Experimental paradigm.

<p>Functional scanning incorporated with three independent runs: two rest runs (rest 1 and rest 2), each lasting 6 min, were separated by a 5.5 min block-designed run and a 5 min stimulation period. The block-designed scanning included two cycles, 1 min stimulation (S1 and S2) and a 1 min rest epoch, preceded by a 1.5 min rest period as baseline (BL). Immediately after the block-designed run, the same modality of stimulation was continued for 5 min without scanning.