Journal
CEREBRAL CORTEX
Volume 31, Issue 9, Pages 3986-4005Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhab064
Keywords
cortical hierarchy; global signal; infra-slow propagating activity; multimodal neuroimaging
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Funding
- National Institutes of Health Pathway to Independence Award [K99/R00 (5R00NS092996-03)]
- Brain Initiative Award [1RF1MH123247-01]
- National Institutes of Health R01 Award [1R01NS113889-01A1]
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This study found that spontaneous waves in the human and monkey brains propagate along a spatial axis representing cortical hierarchical organization. These cortical propagations are closely related to activity changes in subcortical structures and are modulated across different states of vigilance. The findings demonstrate a neural origin of spatiotemporal fMRI wave propagation at rest and link it to the principal gradient of resting-state fMRI connectivity.
The brain exhibits highly organized patterns of spontaneous activity as measured by resting-state functional magnetic resonance imaging (fMRI) fluctuations that are being widely used to assess the brain's functional connectivity. Some evidence suggests that spatiotemporally coherent waves are a core feature of spontaneous activity that shapes functional connectivity, although this has been difficult to establish using fMRI given the temporal constraints of the hemodynamic signal. Here, we investigated the structure of spontaneous waves in human fMRI and monkey electrocorticography. In both species, we found clear, repeatable, and directionally constrained activity waves coursed along a spatial axis approximately representing cortical hierarchical organization. These cortical propagations were closely associated with activity changes in distinct subcortical structures, particularly those related to arousal regulation, and modulated across different states of vigilance. The findings demonstrate a neural origin of spatiotemporal fMRI wave propagation at rest and link it to the principal gradient of resting-state fMRI connectivity.
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