p303fig08.20 The G-wave speeds up with the distance between flashes at a fixed delay, and has a consitent motion across multiple spatial scales.<BR>||  G-wave properties (Grossberg 1977). Theorem 2 (Equal half-time property) The time at which the motion signal reaches position w=L/2.  Apparent motion speed-up with distance: this half-time is independent of the distance L between the two flashes.  Consistent motion across scales: half-time is independent of the scale size K.  Method of proof: elementary algebra and calculus (Grossberg, Rudd 1989 appendix)