Spatial attention affects brain activity in human primary visual cortex
Spatial attention affects brain activity in human primary visual cortex
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DOI：
10.1073/pnas.96.6.3314
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发表时间：
1999-03-16
影响因子：
11.1
通讯作者：
Boynton, GM
中科院分区：
文献类型：
--
作者：
Gandhi, SP;Heeger, DJ;Boynton, GM
功能性核磁共振用于测试指导受试者注意视觉场景中的一个或另一个位置是否会影响人类初级视觉皮层的神经活动。刺激物是限制在一对外围圆形孔内的移动光栅，位于中心固定点的右侧和左侧。训练受试者执行运动辨别任务，随时注意（不移动眼睛）两个刺激孔之一，记录功能性 MRI 反应，同时提示受试者在两个孔之间交替注意力，每个半球的初级视觉皮层反应随着提示的交替而调节；当受试者注意对侧半视野中的刺激时，反应更大。大脑活动的注意力调节约为均匀场交替刺激引起的注意力调节的 25%。
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.