Unconscious processing of orientation and color without primary visual cortex
Unconscious processing of orientation and color without primary visual cortex
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DOI：
10.1073/pnas.0505332102
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发表时间：
2005-11-15
影响因子：
11.1
通讯作者：
Ro, T
中科院分区：
文献类型：
--
作者：
Boyer, JL;Harrison, S;Ro, T
在人类中，初级视觉皮层（V1）对有意识的视觉至关重要。然而，即使没有V1，在没有意识的情况下，一些保留的准确响应视觉输入的能力已经被证明，这种现象被称为盲视。我们使用经颅磁刺激（TMS）去激活V1，对出现在中央凹、TMS诱导的暗点中的视觉目标产生短暂失明。尽管不知道这些目标，表现在强迫选择歧视任务的方向（实验1）和颜色（实验2）都显着高于机会。除了证明TMS可以成功地用于在正常人群中诱导盲视之外，这些结果还表明，一种功能性的膝状体外纹视觉通路绕过V1，可以在没有意识的情况下处理方向和颜色。
In humans, the primary visual cortex (V1) is essential for conscious vision. However, even without V1 and in the absence of awareness, some preserved ability to accurately respond to visual inputs has been demonstrated, a phenomenon referred to as blindsight. We used transcranial magnetic stimulation (TMS) to deactivate V1, producing transient blindness for visual targets presented in a foveal, TMS-induced scotoma. Despite unawareness of these targets, performance on forced choice discrimination tasks for orientation (experiment 1) and color (experiment 2) were both significantly above chance. In addition to demonstrating that TMS can be successfully used to induce blindsight within a normal population, these results suggest a functioning geniculoextrastriate visual pathway that bypasses V1 and can process orientation and color in the absence of conscious awareness.