Attentional load modulates responses of human primary visual cortex to invisible stimuli.
Attentional load modulates responses of human primary visual cortex to invisible stimuli.
复制标题
注意力负载调节人类原代视皮对无形刺激的反应。
DOI：
10.1016/j.cub.2007.01.070
复制
发表时间：
2007-03-20
期刊：
影响因子：
9.2
通讯作者：
Rees, Geraint
中科院分区：
文献类型：
--
作者：
Bahrami, Bahador;Lavie, Nilli;Rees, Geraint
视觉神经科学长期以来一直试图确定视觉皮层中刺激诱发的活动在多大程度上取决于注意力和意识。一些有影响力的意识理论认为，注意力的分配仅限于有意识的表征。然而，在注意负荷理论中，任务相关和任务无关刺激对有限注意能力的竞争并不依赖于对无关刺激的有意识感知。关键的测试是在相关任务中的注意力负荷水平是否会决定无形刺激的无意识神经处理。人类参与者在进行低或高注意力负荷的中央凹任务时进行高场fMRI扫描。不相关的，看不见的单眼刺激，同时提出了周边，并不断抑制闪烁的面具在另一只眼睛。中心凹任务中的注意负荷强烈地调制由不可见刺激引起的初级视皮层（V1）的视网膜视标活动。与传统观点相反，我们发现注意力能力的可用性决定了与人类初级视觉皮质中持续抑制刺激的无意识处理相关的神经表征。注意力溢出到皮质表征的无形刺激（在低负荷下）不能成为他们意识到的充分条件。
Visual neuroscience has long sought to determine the extent to which stimulus-evoked activity in visual cortex depends on attention and awareness. Some influential theories of consciousness maintain that the allocation of attention is restricted to conscious representations. However, in the load theory of attention, competition between task-relevant and task-irrelevant stimuli for limited-capacity attention does not depend on conscious perception of the irrelevant stimuli. The critical test is whether the level of attentional load in a relevant task would determine unconscious neural processing of invisible stimuli. Human participants were scanned with high-field fMRI while they performed a foveal task of low or high attentional load. Irrelevant, invisible monocular stimuli were simultaneously presented peripherally and were continuously suppressed by a flashing mask in the other eye. Attentional load in the foveal task strongly modulated retinotopic activity evoked in primary visual cortex (V1) by the invisible stimuli. Contrary to traditional views, we found that availability of attentional capacity determines neural representations related to unconscious processing of continuously suppressed stimuli in human primary visual cortex. Spillover of attention to cortical representations of invisible stimuli (under low load) cannot be a sufficient condition for their awareness.
登录
查看更多内容
影响因子：
2.3
作者：
Mandler, G
通讯作者：
Mandler, G
影响因子：
25
作者：
O'Connor, DH;Fukui, MM;Kastner, S
通讯作者：
Kastner, S
影响因子：
64.8
作者：
Dehaene, S;Naccache, L;Le Bihan, D
通讯作者：
Le Bihan, D
影响因子：
2.6
作者：
Chun, MM;Jian, YH
通讯作者：
Jian, YH
影响因子：
25
作者：
Silvanto, J;Cowey, A;Walsh, V
通讯作者：
Walsh, V