Article (Scientific journals)
Sleep after spatial learning promotes covert reorganization of brain activity
Orban, Pierre; Rauchs, Géraldine; Balteau, Evelyne et al.
2006In Proceedings of the National Academy of Sciences of the United States of America, 103 (18), p. 7124-7129
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Keywords :
Functional MRI; Hippocampus; Sleep deprivation; Memory consolidation; Striatum
Abstract :
[en] Sleep promotes the integration of recently acquired spatial memories into cerebral networks for the long term. In this study, we examined how sleep deprivation hinders this consolidation process. Using functional MRI, we mapped regional cerebral activity during place-finding navigation in a virtual town, immediately after learning and 3 days later, in subjects either allowed regular sleep (RS) or totally sleep-deprived (TSD) on the first posttraining night. At immediate and delayed retrieval, place-finding navigation elicited increased brain activity in an extended hippocamponeocortical network in both RS and TSD subjects. Behavioral performance was equivalent between groups. However, striatal navigation-related activity increased more at delayed retrieval in RS than in TSD subjects. Furthermore, correlations between striatal response and behavioral performance, as well as functional connectivity between the striatum and the hippocampus, were modulated by posttraining sleep. These data suggest that brain activity is restructured during sleep in such a way that navigation in the virtual environment, initially related to a hippocampus-dependent spatial strategy, becomes progressively contingent in part on a response-based strategy mediated by the striatum. Both neural strategies eventually relate to equivalent performance levels, indicating that covert reorganization of brain patterns underlying navigation after sleep is not necessarily accompanied by overt changes in behavior.
Disciplines :
Life sciences: Multidisciplinary, general & others
Author, co-author :
Orban, Pierre ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Rauchs, Géraldine
Balteau, Evelyne ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Degueldre, Christian ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Luxen, André ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie organique de synthèse - Centre de recherches du cyclotron
Maquet, Pierre  ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Peigneux, Philippe ;  Université de Liège - ULiège > Département des sciences cognitives > Département des sciences cognitives
Language :
English
Title :
Sleep after spatial learning promotes covert reorganization of brain activity
Publication date :
02 May 2006
Journal title :
Proceedings of the National Academy of Sciences of the United States of America
ISSN :
0027-8424
eISSN :
1091-6490
Publisher :
National Academy of Sciences, Washington, United States - Washington
Volume :
103
Issue :
18
Pages :
7124-7129
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 January 2013

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