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Rhythms of the Brain$
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György Buzsáki

Print publication date: 2006

Print ISBN-13: 9780195301069

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780195301069.001.0001

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A System of Rhythms: From Simple to Complex Dynamics

A System of Rhythms: From Simple to Complex Dynamics

Chapter:
(p.111) Cycle 5 A System of Rhythms: From Simple to Complex Dynamics
Source:
Rhythms of the Brain
Author(s):

Buzsáki György

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195301069.003.0005

Neuronal networks in the mammalian cortex generate several distinct oscillatory bands. These neuronal oscillators are linked to the much slower metabolic oscillators. The mean frequencies of the experimentally observed oscillator categories form a linear progression on a natural logarithmic scale with a constant ratio between neighboring frequencies. Because the ratios of the mean frequencies of the neighboring cortical oscillators are not integers, adjacent bands cannot linearly phase-lock. Oscillators of different bands couple with shifting phases and give rise to a state of perpetual fluctuation between unstable and transient stable phase synchrony. The resulting interference dynamics are a fundamental feature of the global temporal organization of the cerebral cortex. Although brain states are highly labile, neuronal avalanches are prevented by oscillatory dynamics. Scale-free dynamics generate complexity, whereas oscillations allow for temporal predictions. Dynamics in the cerebral cortex constantly alternate between the most complex metastable state and the highly predictable oscillatory state.

Keywords:   slow oscillations, circadian rhythms, interference, oscillator coupling, pink noise, power spectrum, Weber law, scale-free organization, metastability, 1/f dynamics

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