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- W3048656223 startingPage "782" @default.
- W3048656223 abstract "Ultra-slow, ∼0.1-Hz variations in the oxygenation level of brain blood are widely used as an fMRI-based surrogate of resting-state neuronal activity. The temporal correlations among these fluctuations across the brain are interpreted as for maps and neurological diagnostics. Ultra-slow variations in oxygenation follow a cascade. First, they closely track changes in arteriole diameter. Second, interpretable functional connections arise when the ultra-slow changes in amplitude of γ-band neuronal oscillations, which are shared across even far-flung but synaptically connected brain regions, entrain the ∼0.1-Hz vasomotor oscillation in diameter of local arterioles. Significant confounds to estimates of functional connectivity arise from residual vasomotor activity as well as arteriole dynamics driven by self-generated movements and subcortical common modulatory inputs. Last, methodological limitations of fMRI can lead to spurious functional connections. The neuronal generator of ultra-slow variations in γ-band amplitude, including that associated with self-generated movements, remains an open issue." @default.
- W3048656223 created "2020-08-18" @default.
- W3048656223 creator A5010434115 @default.
- W3048656223 creator A5038554858 @default.
- W3048656223 creator A5040802400 @default.
- W3048656223 creator A5067546640 @default.
- W3048656223 creator A5090082626 @default.
- W3048656223 date "2020-09-01" @default.
- W3048656223 modified "2023-10-13" @default.
- W3048656223 title "Ultra-slow Oscillations in fMRI and Resting-State Connectivity: Neuronal and Vascular Contributions and Technical Confounds" @default.
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