Cerebellar changes related to musical instrument experience [partial modification from [179]. (a) Older musicians had higher bilateral GMVs in the cerebellum than non-musicians. (b) For the cerebellar ROIs, the non-musicians demonstrated a negative correlation between their GMV and age, whereas such correlation was not significant. ** P < 0.01, *** P < 0.001. CB-L, left cerebellum; CB-R, right cerebellum; GMV, gray matter volume; ROI, region of interest; a.u., arbitrary units