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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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Perceptions and Actions Are Brain-State Dependent

Perceptions and Actions Are Brain-State Dependent

Chapter:
(p.262) Cycle 10 Perceptions and Actions Are Brain-State Dependent
Source:
Rhythms of the Brain
Author(s):

Buzsáki György

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195301069.003.0010

The variation of our motor and cognitive abilities is present at multiple time scales, expanding from periods of tens of milliseconds to hours. The brain-state variability to a large extent is internally coordinated even in the waking brain. This internal coordination is not simply “correlated noise.” Instead, the time-evolving brain states are an important source of mental operations. A brain's current state is, in part, dependent on a prior one. In order to predict the state of a neuronal network, one needs to have access to its recent history. The 1/f brain dynamic is often reflected by a similar 1/f scale freedom of overt behaviors, such as various mental operations and motor outputs. From this perspective, the neuronal “signal” in response to a given environmental perturbation of the brain state is not an initial condition but, rather, a modification of a perpetually evolving network pattern in the brain's landscape.

Keywords:   state, arousal, attention, context, averaged response, noise, evoked activity, phase reset

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