Human visual cortex responds to invisible chromatic flicker
Human visual cortex responds to invisible chromatic flicker
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DOI：
10.1038/nn1879
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发表时间：
2007-05-01
影响因子：
25
通讯作者：
He, Sheng
中科院分区：
文献类型：
--
作者：
Jiang, Yi;Zhou, Ke;He, Sheng
当两种等光色以25赫兹或更高的频率交替时，观察者只能感知到一种融合的颜色。超出融合频率的彩色闪烁在人类观察者中诱导闪烁适应，并刺激猴子的V1神经元。在这里，我们使用功能磁共振成像(FMRI)来显示，除了VO，人类的许多视觉皮质区域可以区分融合的彩色闪烁及其匹配的非闪烁对照。这一结果支持了高频色度信息在皮层内存在显著的时间滤波。这一结果还表明，在许多视觉皮质区域，皮质激活的相当大的差异并不一定会导致不同的意识体验。
When two isoluminant colors alternate at frequencies of 25 Hz or higher, observers perceive only one fused color. Chromatic flicker beyond the fusion frequency induces flicker adaptation in human observers and stimulates monkey V1 neurons. Here we use functional magnetic resonance imaging ( fMRI) to show that many human visual cortical areas, with the exception of VO, can distinguish between fused chromatic flicker and its matched nonflickering control. This result supports the existence of significant intracortical temporal filtering of high-frequency chromatic information. The result also suggests that a considerable difference in cortical activation in many visual cortical areas does not necessarily lead to different conscious experiences.