It is a computer model of the neural correlates of consciousness programmed as a neural network. It attempts to reproduce the swarm behavior[clarification needed] of the brain's higher cognitive functions such as consciousness, decision-making and the central executive functions. It was developped by cognitive neuroscientists Stanislas Dehaene and Jean-Pierre Changeux beginning in 1986. It has been used to provide a predictive framework to the study of inattentional blindness and the solving of the Tower of London test. 
The Dehaene-Changeux Model was initially established as a spin glass neural network attempting to represent learning and to then provide a stepping stone towards artificial learning among other objectives. It would later be used to predict observable reaction times within the priming paradigm and in inattentional blindness.
The Dehaene-Changeux Model is a meta neural network (ie. a network of neural networks) composed of a very large number of integrate-and-fire neurons programmed in either a stochastic or deterministic way. The neurons are organised in complex thalamo-cortical columns with long-range connexions and a critical role[clarification needed] played by the interaction between von Economo's areas. Each thalamo-cortical column is composed of pyramidal cells and inhibitory interneurons receiving a long-distance excitatory neuromodulation which could represent noradrenergic input.
A swarm and a multi-agent system composed of neural networks
Among others Cohen & Hudson (2002) had already used "Meta neural networks as intelligent agents for diagnosis "  Similarly to Cohen & Hudson, Dehaene & Changeux have established their model as an interaction of meta-neural networks (thalamocortical columns) themselves programmed in the manner of a "hierarchy of neural networks that together act as an intelligent agent", in order to use them as a system composed of a large scale of inter-connected intelligent agents for predicting the self-organized behaviour of the neural correlates of consciousness. It may also be noted that Jain et al (2002) had already clearly identified spiking neurons as intelligent agents  since the lower bound for computational power of networks of spiking neurons is the capacity to simulate in real-time for boolean-valued inputs any Turing machine . The DCM being composed of a very large number of interacting sub-networks which are themselves intelligent agents, it is formally a Multi-agent system programmed as a Swarm or neural networks and a fortiori of spiking neurons.
The DCM exhibits several surcritical[clarification needed] emergent behaviors such as multistability and a Hopf bifurcation between two very different regimes which may represent either sleep or arousal with a various all-or-none behaviors which Dehaene et al. use to determine a testable taxonomy between different states of consciousness.[clarification needed]
The Dehaene-Changeux Model contributed to the study of nonlinearity and self-organized criticality in particular as an explanatory model of the brain's emergent behaviors, including consciousness. Studying the brain's phase-locking and large-scale synchronization, Kitzbichler et al (2011a) confirmed that criticality is a property of human brain functional network organization at all frequency intervals in the brain's physiological bandwidth.
Furthermore, exploring the neural dynamics of cognitive efforts after, inter alia, the Dehaene-Changeux Model, Kitzbichler et al (2011b) demonstrated how cognitive effort breaks the modularity of mind to make human brain functional networks transiently adopt a more efficient but less economical configuration. Werner (2007a) used the Dehaene-Changeux Global Neuronal Workspace to defend the use of statistical physics approaches for exploring phase transitions, scaling and universality properties of the do-called "Dynamic Core" of the brain, with relevance to the macroscopic electrical activity in EEG and EMG. Furthermore building from the Dehaene-Changeux Model, Werner (2007b) proposed that the application of the twin concepts of scaling and universality of the theory of non-equilibrium phase transitions can serve as an informative approach for elucidating the nature of underlying neural-mechanisms, with emphasis on the dynamics of recursively reentrant activity flow in intracortical and cortico-subcortical neuronal loops. Friston (2000) also claimed that "the nonlinear nature of asynchronous coupling enables the rich, context-sensitive interactions that characterize real brain dynamics, suggesting that it plays a role in functional integration that may be as important as synchronous interactions".
States of consciousness and phenomenology
It contributed to the study of phase transition in the brain under sedation, and notably GABA-ergic sedation such as that induced by propofol (Murphy et al 2011, Stamatakis et al 2010).  The Dehaene-Changeux Model was contrasted and cited in the study of collective consciousness and its pathologies (Wallace et al 2007). Boly et al (2007) used the model for a reverse somatotopic study, demonstrating a correlation between baseline brain activity and somatosensory perception in humans. Boly et al (2008) also used the DCM in a study of the baseline state of consciousness of the human brain's default network.
