Figure 8. Compensatory activation increases in the action selection network after left dorsal premotor cortex rTMS.

1Hz (inhibitory) rTMS of left dorsal premotor cortex results in increased activation (BOLD signal) most prominently in right dorsal premotor cortex (rPMd) and right cingulate motor area (rCMA). Changes were also seen in the left supplementary motor area (lSMA), the left cingulate motor area (lCMA), and right primary motor cortex (rM1). The figures show the mean percent BOLD signal change (% BSC) when subjects performed the action selection (black bars) or the control action execution (white bars) tasks. Note that the TMS-induced activation increases occur only with action selection. (Modified with permission from O’Shea et al, 2007).