Binocular component
slightly different images bc eyes are apart. Cyclopean fusion in V1 brings them together
Motion
Processed in V5, different images on retina in short time makes you perceive motion
Aperture problem
Many different combinations of speed may elicit same perception of motion
Apparent motion
Phi-phenomenon. Similar images closely n time give illusion of movement.
Motion aftereffect
Perceiving movement in opposite direction when looking away after looking for long time.