p345fig09.15 Double opponent directional receptive fields in MT are capable of detecting the motion of objects relative to each other and their backgrounds.<BR>||  Motion opponency in MT (Born, Tootell 1992). Motion opponent (Grossberg etal), Differential motion (Royden etal), Subtractive motion cells (Neumann etal).  ON center directionally selective: [excit, inhibit]ed by motion in [one, opponent] direction.  OFF surround directionally selective: [excit, inhibit]ed by motion in [opponent, center] direction.