Mechanisms of directed attention in the human extrastriate cortex as revealed by functional MRI

被引：700
作者：
Kastner, S
De Weerd, P
Desimone, R
Ungerleider, LC
机构：
[1] NIMH, Lab Brain & Cognit, NIH, Bethesda, MD 20892 USA
[2] NIMH, Neuropsychol Lab, NIH, Bethesda, MD 20892 USA
来源：
SCIENCE | 1998年 / 282卷 / 5386期
关键词：
D O I：
10.1126/science.282.5386.108
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
A typical scene contains many different objects, but the capacity of the visual system to process multiple stimuli at a given time is limited, Thus, attentional mechanisms are required to select relevant objects from among the many objects competing for visual processing. Evidence from functional magnetic resonance imaging (MRI) in humans showed that when multiple stimuli are present simultaneously in the visual field, their cortical representations within the object recognition pathway interact in a competitive, suppressive fashion. Directing attention to one of the stimuli counteracts the suppressive influence of nearby stimuli. This mechanism may serve to filter out irrelevant information in cluttered visual scenes.
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收藏
页码：108 / 111
页数：4
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