Physiological Changes in Sleep That Affect FMRI Inference

Overview

Journal Curr Opin Behav Sci

Date 2020 Jul 3

PMID 32613032

Citations 15

Authors

Jeff H Duyn

Pinar S Ozbay

Catie Chang

Dante Picchioni

Affiliations

Soon will be listed here.

Abstract

fMRI relies on a localized cerebral blood flow (CBF) response to changes in cortical neuronal activity. An underappreciated aspect however is its sensitivity to contributions from autonomic physiology that may affect CBF through changes in vascular resistance and blood pressure. As is reviewed here, this is crucial to consider in fMRI studies of sleep, given the close linkage between the regulation of arousal state and autonomic physiology. Typical methods for separating these effects are based on the use of reference signals that may include physiological parameters such as heart rate and respiration; however, the use of time-invariant models may not be adequate due to the possibly changing relationship between reference and fMRI signals with arousal state. In addition, recent research indicates that additional physiological reference signals may be needed to accurately describe changes in systemic physiology, including sympathetic indicators such as finger skin vascular tone and blood pressure.

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