Document Detail


Towards a cognitive neuroscience of consciousness: basic evidence and a workspace framework.
MedLine Citation:
PMID:  11164022     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This introductory chapter attempts to clarify the philosophical, empirical, and theoretical bases on which a cognitive neuroscience approach to consciousness can be founded. We isolate three major empirical observations that any theory of consciousness should incorporate, namely (1) a considerable amount of processing is possible without consciousness, (2) attention is a prerequisite of consciousness, and (3) consciousness is required for some specific cognitive tasks, including those that require durable information maintenance, novel combinations of operations, or the spontaneous generation of intentional behavior. We then propose a theoretical framework that synthesizes those facts: the hypothesis of a global neuronal workspace. This framework postulates that, at any given time, many modular cerebral networks are active in parallel and process information in an unconscious manner. An information becomes conscious, however, if the neural population that represents it is mobilized by top-down attentional amplification into a brain-scale state of coherent activity that involves many neurons distributed throughout the brain. The long-distance connectivity of these 'workspace neurons' can, when they are active for a minimal duration, make the information available to a variety of processes including perceptual categorization, long-term memorization, evaluation, and intentional action. We postulate that this global availability of information through the workspace is what we subjectively experience as a conscious state. A complete theory of consciousness should explain why some cognitive and cerebral representations can be permanently or temporarily inaccessible to consciousness, what is the range of possible conscious contents, how they map onto specific cerebral circuits, and whether a generic neuronal mechanism underlies all of them. We confront the workspace model with those issues and identify novel experimental predictions. Neurophysiological, anatomical, and brain-imaging data strongly argue for a major role of prefrontal cortex, anterior cingulate, and the areas that connect to them, in creating the postulated brain-scale workspace.
Authors:
S Dehaene; L Naccache
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cognition     Volume:  79     ISSN:  0010-0277     ISO Abbreviation:  Cognition     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-02-22     Completed Date:  2001-07-12     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0367541     Medline TA:  Cognition     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1-37     Citation Subset:  IM    
Affiliation:
Unité INSERM 334, Service Hospitalier Frédéric Joliot, CEA/DRM/DSV, 4, Place du Général Leclerc, 91401 Cedex, Orsay, France. dehaene@shfj.cea.fr
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MeSH Terms
Descriptor/Qualifier:
Brain / physiology
Cognition / physiology*
Consciousness / physiology*
Humans
Neurosciences*
Psychological Theory*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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