Figure 1.

Experimental Protocol. Both motor tasks were acquired following the same systematic order as shown on top of this figure’s diagram. (A) Modified isometric pinch force task (FORCE) required subjects to control a force sensor with their left thumb and index finger to move a cursor to a series of target zones, as fast and accurately as possible. (B) The sequential finger tapping task (SEQTAP) required subjects to repeatedly tap a fixed five element sequence with their left hand, as fast and accurately as possible on a keyboard.