New vistas for alpha-frequency band oscillations

Palva, S. and Palva, J. M. (2007) New vistas for alpha-frequency band oscillations. Trends in Neurosciences, 30(4), pp. 150-158. (doi: 10.1016/j.tins.2007.02.001) (PMID:17307258)

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The amplitude of α-frequency band (8–14 Hz) activity in the human electroencephalogram is suppressed by eye opening, visual stimuli and visual scanning, whereas it is enhanced during internal tasks, such as mental calculation and working memory. α-Frequency band oscillations have hence been thought to reflect idling or inhibition of task-irrelevant cortical areas. However, recent data on α-amplitude and, in particular, α-phase dynamics posit a direct and active role for α-frequency band rhythmicity in the mechanisms of attention and consciousness. We propose that simultaneous α-, β- (14–30 Hz) and γ- (30–70 Hz) frequency band oscillations are required for unified cognitive operations, and hypothesize that cross-frequency phase synchrony between α, β and γ oscillations coordinates the selection and maintenance of neuronal object representations during working memory, perception and consciousness.

Item Type:Articles
Additional Information:This work was supported by the Academy of Finland and by the Ella and Georg Ehrnrooth Foundation.
Glasgow Author(s) Enlighten ID:Palva, Professor Satu and Palva, Professor Matias
Authors: Palva, S., and Palva, J. M.
College/School:College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
Journal Name:Trends in Neurosciences
ISSN (Online):1878-108X
Published Online:20 February 2007

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