Figure 4: (a) Brain regions activated by the EX addition task in the abacus-trained group (contrasted to the nontrained group). (b) Comparison of the mean beta values of these brain regions between groups. Uppercase letters in the parenthesis represent these brain regions. (A): thalamus; (B): superior temporal lobule; (C): caudate; (D): MPFC; (E): right angular. (, FDR corrected; Voxel sizes > 30).