Literature DB >> 17030821

A beta2-frequency (20-30 Hz) oscillation in nonsynaptic networks of somatosensory cortex.

Anita K Roopun1, Steven J Middleton, Mark O Cunningham, Fiona E N LeBeau, Andrea Bibbig, Miles A Whittington, Roger D Traub.   

Abstract

Beta2 frequency (20-30 Hz) oscillations appear over somatosensory and motor cortices in vivo during motor preparation and can be coherent with muscle electrical activity. We describe a beta2 frequency oscillation occurring in vitro in networks of layer V pyramidal cells, the cells of origin of the corticospinal tract. This beta2 oscillation depends on gap junctional coupling, but it survives a cut through layer 4 and, hence, does not depend on apical dendritic electrogenesis. It also survives a blockade of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors or a blockade of GABA(A) receptors that is sufficient to suppress gamma (30-70 Hz) oscillations in superficial cortical layers. The oscillation period is determined by the M type of K+ current.

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Year:  2006        PMID： 17030821      PMCID： PMC1592532          DOI： 10.1073/pnas.0607443103

Source DB:  PubMed          Journal:  Proc Natl Acad Sci U S A        ISSN： 0027-8424            Impact factor:   11.205


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