Effects of training: voxel-based analysis. A–C, SPMs showing significant interaction (n = 2, fixed effects, p < 0.001) tool action versus hand action observation, relative to their static control, for rake (A), pliers (B) and screwdriver (C) observation before training, after rake training, and after pliers training. The significant voxels (orange-yellow) are overlaid on flatmaps of the left hemisphere of monkey M12.