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Both functional connectivity (FC) and blood oxygen level-dependent (BOLD) signal variability (SD BOLD ) are methods that are used for examining the physiological state of the brain. Although they are derived from signal changes and are related, a few studies have explored their relationship. Here, we examined the relationship between SD BOLD and FC within the default mode network (DMN) in healthy aging participants and those with Parkinson's disease (PD) ON and OFF dopaminergic medications. Dopaminergic medications had profound effects on both DMN FC and SD BOLD measured separately in PD. Analyzing DMN FC and SD BOLD in a joint independent component analysis, we identified joint components of DMN FC and SD BOLD that were separately associated with measurements of motor and cognitive impairment in PD and qualitatively similar to those in healthy aging. Dopaminergic medications had a differential effect on these components depending on these measures of disease severity, "normalizing" the relationships. Importantly, we show that dopaminergic medication status matters in imaging PD, and it can affect both connectivity and SD BOLD . Imaging PD ON may lead to inflated estimates of SD BOLD and diminish the ability to measure changes associated with declining motor and cognitive capacities.

Effect of Dopaminergic Medications on Blood Oxygen Level-Dependent Variability and Functional Connectivity in Parkinson's Disease and Healthy Aging