Spatial attention affects brain activity in human primary visual cortex

被引:498
作者
Gandhi, SP [1 ]
Heeger, DJ [1 ]
Boynton, GM [1 ]
机构
[1] Stanford Univ, Dept Psychol, Stanford, CA 94305 USA
关键词
D O I
10.1073/pnas.96.6.3314
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
Functional MRI was used to test whether instructing subjects to attend to one or another location in a visual scene would affect neural activity in human primary visual cortex. Stimuli were moving gratings restricted to a pair of peripheral, circular apertures, positioned to the right and to the left of a central fixation point. Subjects were trained to perform a motion discrimination task, attending (without mo ting their eyes) at any moment to one of the two stimulus apertures, Functional MRI responses were recorded while subjects Here cued to alternate their attention between the two apertures, Primary visual cortex responses in each hemisphere modulated with the alternation of the cue; responses were greater when the subject attended to the stimuli in the contralateral hemifield, The attentional modulation of the brain activity was about 25% of that evoked by alternating the stimulus with a uniform field.
引用
收藏
页码:3314 / 3319
页数:6
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