Dehaene–Changeux model: Difference between revisions
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The '''Dehaene-Changeux Model''' ('''DCM''') also known as the '''Global Neuronal Workspace''' or the '''Global Cognitive Workspace Model''' as a part of [[Bernard Baars]]'s "[[Global workspace theory |Global Workspace model]]" for consciousness is a [[Computer model | computer model]] of the [[Neural correlates of consciousness]] programmed as a [[Neural network | neural network]]. An attempt to reproduce the swarm behavior of the [[Brain | brain]]'s ''higher cognitive functions'' such as [[Consciousness]], [[Decision-making | decision-making]] <ref> Dehaene S, Changeux JP. '''Reward-dependent learning in neuronal networks for planning and decision making.''' Prog Brain Res. 2000;126:217-29. </ref> and the central [[Executive functions | executive functions]] it was developped by cognitive neuroscientists [[Stanislas Dehaene]] and [[Jean-Pierre Changeux]] from 1986 to present. <ref> Dehaene S, Changeux JP. '''Experimental and theoretical approaches to conscious processing.''' Neuron. 2011 Apr 28;70(2):200-27. </ref> It was used to provide a predictive framework to the study of [[inattentional blindness]] and the solving of the [[Tower of London test]]. <ref> 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. </ref> <ref> 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.</ref> |
The '''Dehaene-Changeux Model''' ('''DCM''') also known as the '''Global Neuronal Workspace''' or the '''Global Cognitive Workspace Model''' as a part of [[Bernard Baars]]'s "[[Global workspace theory |Global Workspace model]]" for consciousness is a [[Computer model | computer model]] of the [[Neural correlates of consciousness]] programmed as a [[Neural network | neural network]]. An attempt to reproduce the swarm behavior of the [[Brain | brain]]'s ''higher cognitive functions'' such as [[Consciousness]], [[Decision-making | decision-making]] <ref> Dehaene S, Changeux JP. '''Reward-dependent learning in neuronal networks for planning and decision making.''' Prog Brain Res. 2000;126:217-29. </ref> and the central [[Executive functions | executive functions]] it was developped by cognitive neuroscientists [[Stanislas Dehaene]] and [[Jean-Pierre Changeux]] from 1986 to present. <ref> Dehaene S, Changeux JP. '''Experimental and theoretical approaches to conscious processing.''' Neuron. 2011 Apr 28;70(2):200-27. </ref> It was used to provide a predictive framework to the study of [[inattentional blindness]] and the solving of the [[Tower of London test]]. <ref> 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. </ref> <ref> 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.</ref> |
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The Dehaene-Changeux Model (DCM) also known as the Global Neuronal Workspace or the Global Cognitive Workspace Model as a part of Bernard Baars's "Global Workspace model" for consciousness is a computer model of the Neural correlates of consciousness programmed as a neural network. An attempt to reproduce the swarm behavior of the brain's higher cognitive functions such as Consciousness, decision-making [1] and the central executive functions it was developped by cognitive neuroscientists Stanislas Dehaene and Jean-Pierre Changeux from 1986 to present. [2] It was used to provide a predictive framework to the study of inattentional blindness and the solving of the Tower of London test. [3] [4]
History
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 [5] and in inattentional blindness.
Structure
The Dehaene-Changeux Model is a system 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 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.
![](http://upload.wikimedia.org/wikipedia/en/0/0c/Dehaene_%26_Changeux_2005_PLOS_%28ccreative_commons%29.png)
Behavior
The DCM exhibits several surcritical emergent behaviors such as mulstistability 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 [7]
Scholarly Reception
Self-organized criticality
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) from the University of Cambridge confirmed that criticality is a property of human brain functional network organization at all frequency intervals in the brain's physiological bandwidth [8]. 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. [9] Werner (2007a) resorted to 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. [10]. 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" [11]
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) [12] [13]. The Dehaene-Changeux Model was contrasted and cited in the study of collective consciousness and its pathologies (Wallace et al 2007) [14]. Boly et al (2007) used the model for a reverse somatotopic study, demonstrating a correlation between baseline brain activity and somatosensory perception in humans [15]. Boly et al (2008) also used the DCM in a study of the baseline state of consciousness of the human brain's default network. [16]
Publications
- Naccache, L. Cognitive aging considered from the point of view of cognitive neurosciences of consciousness. Psychologie & NeuroPsychiatrie du vieillissement. Volume 5, Number 1, 17-21, Mars 2007
- Rialle, V and Stip, E. Cognitive modeling in psychiatry: from symbolic models to parallel and distributed models J Psychiatry Neurosci. 1994 May; 19(3): 178–192.
- Ravi Prakash, Om Prakash, Shashi Prakash, Priyadarshi Abhishek, and Sachin Gandotra Global workspace model of consciousness and its electromagnetic correlatesAnn Indian Acad Neurol. 2008 Jul-Sep; 11(3): 146–153. doi: 10.4103/0972-2327.42933
- Zigmond, Michael J.(1999) Fundamental neuroscience, Academic Press p1551
- Bernard J. Baars,Nicole M. Gage Cognition, brain, and consciousness: introduction to cognitive neuroscience Academic Press, 2010 p. 287
- Carlos Hernández, Ricardo Sanz, Jaime Gomez, Jaime Gómez-Ramirez, Leslie S. Smith, Amir Hussain, Antonio Chella, Igor Aleksander, Jaime G Mez-Ramirez From Brains to Systems: Brain-Inspired Cognitive Systems Volume 718 of Advances in Experimental Medicine and Biology Series Springer, 2011 p. 230
- Steven Laureys et al. The boundaries of consciousness: neurobiology and neuropathology Volume 150 of Progress in brain research Elsevier, 2006 p. 45
- Michael S. Gazzaniga The cognitive neurosciences MIT Press, 2004 p.1146
- Stanislas Dehaene The cognitive neuroscience of consciousness MIT Press 2001 p.13
- Tim Bayne, Axel Cleeremans, Patrick Wilken The Oxford companion to consciousness Oxford Universty Press 2009 p.332
- Hans Liljenström, Peter Århem Consciousness transitions: phylogenetic, ontogenetic, and physiological aspects Elsevier 2008 p. 126
Internet links
- 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.
See Also
References
- ^ 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..
- ^ 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.