Figure 4.

Examples showing right hand voluntary movements by a blindfolded subject to touch the right index tip to the left index tip when the left hand was moved by the experimenter (NVP condition). Position of the left index tip (target—moved by the experimenter) and right index tip (moved voluntarily by the subject—dashed lines) in 3D space are shown relative to the start position of the left index tip. The vertical lines indicate onset (greens) of left fingertip motion, onset of right fingertip motion, (reds) end of left fingertip motion and end of right fingertip motion. Note that the voluntarily moved right fingertip began motion at variable times after the left fingertip and that the two fingertips stopped moving at about the same time. (A) The left index was moved horizontally toward the right fingertip. (B) The left index was moved obliquely upward. (C) The left index was moved almost straight upward. (D) The left index was moved obliquely toward the subject.