@article {308692,
	title = {Reversal of cortical information flow during visual imagery as compared to visual perception.},
	journal = {Neuroimage},
	volume = {100},
	year = {2014},
	note = {http://www.sciencedirect.com/science/article/pii/S1053811914004662$\#$},
	month = {2014 Oct 15},
	pages = {237-43},
	abstract = {<p>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.</p>},
	keywords = {Adult, Brain Mapping, Cerebral Cortex, Electroencephalography, Female, Humans, Imagination, Male, Models, Statistical, Visual perception, Young Adult},
	issn = {1095-9572},
	doi = {10.1016/j.neuroimage.2014.05.081},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/24910071},
	author = {Dentico, Daniela and Cheung, Bing Leung and Chang, Jui-Yang and Guokas, Jeffrey and Boly, Melanie and Tononi, Giulio and Van Veen, Barry}
}
