Static and Dynamic Aspects of CerebroCerebellar Functional Connectivity are Associated with Selfreported Measures of Impulsivity: A RestingState fMRI Study

Human and animal brain studies bring converging evidence on a possible role for the cerebellum and the cerebro-cerebellar system in impulsivity. However, the precise nature of the relation between cerebro-cerebellar coupling and impulsivity is far from understood. Characterizing functional connectivity (FC) patterns between large-scale brain networks, that mediate different forms of impulsivity, and the cerebellum, can improve our understanding of this relation. Here, we analyzed static and dynamic features of cerebro-cerebellar FC using a highly-sampled resting-state functional magnetic resonance imaging (rs-fMRI) dataset and tested their association with two widely-used self-reports of impulsivity: UPPS-P impulsive behavior scale and behavioral inhibition/approach systems (BIS/BAS) in a large group of healthy subjects (N=134, ≈ 1 hour of rs-fMRI/subject). We employed robust data-driven techniques to identify cerebral and cerebellar resting-state networks and extract descriptive summary measures of static and dynamic cerebro-cerebellar FC. We observed evidence linking BIS, BAS, sensation seeking, and lack of premeditation to the total strength and temporal variability of FC within networks connecting regions of the prefrontal cortex, precuneus, posterior cingulate cortex, basal ganglia, and thalamus with the cerebellum. Overall, our findings improve the existing knowledge of the neural correlates of impulsivity and the behavioral correlates of the cerebro-cerebellar system.

Auteurs Bordeaux Neurocampus