p302fig08.17 An important constraint on whether long-rang apparent motion occurs is whether the Gaussian kernel is broad enough to span the distance between successive flashes.<BR>||  Motion speed-up with increasing distance:  For a fixed ISI, how does perceived velocity increase with distance between the flashes?  Gaussian filter : Gp = exp{ -(j-i)^2 / (2*K^2) }.  The largest separation, L_crit, for which sufficient spatial overlap between two Gaussians centered at locations i and j will exist to support a travelling wave of summed peak activity is : L_crit = 2*K