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Canadian Association of Neurosciences Review: Postnatal Development of the Mammalian Neocortex: Role of Activity Revisited

Published online by Cambridge University Press:  02 December 2014

Zhong-wei Zhang
Zhong-wei Zhang*
Affiliation:
Centre de recherche Université Laval Robert-Giffard, Department of Psychiatry, Laval University School of Medicine, Québec, QC
*
Centre de recherche Université Laval Robert-Giffard, 2601, de la canardière, F-6500, Quebec, QC G1J 2G3, Canada.
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Abstract:

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The mammalian neocortex is the largest structure in the brain, and plays a key role in brain function. A critical period for the development of the neocortex is the early postnatal life, when the majority of synapses are formed and when much of synaptic remodeling takes place. Early studies suggest that initial synaptic connections lack precision, and this rudimentary wiring pattern is refined by experience-related activity through selective elimination and consolidation. This view has been challenged by recent studies revealing the presence of a relatively precise pattern of connections before the onset of sensory experience. The recent data support a model in which specificity of neuronal connections is largely determined by genetic factors. Spontaneous activity is required for the formation of neural circuits, but whether it plays an instructive role is still controversial. Neurotransmitters including acetylcholine, serotonin, and γ-Aminobutyric acid (GABA) may have key roles in the regulation of spontaneous activity, and in the maturation of synapses in the developing brain.

Résumé:

RÉSUMÉ:

Le néocortex des mammifères est la plus grosse structure du cerveau et il joue un rôle stratégique dans la function cérébrale. La période postnatale est critique pour son développement. La majorité des synapses se forment à ce moment-là ainsi qu’une grande partie du remodelage synaptique. Plusieurs études ont suggéré que les connections synaptiques initiales manquent de précision et que ce « câblage » rudimentaire du cerveau est raffiné par l’activité reliée à l’expérience, par élimination et consolidation sélective. Cette notion a été remise en question parce que des études récentes ont démontré la présence de motifs relativement précis de connections avant le début de l’expérience sensorielle. Les données récentes sont en faveur d’un modèle où la spécificité des connections neuronales est déterminée en grande partie par des facteurs génétiques. L’activité spontanée est requise pour la formation de circuits neuraux, mais son rôle informatif demeure controversé. Des neurotransmetteurs comme l’acétylcholine, la sérotonine et l’acide g-aminobutyrique (GABA) pourraient jouer un rôle important dans la régulation de l’activité spontanée et dans la maturation des synapses du cerveau en développement.

Type
Review Article
Information
Canadian Journal of Neurological Sciences , Volume 33 , Issue 2 , May 2006 , pp. 158 - 169
Copyright
Copyright © The Canadian Journal of Neurological 2006

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