Figure 4.

(a) GUIs for the static (left) and dynamic (right) mini-games. The score for the mini-game provides participants whether the current user’s response is correct or not. Additionally, the red block of the dynamic condition is only shown during the demonstration to supplement the ideal timing window for response. The white box represents the arm position that moves along three boxes that correspond the arm’s range of motion. From (b) to (d) are examples of testing of the static (flexor muscle contracted), dynamic, and static (extensor muscle contracted) conditions, respectively.