p328fig08.49 A directional peak shift in a directional hypercolumn determines the part directions relative to a moving reference frame.<BR>||  What is the mechanism of vector decomposition? (Grossberg, Leveille, Versace 2011). Prediction: directional peak shift! ...specifically, a peak shift due to Gaussian lateral inhibition. [retinal, part, common, relative] motion. shunting dynamics, self-normalization, contrast gain control