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A Neuronal Model of a Global Workspace in Effortful Cognitive Tasks

Dehaene, Stanislas ; Kerszberg, Michel ; Changeux, Jean-Pierre

Proceedings of the National Academy of Sciences - PNAS, 1998-11, Vol.95 (24), p.14529-14534 [Periódico revisado por pares]

United States: National Academy of Sciences of the United States of America

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Título:
A Neuronal Model of a Global Workspace in Effortful Cognitive Tasks
Autor: Dehaene, Stanislas ; Kerszberg, Michel ; Changeux, Jean-Pierre
Assuntos: Architecture ; Behavioral neuroscience ; Biological Sciences ; Brain ; Brain - physiology ; Brain Mapping ; Cerebral Cortex - physiology ; Cognition & reasoning ; Cognition - physiology ; Computer Simulation ; Connectivity ; Humans ; Inks ; Memory ; Models, Neurological ; Motor ability ; Nerve Net - physiology ; Neural Networks (Computer) ; Neurobiology ; Neuroimaging ; Neurology ; Neurons ; Prefrontal cortex ; Time Factors ; Work
É parte de: Proceedings of the National Academy of Sciences - PNAS, 1998-11, Vol.95 (24), p.14529-14534
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To whom reprint requests should be addressed. e-mail dehaene@shfj.cea.fr.
Contributed by Jean-Pierre Changeux
Descrição: A minimal hypothesis is proposed concerning the brain processes underlying effortful tasks. It distinguishes two main computational spaces: a unique global workspace composed of distributed and heavily interconnected neurons with long-range axons, and a set of specialized and modular perceptual, motor, memory, evaluative, and attentional processors. Workspace neurons are mobilized in effortful tasks for which the specialized processors do not suffice. They selectively mobilize or suppress, through descending connections, the contribution of specific processor neurons. In the course of task performance, workspace neurons become spontaneously coactivated, forming discrete though variable spatio-temporal patterns subject to modulation by vigilance signals and to selection by reward signals. A computer simulation of the Stroop task shows workspace activation to increase during acquisition of a novel task, effortful execution, and after errors. We outline predictions for spatio-temporal activation patterns during brain imaging, particularly about the contribution of dorsolateral prefrontal cortex and anterior cingulate to the workspace.
Editor: United States: National Academy of Sciences of the United States of America
Idioma: Inglês

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A Neuronal Model of a Global Workspace in Effortful Cognitive Tasks

Dehaene, Stanislas ; Kerszberg, Michel ; Changeux, Jean-Pierre

United States: National Academy of Sciences of the United States of America

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