Metacontrast masking suggests interaction between visual pathways with different spatial and temporal properties
Metacontrast masking suggests interaction between visual pathways with different spatial and temporal properties
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DOI：
10.1016/j.visres.2005.12.013
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发表时间：
2006-06-01
期刊：
影响因子：
1.8
通讯作者：
Sato, Hiromichi
中科院分区：
文献类型：
--
作者：
Ishikawa, Ayako;Shimegi, Satoshi;Sato, Hiromichi
我们研究了使用正弦光栅刺激作为目标和掩模与视觉皮层的功能特性进行定量比较的元对比的时空特性。元对比效应的大小取决于刺激的特征，如目标和掩蔽的方向和空间频率。元对比的特征随刺激起始时间（SOA）而动态变化。在短SOA（0至类似于40 ms）下，后对比度显示出高刺激特征特异性和低对比敏感度，而在长SOA（类似于40至80 ms）下，后对比度显示出低刺激特征特异性和高对比敏感度。我们认为，元对比度是由两个平行的视觉通路之间的相互作用：一个具有低对比敏感度和高特征特异性，另一个具有高对比敏感度和低特征特异性。(c)2006爱思唯尔有限公司版权所有。
We examined the spatiotemporal characteristics of metacontrast using sinusoidal grating stimuli as the target and mask for quantitative comparison with the functional properties of the visual cortex. The magnitude of metacontrast effects depended on the stimulus features such as the orientation and spatial frequency of the target and mask. The characteristics of metacontrast dynamically changed depending on the stimulus onset asynchrony (SOA). At short SOAs (0 to similar to 40 ms), metacontrast exhibited a high stimulus feature specificity and a low contrast sensitivity, whereas at long SOAs (similar to 40 to 80 ms), metacontrast exhibited a low stimulus feature specificity and a high contrast sensitivity. We suggest that metacontrast is explained by the interaction between two parallel visual pathways: one with a low contrast sensitivity and a high feature specificity, and the other with a high contrast sensitivity and a low feature specificity. (c) 2006 Elsevier Ltd. All rights reserved.