In addition, for the slow tapping task, the five periods at the cortical level were defined as: T1 (pre-extension onset period: from 200 ms before the movement onset to movement onset), T2 (postextension onset period: from the movement onset to the end of finger extension), T3 (extension period: during which the index finger remained extended at or above the upper photoelectric sensor), T4 (index finger flexion period: from the start of finger flexion to the movement offset), and T5 (post-flexion offset period: from the movement offset to 200 ms after the movement offset).
