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Exp Brain Res. 2010 Apr;201(4):719-27. doi: 10.1007/s00221-009-2086-9. Epub 2009 Nov 27.

Long-range synchronization and local desynchronization of alpha oscillations during visual short-term memory retention in children.

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1
Department of Pediatrics, University of British Columbia, L408-4480 Oak Street, Vancouver, BC, V6R 3V4, Canada. sdoesburg@cw.bc.ca

Abstract

Local alpha-band synchronization has been associated with both cortical idling and active inhibition. Recent evidence, however, suggests that long-range alpha synchronization increases functional coupling between cortical regions. We demonstrate increased long-range alpha and beta band phase synchronization during short-term memory retention in children 6-10 years of age. Furthermore, whereas alpha-band synchronization between posterior cortex and other regions is increased during retention, local alpha-band synchronization over posterior cortex is reduced. This constitutes a functional dissociation for alpha synchronization across local and long-range cortical scales. We interpret long-range synchronization as reflecting functional integration within a network of frontal and visual cortical regions. Local desynchronization of alpha rhythms over posterior cortex, conversely, likely arises because of increased engagement of visual cortex during retention.

PMID:
19943040
PMCID:
PMC2840055
DOI:
10.1007/s00221-009-2086-9
[Indexed for MEDLINE]
Free PMC Article
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