Early visual brain areas reflect the percept of an ambiguous scene
Early visual brain areas reflect the percept of an ambiguous scene
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DOI：
10.1073/pnas.0810966105
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发表时间：
2008-12-23
影响因子：
11.1
通讯作者：
Hari, Riitta
中科院分区：
文献类型：
--
作者：
Parkkonen, Lauri;Andersson, Jesper;Hari, Riitta
当视觉场景允许多种解释时，尽管稳定的视网膜图像和不变的感觉输入被传输到大脑，但感知可能自发地交替。为了研究这种多稳态感知的大脑基础，我们将快速变化的动态噪声作为区域标签叠加到Rubin花瓶脸图形上，并用脑磁图跟踪相应的标签相关皮质信号。在最早的视觉皮质区域，包括初级视觉皮质，活动已经随着观察者报告的感知状态而变化。这些知觉相关的调节很可能反映了自上而下的影响，这种影响强调了早期视觉皮质中感知对象的神经表征，并保持了对象与背景的分离。
When a visual scene allows multiple interpretations, the percepts may spontaneously alternate despite the stable retinal image and the invariant sensory input transmitted to the brain. To study the brain basis of such multi-stable percepts, we superimposed rapidly changing dynamic noise as regional tags to the Rubin vase-face figure and followed the corresponding tag-related cortical signals with magnetoencephalography. The activity already in the earliest visual cortical areas, the primary visual cortex included, varied with the perceptual states reported by the observers. These percept-related modulations most likely reflect top-down influences that accentuate the neural representation of the perceived object in the early visual cortex and maintain the segregation of objects from the background.