Attention and perceptual learning modulate contextual influences on visual perception
Attention and perceptual learning modulate contextual influences on visual perception
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DOI：
10.1016/s0896-6273(00)80499-7
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发表时间：
1998-06-01
期刊：
影响因子：
16.2
通讯作者：
Gilbert, CD
中科院分区：
文献类型：
--
作者：
Ito, M;Westheimer, G;Gilbert, CD
亮度歧视阈值和促进横向相互作用进行了测量，在五个人类观察员和两只猴子。受试者判断四条边缘线中一条的亮度。这个实验是在观察者被提示到测试线的位置（集中注意力）和没有提示时（分散注意力）进行的。集中注意力时的辨别力比分散注意力时的辨别力更好。当测试线有一个共线的侧翼，其亮度增强，这种增强是四倍更突出的分布比集中注意力。训练后，阈值提高，共线易化下降下分布，但不集中注意。研究结果表明，有较少的好处，从上下文交互一旦注意力被导向一个视觉位置，注意力的效果受到训练。
Brightness discrimination thresholds and facilitation by lateral interaction were measured in five human observers and two monkeys. The subjects judged the brightness of one of four peripherally seen lines against a reference. This experiment was performed both when the observer was cued to the position of the test line (focused attention) and when there was no cue (distributed attention). Discrimination was better with focused than with distributed attention. When the test line had a collinear flank, its brightness was enhanced; this enhancement was four ti mes more prominent with distributed than with focused attention. After training, thresholds improved and collinear facilitation decreased under distributed but not under focused attention. The findings show that there are fewer benefits from contextual interaction once attention is directed toward a visual location, and that the attentional effects are subject to training.