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dc.contributor.authorRoopun, Anita K.en_US
dc.contributor.authorKramer, Mark A.en_US
dc.contributor.authorCarracedo, Lucy M.en_US
dc.contributor.authorKaiser, Marcusen_US
dc.contributor.authorDavies, Ceri H.en_US
dc.contributor.authorTraub, Roger D.en_US
dc.contributor.authorKopell, Nancy J.en_US
dc.contributor.authorWhittington, Miles A.en_US
dc.date.accessioned2012-01-09T14:57:56Z
dc.date.available2012-01-09T14:57:56Z
dc.date.copyright2008en_US
dc.date.issued2008-04-08en_US
dc.identifier.citationRoopun, Anita K., Mark A. Kramer, Lucy M. Carracedo, Marcus Kaiser, Ceri H. Davies, Roger D. Traub, Nancy J. Kopell, Miles A. Whittington. "Period Concatenation Underlies Interactions Between Gamma and Beta Rhythms in Neocortex" Frontiers in Cellular Neuroscience 2 (2008)en_US
dc.identifier.issn1662-5102en_US
dc.identifier.urihttp://hdl.handle.net/2144/2798
dc.description.abstractThe neocortex generates rhythmic electrical activity over a frequency range covering many decades. Specific cognitive and motor states are associated with oscillations in discrete frequency bands within this range, but it is not known whether interactions and transitions between distinct frequencies are of functional importance. When coexpressed rhythms have frequencies that differ by a factor of two or more interactions can be seen in terms of phase synchronization. Larger frequency differences can result in interactions in the form of nesting of faster frequencies within slower ones by a process of amplitude modulation. It is not known how coexpressed rhythms, whose frequencies differ by less than a factor of two may interact. Here we show that two frequencies (gamma - 40Hz and beta2 - 25Hz), coexpressed in superficial and deep cortical laminae with low temporal interaction, can combine to generate a third frequency (beta1 - 15Hz) showing strong temporal interaction. The process occurs via period concatenation, with basic rhythm-generating microcircuits underlying gamma and beta2 rhythms forming the building blocks of the beta1 rhythm by a process of addition. The mean ratio of adjacent frequency components was a constant - approximately the golden mean - which served to both minimize temporal interactions, and permit multiple transitions, between frequencies. The resulting temporal landscape may provide a framework for multiplexing - parallel information processing on multiple temporal scales.en_US
dc.description.sponsorshipMedical Research Council; The Wolfson Foundation; National Institutes of Health; The Royal Societyen_US
dc.language.isoenen_US
dc.publisherFrontiers Research Foundationen_US
dc.rightsCopyright 2008 Roopun, Kramer, Carracedo, Kaiser, Davies, Traub, Kopell and Whittington. This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.en_US
dc.rights.urihttp://www.frontiersin.org/licenseagreementen_US
dc.subjectNeocortexen_US
dc.subjectGamma rhythmen_US
dc.subjectBeta rhythmen_US
dc.subjectInhibitionen_US
dc.titlePeriod Concatenation Underlies Interactions Between Gamma and Beta Rhythms in Neocortexen_US
dc.typearticleen_US
dc.identifier.doi10.3389/neuro.03.001.2008en_US
dc.identifier.pubmedid18946516en_US
dc.identifier.pmcid2525927en_US


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