A neuronal model of a global workspace in effortful cognitive tasks.

@article{citeulike:1274617, abstract = {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.}, address = {Institut National de la Sant\'{e} et de la Recherche M\'{e}dicale, Unit\'{e} 334, Service hospitalier Fr\'{e}d\'{e}ric Joliot, Commissariat \`{a} l'\'{e}nergie atomique, 4 Place du G\'{e}n\'{e}ral Leclerc, 91401 Orsay, France. dehaene@shfj.cea.fr}, author = {Dehaene, S. and Kerszberg, M. and Changeux, J. P. }, citeulike-article-id = {1274617}, doi = {http://dx.doi.org/10.1073/pnas.95.24.14529}, issn = {0027-8424}, journal = {Proc Natl Acad Sci U S A}, keywords = {conscious}, month = {November}, number = {24}, pages = {14529--14534}, posted-at = {2007-05-03 21:17:50}, priority = {2}, title = {A neuronal model of a global workspace in effortful cognitive tasks.}, url = {http://dx.doi.org/10.1073/pnas.95.24.14529}, volume = {95}, year = {1998} }

TY - JOUR ID - citeulike:1274617 L3 - citeulike-article-id:1274617 TI - A neuronal model of a global workspace in effortful cognitive tasks. JF - Proc Natl Acad Sci U S A VL - 95 IS - 24 SP - 14529 EP - 14534 AD - Institut National de la Santé et de la Recherche Médicale, Unité 334, Service hospitalier Frédéric Joliot, Commissariat à l'énergie atomique, 4 Place du Général Leclerc, 91401 Orsay, France. dehaene@shfj.cea.fr SN - 0027-8424 N2 - 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. KW - conscious AU - Dehaene, S AU - Kerszberg, M AU - Changeux, JP PY - 1998/11/24/ UR - http://dx.doi.org/10.1073/pnas.95.24.14529 ER -