Given a scene on two different occasions with different tasks goals, same low-level process applied Process applied is mostly independent of specific object knowledge Motion perception uses assumption about the continuity and rigidity of objects but not that it is a pen or a hat. The use of rigidity in the perception of motion is present at the age of 5 months.
Correspondence is simplest if eyes are fixating directly on object.
Solve the correspondence problem over a temporal sequence of images 1. One 3-D object can project an infinity of possible images on a 2D retina. 1.Smooth Continuation, 2.Cotermination, 3. Symmetry Complex entities invite decomposition into simple parts.