Block design of the experimental protocol.

White squares, stochastic resonance (SR) on-condition (+); gray squares, SR off-condition (-); delay detection task, delayed visual feedback detection task; hand motor tasks, hand motor tasks under delayed visual feedback; BBT, box and block test; NHPT, nine hole peg test. (A) Group A: The 15 participants conducted the task in the order of SR on-condition, off-condition, off-condition, and on-condition. (B) Group B: The other 15 participants conducted the task in the order of SR off-condition, on-condition, on-condition, and off-condition. Prior to the start of the four block procedures, the participants received sensory threshold measurements regardless of the SR conditions.