p316fig08.36 How the directional grouping network, notably properties of the ART Matching Rule, enables a small set of amplified feature tracking signals at the ends of a line to select consistent directions in the line interior, while suppressing inconsistent directions.<BR>||  Motion capture by directional grouping feedback. Directional grouping network (MSTv) <-> Directional long-range filter (MT). It takes longer to capture ambiguous motion signals in the line interior as the length of the line increases cf (Castet etal 1993)