Fig. 1.

A: a schematic representation of the experimental setup. B: the computer feedback provided to the participants for the maximum voluntary contraction (MVC) tasks. The participants were asked to produce their maximum force within a 5-s window (vertical black lines). C: the computer feedback provided to the participants for the single-finger ramp tasks. The black line was shown as a template to the participants. D: the computer feedback provided to the participants for the one-finger and four-finger rhythmic tasks. The participants were asked to accurately produce forces (F) between the two dashed lines and use the solid lines as buffer zones.