The neural basis of biased competition in human visual cortex

被引:339
作者
Kastner, S
Ungerleider, LG
机构
[1] Princeton Univ, Dept Psychol, Ctr Study Brain Mind & Behav, Princeton, NJ 08544 USA
[2] NIMH, Lab Brain & Cognit, NIH, Bethesda, MD 20892 USA
关键词
competition; visual cortex; neural basis;
D O I
10.1016/S0028-3932(01)00116-6
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
A typical scene contains many different objects that compete for neural representation due to the limited processing capacity of the visual system. At the neural level, competition among multiple stimuli is evidenced by the mutual suppression of their visually evoked responses and occurs most strongly at the level of the receptive field. The competition among multiple objects can be biased by both bottom-up sensory-driven mechanisms and top-down influences, such as selective attention. Functional brain imaging studies reveal that biasing signals due to selective attention can modulate neural activity in visual cortex not only in the presence, but also in the absence of visual stimulation. Although the competition among stimuli for representation is ultimately resolved within visual cortex, the source of top-down biasing signals likely derives from a distributed network of areas in frontal and parietal cortex. Attention-related activity in frontal and parietal areas does not reflect attentional modulation of visually evoked responses, but rather the attentional operations themselves. Published by Elsevier Science Ltd.
引用
收藏
页码:1263 / 1276
页数:14
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