Distribution of subjects based on cerebral and cerebellar laterality indices (LI). Each subject has been categorized as left lateralized (left), right lateralized (right) or non-lateralized (non) by several LIs: (1) Broca's area, (2) Wernicke's area, (3) combined cerebral (Broca's + Wernicke's areas), and (4) cerebellum. Crossed-cerebrocerebellar lateralization of language is evident.