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Proc Natl Acad Sci U S A. 2006 Jan 10;103(2):455-9. Epub 2005 Dec 30.

Synchronous dynamic brain networks revealed by magnetoencephalography.

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  • 1The Domenici Research Center for Mental Illness, Brain Sciences Center, Veterans Affairs Medical Center, Minneapolis, MN 55417, USA.

Abstract

We visualized synchronous dynamic brain networks by using prewhitened (stationary) magnetoencephalography signals. Data were acquired from 248 axial gradiometers while 10 subjects fixated on a spot of light for 45 s. After fitting an autoregressive integrative moving average model and taking the residuals, all pairwise, zero-lag, partial cross-correlations (PCC(ij)(0)) between the i and j sensors were calculated, providing estimates of the strength and sign (positive and negative) of direct synchronous coupling between neuronal populations at a 1-ms temporal resolution. Overall, 51.4% of PCC(ij)(0) were positive, and 48.6% were negative. Positive PCC(ij)(0) occurred more frequently at shorter intersensor distances and were 72% stronger than negative ones, on the average. On the basis of the estimated PCC(ij)(0), dynamic neural networks were constructed (one per subject) that showed distinct features, including several local interactions. These features were robust across subjects and could serve as a blueprint for evaluating dynamic brain function.

PMID:
16387850
[PubMed - indexed for MEDLINE]
PMCID:
PMC1324790
Free PMC Article
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