Fig. 1

a System setup. The participant was seated in front of a computer monitor, where imaginary movements provided to him via a virtual hand at rest condition at the lower left corner on the screen. b Experimental timeline for a single block. Here, it shows a block for Task 1 and 2, respectively. In Task1, there was only two hand movements, hand opening and hand closing. While in Task2 there were four cued hand movements within each block. In between the blocks within each task, there was usually a 2–3 min break