Figure 12.

Screen-shot of the game, which is similar to Guitar Hero^®. The green target was controlled by the index finger, the yellow target by the middle finger, and the blue target by both fingers together. The other two targets were not used. As subjects move a finger, a corresponding dark ball moves along the fret board. The desired locations of the fingers are displayed by fixed circles on the fret board that stream towards the bottom of the screen. To hit a note, the subjects were required to move the ball to the fixed desired position at the time the streaming note passes through it. After hitting a note, the subjects must return the finger(s) to neutral position in order to hit the upcoming notes.