p340fig09.07 Log polar remapping from the retina to cortical area V1 and beyond converts expansion, translation, and spiral flows on the retina into parallel flows, with different orientations, on the cortical map.<BR>||  Log polar remapping of optic flow.  retina -> cortex.  Any combination of expansion and circular motion centered on the fovea maps to cortex as a single direction.  Retinal Cartesian coordinates (x,y) map to cortical polar coordinates (r,theta).  This makes it easy to compute directional receptive fields in the cortex!