The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.
Scale-Free Properties of the Functional Magnetic Resonance Imaging Signal during Rest and Task
Open accessAbstract
It has been shown recently that a significant portion of brain electrical field potentials consists of scale-free dynamics. These scale-free brain dynamics contain complex spatiotemporal structures and are modulated by task performance. Here we show that the fMRI signal recorded from the human brain is also scale free; its power-law exponent differentiates between brain networks and correlates with fMRI signal variance and brain glucose metabolism. Importantly, in parallel to brain electrical field potentials, the variance and power-law exponent of the fMRI signal decrease during task activation, suggesting that the signal contains more long-range memory during rest and conversely is more efficient at online information processing during task. Remarkably, similar changes also occurred in task-deactivated brain regions, revealing the presence of an optimal dynamic range in the fMRI signal. The scale-free properties of the fMRI signal and brain electrical field potentials bespeak their respective stationarity and nonstationarity. This suggests that neurovascular coupling mechanism is likely to contain a transformation from nonstationarity to stationarity. In summary, our results demonstrate the functional relevance of scale-free properties of the fMRI signal and impose constraints on future models of neurovascular coupling.
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Self-citationSlow cortical dynamics and the accumulation of information over long timescales
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Metadata
- Authors
- He, B. J.
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2011-09-28
- Volume
- 31
- Issue
- 39
- Pages
- 13786-13795
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- OpenAlex
- W2021053759
- Cited by
- 435
- References
- 22
- FWCI
- 8.29
- Type
- journal article
- Language
- en
- Open access
- hybrid
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