Figure 1.

Target hand movement directions are shown relative to the table located in front of the subject and are shown from the subject's front view (A) and top view (B). The target (left) hand started with the index tip on the cylinder containing a switch and was moved when the experimenter said “Go.” The pointing (right) hand started with the index tip on a small round mark on the table that could be felt by the subject. The pointing hand was moved when the subject heard a beep sound at random times, between 50 and 300 ms, after start of movement of the target hand.