Experimental and Theoretical Approaches to Conscious Processing

Stanislas Dehaene, Jean-Pierre Changeux
2011 Neuron  
Recent experimental studies and theoretical models have begun to address the challenge of establishing a causal link between subjective conscious experience and measurable neuronal activity. The present review focuses on the well-delimited issue of how an external or internal piece of information goes beyond non-conscious processing and gains access to conscious processing, a transition characterized by the existence of a reportable subjective experience. Converging neuroimaging and
more » ... ogical data, acquired during minimal experimental contrasts between conscious and non-conscious processing point to objective neural measures of conscious access: late amplification of relevant sensory activity, long-distance cortico-cortical synchronisation at beta and gamma frequencies, and "ignition" of a large-scale prefronto-parietal network. We confront these findings to current theoretical models of conscious processing, including the Global Neuronal Workspace (GNW) model according to which conscious access occurs when incoming information is made globally available to multiple brain systems through a network of neurons with long-range axons densely distributed in prefrontal, parieto-temporal and cingulate cortices. The clinical implications of these results for general anesthesia, coma, vegetative state and schizophrenia are discussed.
doi:10.1016/j.neuron.2011.03.018 pmid:21521609 fatcat:rxvewhrgg5cfvgoipr6x4vjpze