与视觉感知相比，视觉表象过程中皮质信息流的反转。
Reversal of cortical information flow during visual imagery as compared to visual perception.
作者信息
Dentico Daniela, Cheung Bing Leung, Chang Jui-Yang, Guokas Jeffrey, Boly Melanie, Tononi Giulio, Van Veen Barry
机构信息
Department of Psychiatry, University of Wisconsin-Madison, 6001 Research Park Blvd, Madison, WI 53719, USA.
Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, USA.
出版信息
Neuroimage. 2014 Oct 15;100:237-43. doi: 10.1016/j.neuroimage.2014.05.081. Epub 2014 Jun 6.
The role of bottom-up and top-down connections during visual perception and the formation of mental images was examined by analyzing high-density EEG recordings of brain activity using two state-of-the-art methods for assessing the directionality of cortical signal flow: state-space Granger causality and dynamic causal modeling. We quantified the directionality of signal flow in an occipito-parieto-frontal cortical network during perception of movie clips versus mental replay of the movies and free visual imagery. Both Granger causality and dynamic causal modeling analyses revealed an increased top-down signal flow in parieto-occipital cortices during mental imagery as compared to visual perception. These results are the first direct demonstration of a reversal of the predominant direction of cortical signal flow during mental imagery as compared to perception.
通过使用两种评估皮质信号流方向的先进方法，即状态空间格兰杰因果关系法和动态因果模型，分析大脑活动的高密度脑电图记录，研究了自下而上和自上而下连接在视觉感知和心理图像形成过程中的作用。我们量化了枕顶叶-额叶皮质网络在观看电影片段、电影心理回放以及自由视觉想象过程中信号流的方向。格兰杰因果关系分析和动态因果模型分析均显示，与视觉感知相比，心理成像过程中顶枕叶皮质的自上而下信号流增加。这些结果首次直接证明，与感知相比，心理成像过程中皮质信号流的主要方向发生了逆转。
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