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- ^ Dehaene S, Changeux JP. Reward-dependent learning in neuronal networks for planning and decision making. Prog Brain Res. 2000;126:217-29.
- ^ Dehaene S, Changeux JP. Experimental and theoretical approaches to conscious processing. Neuron. 2011 Apr 28;70(2):200-27.
- ^ Changeux JP, Dehaene S. Hierarchical neuronal modeling of cognitive functions: from synaptic transmission to the Tower of London. C R Acad Sci III. 1998 Feb-Mar;321(2-3):241-7.
- ^ Dehaene S, Changeux JP, Nadal JP. Neural networks that learn temporal sequences by selection. Proc Natl Acad Sci U S A. 1987 May;84(9):2727-31.
- ^ Epub 2010 Jan 25. Van den Bussche E, Hughes G, Humbeeck NV, Reynvoet B The relation between consciousness and attention: an empirical study using the priming paradigm. Conscious Cogn. 2010 Mar;19(1):86-97..
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- ^ L. C. Jain, Zhengxin Chen, Nikhil Ichalkaranje Intelligent agents and their applications Volume 98 de Studies in fuzziness and soft computing
- ^ Maas, W. Lower Bound for the computational power of networks of spking neurons 
- ^ Dehaene S, Changeux J-P (2005) Ongoing Spontaneous Activity Controls Access to Consciousness: A Neuronal Model for Inattentional Blindness. PLoS Biol 3(5): e141. doi:10.1371/journal.pbio.0030141 image in full open source
- ^ Dehaene S, Changeux JP, Naccache L, Sackur J, Sergent C. Conscious, preconscious, and subliminal processing: a testable taxonomy. Trends Cogn Sci. 2006 May;10(5):204-11. Epub 2006 Apr 17.
- ^ Kitzbichler MG, Smith ML, Christensen SR, Bullmore E. Broadband criticality of human brain network synchronization. PLoS Comput Biol. 2009 Mar;5(3):e1000314. Epub 2009 Mar 20.
- ^ Kitzbichler MG, Henson RN, Smith ML, Nathan PJ, Bullmore ET. Cognitive effort drives workspace configuration of human brain functional networks. J Neurosci. 2011 Jun 1;31(22):8259-70.
- ^ Werner G. Brain dynamics across levels of organization. J Physiol Paris. 2007 Jul-Nov;101(4-6):273-9. Epub 2008 Jan 8.
- ^ Friston KJ. The labile brain. I . Neuronal transients and nonlinear coupling. Philos Trans R Soc Lond B Biol Sci. 2000 Feb 29;355(1394):215-36.
- ^ Murphy M, Bruno MA, Riedner BA, Boveroux P, Noirhomme Q, Landsness EC, Brichant JF, Phillips C, Massimini M, Laureys S, Tononi G, Boly M.Propofol anesthesia and sleep: a high-density EEG study. Sleep. 2011 Mar 1;34(3):283-91A.
- ^ Stamatakis EA, Adapa RM, Absalom AR, Menon DK. Changes in resting neural connectivity during propofol sedation. PLoS One. 2010 Dec 2;5(12):e14224.
- ^ Wallace RM, Fullilove MT, Fullilove RE, Wallace DN. Collective consciousness and its pathologies: understanding the failure of AIDS control and treatment in the United States. Theor Biol Med Model. 2007 Feb 26;4:10.
- ^ Boly M, Balteau E, Schnakers C, Degueldre C, Moonen G, Luxen A, Phillips C, Peigneux P, Maquet P, Laureys S. Baseline brain activity fluctuations predict somatosensory perception in humans. Proc Natl Acad Sci U S A. 2007 Jul 17;104(29):12187-92. Epub 2007 Jul 6.
- ^ Boly M, Phillips C, Tshibanda L, Vanhaudenhuyse A, Schabus M, Dang-Vu TT, Moonen G, Hustinx R, Maquet P, Laureys S. Intrinsic brain activity in altered states of consciousness: how conscious is the default mode of brain function? Ann N Y Acad Sci. 2008;1129:119-29. Review.
- Dehaene, Stanislaus; Cerebral Bases of the Number Sense in the Parietal Lobe, March 7, 2002. Pinkel Lecture Series, Institute for Research in Cognitive Science, University of Pennsylvania. Audio and transcript.
- "Selected publications of Stanislas Dehaene". INSERM-CEA Cognitive Neuroimaging Unit.
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