Figure 2.

fMRI evidence of overlapping activity during voluntary PFM and voluntary GMM activation. A, fMRI data were collected while participants performed three separate runs identical to the EMG tasks: separate repeated voluntary activation of PFM (run 1), GMM (run 2), and FDI (run 3). B, Contrast of voluntary FDI activation greater than voluntary PFM activation produced significant brain activation in left sensorimotor cortex. C, Contrast of voluntary PFM activation greater than voluntary FDI activation produced significant activation in the medial wall of the precentral gyrus. D, Contrast of voluntary GMM activation greater than voluntary FDI activation produced significant activation in the medial wall of the precentral gyrus E, Anterior medial wall of the precentral gyrus exhibited significant brain activation for both PFM activation and GMM activation compared with FDI activation.