Figure 1.

fMRI design. Brushing stimuli were delivered during two runs: one brushing the palm and one brushing the back of the hand. Each run contained 4 blocks: 2 fast brushing blocks (30 cm/s) and 2 slow brushing blocks (3 cm/s). Each block had 8 6 s periods of brushing with rest periods jittered around 15 s. Each block was followed by a 16 s rating period: 8 s for rating intensity and 8 s for rating pleasantness. The order of the two runs was counterbalanced across subjects and the order of the four blocks was randomized within each run.