p341fig09.08 How the various optic flows on the retina are mapped through V1m MT, and MSTd to then compute heading in parietal cortex was modeled by (Grossberg, Mingolia, Pack 1999), using the crucial transformation via V1 log polar mapping into parallel cortical flow fields.<BR>||  MSTd model (Grossberg, Mingolia, Pack 1999). Retinal motion -> V1 log polar mapping -> Each MT Gaussian RF sums motion in preferred direction -> Each MSTd cell sums MT cell inputs with same log polar direction -> Efference copy subtracts rotational flow from MSTd cells.