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FIG 3. A–C, Signal time courses of the left primary sensorimotor cortex around the central sulcus (A), the PMA (B), and the SMA (C), averaged across subjects. Task-related signal changes along the central sulcus are highly specific to contralateral hand motion (A), whereas the nonprimary motor areas are activated by ipsilateral and contralateral hand motion alike. This holds particularly true for the SMA, in which there was no significant difference between the signal changes induced by unilateral or bilateral hand motion. As a result, no task-related signal changes can be observed in paradigm 4 (right versus left-handed finger tapping), apart from small signal peaks associated with changing the side of hand motion
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