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Inhibitory Cerebellar Stimulation Increases Cortical Activation: Evidence for Cerebellar Scaffolding of Cortical Processing

While the cerebellum makes known contributions to non-motor task performance, the role of the structure remains unknown. One possibility is that the cerebellum allows for the offloading of cortical processing, providing support during task performance, using internal models. The current work used transcranial direct current stimulation to modulate cerebellar function and investigate the impact on cortical activation patterns. Participants received stimulation over the right cerebellum before a functional magnetic resonance imaging scan where participants completed a sequence learning and a working memory task. We predicted that cathodal stimulation would improve, and anodal stimulation would hinder task performance and cortical activation. We found that anodal cerebellar stimulation resulted in increased bilateral cortical activation, particularly in parietal and frontal regions known to be involved in cognitive processing. This suggests that if the cerebellum is not functioning optimally, there is a greater need for cortical resources.