Figure 1.

Nondominant cortical activity varies by callosal organization. a, Top, During word encoding (all conditions vs baseline), LIPFC activity was observed across all participants. No corresponding RIPFC activity was observed. b, Bottom left, Although both high- (red color scale) and low-callosal organization (green color scale) groups exhibit LIPFC activity during verbal encoding, only the low-callosal organization group exhibits homologous RIPFC activity. Bottom right, Changes in signal amplitude (in percent) during verbal encoding in the LIPFC (−53, 16, 24) and RIPFC (53, 15, 19) ROIs for the high- and low-callosal organization groups. Error bars indicate SEM.