Reversal of cortical information flow during visual imagery as compared to visual perception.

Reversal of cortical information flow during visual imagery as compared to visual perception.
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与视觉感知相比,视觉图像过程中皮质信息流的逆转。

DOI:
10.1016/j.neuroimage.2014.05.081
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发表时间:
2014-10-15
期刊:
影响因子:
5.7
通讯作者:
Van Veen B
Van Veen B
中科院分区:
医学1区
文献类型:
--
作者:
Dentico D;Cheung BL;Chang JY;Guokas J;Boly M;Tononi G;Van Veen B

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The role of bottom-up and top-down connections during visual perception and the forming 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 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.
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