Question

Explain what illusory motion is and discuss the different forms of it

Answer 1

Since, we knowledge that the term illusory motion, also known as motion illusion, is an optical illusion in which a static image appears to be moving due to the cognitive effects of interacting color contrasts, object shapes, and position.Apparent motion is the most common type of illusory motion and is perceived when images are displayed in succession at a specific frame rate such as in a movie.

Type of illusory motion.

Basically, the illusory motion can be categorized in the following types, which are...

1). Induced motion
Induced movement works instead by moving the background around a fixed object. Films such as Airplane! and Top Secret! use a fixed prop and move the background props to give the effect of induced motion.

2).Motion aftereffect
Motion aftereffect occurs when one views moving stimuli for an extended period of time and then focus on a stationary object. The object will appear to move in the opposite direction of the moving stimuli.

3).Illusory motion in the eye
Illusory motion is perceived as movement in a number of ways. The first can manifest through the retinal image where the motion flows across the retinal mosaic. The perceived motion can also manifest by the eyes changing position. In either case, an aftereffect may occur.Peripheral drift illusion is another variety of perceived movement in the eye.

4).Illusory motion in the brain
Using an fMRI, Roger B. H. Tootell et al were able to identify the area of the brain that is active when experiencing illusory motion. Tootell and his colleagues had participants view a set of concentric rings that would appear to move inward and outward. Participants would experience a motion aftereffect following the viewing the moving stimuli for 40 seconds. Participants showed an increased activity in the MT area of the brain.