The task objective is to synchronize the arrival of two rectangles (“Target A” and “Target B”) to a line. Both rectangles start the task stationary, in the same vertical position (near the left edge of the screen) and move horizontally, from left to right, towards a line located near the right edge of the computer screen. Target A begins its movement between 1.5 and 3 seconds (pseudo-randomly) after the start of the task, and Target B is set in motion when the participant presses the switch.
Target A can move at three different speeds and participants can choose which of them to practice by pressing keys 1, 2, or 3 on the keyboard before each trial. When the participant presses one of these keys, the trial will begin immediately. At speeds 1, 2, and 3, the viewing time of Target A in motion will be 2790, 2490, and 2180 ms, respectively. In turn, the movement of Target B on the screen takes 1060 ms.