advanced that implicate either high-level or low-level stages of visual processing. Our previous results for foveal vision suggested a much simpler explanation, one determined primarily by the physics of the stimulus rather than the physiology of the visual system. me show that, under conditions of contour interaction or crowding, the most relevant physical spatial-frequency band of the letter is displaced to higher spatial frequencies and that foveal vision tracks this change in spatial scale. In the periphery, however, beyond 5 degrees, the physical explanation is not sufficient. Here we show that there are genuine physiological lateral spatial interactions, which are due to changes in the spatial scale of analysis. (C) 2000 Optical Society of America [S0740-3232(00)01708-7] OCIS codes: 330.6130, 330.6110, 330.1070, 330.5020.