Illusory motion

[1] The stroboscopic animation effect is the most common type of illusory motion and is perceived when images are displayed in fast succession, as occurs in movies.

Motion aftereffect occurs when one views moving stimuli for an extended period of time and then focus on a stationary object.

[7] Beta movement and the phi phenomenon are examples of apparent motion that can be induced with stroboscopic alternation between stimuli at different spots in close proximity of each other.

Beta movement occurs with relatively big differences in position or shape between images at relatively low stroboscopic frequencies, and seems to rely more on cerebral interpretation than on lower neural processing.

The (pure) phi phenomenon occurs at very high stroboscopic frequencies and induces a ghost-like "objectless" motion between or around the alternating figures.

However, a simple demonstration to disprove the idea is to view an apparent counter-rotation (that of a rotating drum) simultaneously with a mirror image.

[10] Apparent motion in optical art has been suggested to be caused by the difference in neural signals between black and white parts of an image.

[citation needed] American neo-psychedelia outfit Animal Collective used an illusory motion on the cover of their award-winning 2009 album Merriweather Post Pavilion.