Different target motion paths relative to a canonical movement field. The starting positions of moving targets (T1ini) were pseudorandomly selected among locations situated along the same imaginary lines used for the targets during static trials. Target motion could be radial (A, inward or outward relative to fixation target T0), vertical (B, upward or downward relative to T1ini, motion along an axis parallel to and different from the vertical meridian) or horizontal (C, rightward or leftward motion along an axis parallel to and different from the horizontal meridian).