Figure 3.

Regional cerebral blood flow (rCBF) changes with bilateral transcranial direct current stimulation (tDCS) during finger movements. Z-transformed difference images averaged across seven subjects are shown in (A). Activations are shown during finger movements on the nondominant (i and ii) and dominant (iii and iv) hand. Differences are obtained from contrast with the sham rest condition. The red (anode) and blue (cathode) squares drawn on each image correspond to the tDCS electrodes. (B) Mean (±1s.d.) group changes in rCBF during cathodal and anodal stimulation are shown. Individual subjects are represented by the seven different symbols. ^*P<0.05, one-tailed paired t-test.