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  • 1
    Publication Date: 2011-05-14
    Description: Frontoparietal cortex is involved in the explicit processing (awareness) of stimuli. Frontoparietal activation has also been found in studies of subliminal stimulus processing. We hypothesized that an impairment of top-down processes, involved in recurrent neuronal message-passing and the generation of long-latency electrophysiological responses, might provide a more reliable correlate of consciousness in severely brain-damaged patients, than frontoparietal responses. We measured effective connectivity during a mismatch negativity paradigm and found that the only significant difference between patients in a vegetative state and controls was an impairment of backward connectivity from frontal to temporal cortices. This result emphasizes the importance of top-down projections in recurrent processing that involve high-order associative cortices for conscious perception.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boly, Melanie -- Garrido, Marta Isabel -- Gosseries, Olivia -- Bruno, Marie-Aurelie -- Boveroux, Pierre -- Schnakers, Caroline -- Massimini, Marcello -- Litvak, Vladimir -- Laureys, Steven -- Friston, Karl -- 088130/Wellcome Trust/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2011 May 13;332(6031):858-62. doi: 10.1126/science.1202043.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Coma Science Group, Cyclotron Research Centre and Neurology Department, University of Liege and CHU Sart Tilman Hospital, 4000 Liege, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; Aged, 80 and over ; Auditory Perception ; Awareness ; Bayes Theorem ; Brain Mapping ; *Consciousness ; Electroencephalography ; *Evoked Potentials, Auditory ; Female ; Frontal Lobe/physiology/*physiopathology ; Humans ; Male ; Middle Aged ; Models, Neurological ; Models, Statistical ; Neural Pathways ; Parietal Lobe/physiology/*physiopathology ; Persistent Vegetative State/diagnosis/*physiopathology ; Reaction Time ; Temporal Lobe/physiology/*physiopathology ; Young Adult
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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