Nurture versus nature: long-term impact of forced right-handedness on structure of pericentral cortex and basal ganglia.

Détails

ID Serval
serval:BIB_ACC6CFA65B81
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Nurture versus nature: long-term impact of forced right-handedness on structure of pericentral cortex and basal ganglia.
Périodique
The Journal of neuroscience
Auteur⸱e⸱s
Klöppel S., Mangin J.F., Vongerichten A., Frackowiak R.S., Siebner H.R.
ISSN
1529-2401 (Electronic)
ISSN-L
0270-6474
Statut éditorial
Publié
Date de publication
03/03/2010
Peer-reviewed
Oui
Volume
30
Numéro
9
Pages
3271-3275
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Does a conflict between inborn motor preferences and educational standards during childhood impact the structure of the adult human brain? To examine this issue, we acquired high-resolution T1-weighted magnetic resonance scans of the whole brain in adult "converted" left-handers who had been forced as children to become dextral writers. Analysis of sulcal surfaces revealed that consistent right- and left-handers showed an interhemispheric asymmetry in the surface area of the central sulcus with a greater surface contralateral to the dominant hand. This pattern was reversed in the converted group who showed a larger surface of the central sulcus in their left, nondominant hemisphere, indicating plasticity of the primary sensorimotor cortex caused by forced use of the nondominant hand. Voxel-based morphometry showed a reduction of gray matter volume in the middle part of the left putamen in converted left-handers relative to both consistently handed groups. A similar trend was found in the right putamen. Converted subjects with at least one left-handed first-degree relative showed a correlation between the acquired right-hand advantage for writing and the structural changes in putamen and pericentral cortex. Our results show that a specific environmental challenge during childhood can shape the macroscopic structure of the human basal ganglia. The smaller than normal putaminal volume differs markedly from previously reported enlargement of cortical gray matter associated with skill acquisition. This indicates a differential response of the basal ganglia to early environmental challenges, possibly related to processes of pruning during motor development.

Mots-clé
Adaptation, Physiological/physiology, Adult, Basal Ganglia/anatomy & histology, Basal Ganglia/physiology, Brain Mapping, Dominance, Cerebral/physiology, Female, Functional Laterality/physiology, Humans, Hypertrophy, Learning/physiology, Magnetic Resonance Imaging, Male, Middle Aged, Motor Cortex/anatomy & histology, Motor Cortex/physiology, Motor Skills/physiology, Movement/physiology, Neuronal Plasticity/physiology, Neuropsychological Tests, Putamen/anatomy & histology, Putamen/physiology, Writing, Young Adult
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/03/2010 16:47
Dernière modification de la notice
20/08/2019 16:16
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