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Keyword: resting-state brain networks ×Clear all

4 claims from 2 papers

1. Neuroscience › Functional Brain Connectivity Studies

   The Global Signal and Observed Anticorrelated Resting State Brain Networks

   Fox, Zhang, Snyder and Raichle · Journal of Neurophysiology · 2009

   The paper examines the global signal in resting-state fMRI and finds it is truly global, that removing it sharpens correlation maps, and that anticorrelated networks are not just a by-product of removal.

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   1. UncheckedRemoving the global signal from resting-state fMRI data, the authors say, improves detection of system-specific correlations and fit with brain anatomy.“We detail the influence of global signal removal on resting state correlation maps both mathematically and empirically, showing an enhancement in detection of system-specific correlations and improvement in the correspondence between resting-state correlations and anatomy.”
   2. UncheckedSeveral features of anticorrelated resting-state brain networks are not caused by global signal removal, which the authors say suggests a biological basis.“Finally, we show that several characteristics of anticorrelated networks including their spatial distribution, cross-subject consistency, presence with modified whole brain masks, and existence before global regression are not attributable to global signal removal and therefore suggest a biological…”

2. Neuroscience › Functional Brain Connectivity Studies

   Time-resolved resting-state brain networks

   Zalesky, Fornito, Cocchi, Gollo and Breakspear · Proceedings of the National Academy of Sciences · 2014

   Brain networks mapped with fMRI have usually been studied as time averages; the paper argues this oversimplifies, since connectivity fluctuates over time and may save metabolic energy while keeping the brain responsive.

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   1. UncheckedResting brain activity between many pairs of distant regions drifts in and out of correlation together, creating brief intervals of efficient information exchange.“We demonstrate that brain activity between multiple pairs of spatially distributed regions spontaneously fluctuates in and out of correlation over time in a globally coordinated manner, giving rise to sporadic intervals during which information can be efficiently exchanged between neuronal populati…”
   2. UncheckedThe authors argue that shifting brain-network organisation over time may cut metabolic costs while keeping the brain ready to respond.“We argue that dynamic fluctuations in the brain’s organizational properties may minimize metabolic requirements while maintaining the brain in a responsive state.”