Document Detail


Information Sharing in the Brain Indexes Consciousness in Noncommunicative Patients.
MedLine Citation:
PMID:  24076243     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Neuronal theories of conscious access tentatively relate conscious perception to the integration and global broadcasting of information across distant cortical and thalamic areas [1-6]. Experiments contrasting visible and invisible stimuli support this view and suggest that global neuronal communication may be detectable using scalp electroencephalography (EEG) [3, 5-11]. However, whether global information sharing across brain areas also provides a specific signature of conscious state in awake but noncommunicating patients remains an active topic of research [12-15]. We designed a novel measure termed "weighted symbolic mutual information" (wSMI) and applied it to 181 high-density EEG recordings of awake patients recovering from coma and diagnosed in various states of consciousness. The results demonstrate that this measure of information sharing systematically increases with consciousness state, particularly across distant sites. This effect sharply distinguishes patients in vegetative state (VS), minimally conscious state (MCS), and conscious state (CS) and is observed regardless of etiology and delay since insult. The present findings support distributed theories of conscious processing and open up the possibility of an automatic detection of conscious states, which may be particularly important for the diagnosis of awake but noncommunicating patients.
Authors:
Jean-Rémi King; Jacobo D Sitt; Frédéric Faugeras; Benjamin Rohaut; Imen El Karoui; Laurent Cohen; Lionel Naccache; Stanislas Dehaene
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-9-25
Journal Detail:
Title:  Current biology : CB     Volume:  -     ISSN:  1879-0445     ISO Abbreviation:  Curr. Biol.     Publication Date:  2013 Sep 
Date Detail:
Created Date:  2013-9-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9107782     Medline TA:  Curr Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier Ltd. All rights reserved.
Affiliation:
Cognitive Neuroimaging Unit, Institut National de la Santé et de la Recherche Médicale, U992, 91191 Gif/Yvette, France; NeuroSpin Center, Institute of BioImaging Commissariat à l'Energie Atomique, 91191 Gif/Yvette, France; Institut du Cerveau et de la Moelle Épinière Research Center, Institut National de la Santé et de la Recherche Médicale, U975, 75013 Paris, France. Electronic address: jeanremi.king@gmail.com.
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