Everything about The Ebbinghaus Illusion totally explained
The
Ebbinghaus illusion is an
optical illusion of relative size perception. In the best-known version of the illusion, two circles of identical size are placed near to each other and one is surrounded by large circles while the other is surrounded by small circles; the first central circle then appears smaller than the second central circle.
It was named for its discoverer, the German psychologist
Hermann Ebbinghaus (1850-1909).
The Ebbinghaus illusion has played a crucial role in the recent debate over the existence of separate pathways in the brain for perception and action (for more details see
visual cortex). It has been argued that the Ebbinghaus illusion distorts
perception of size, but when a subject is required to respond with an
action, such as grasping, no size distortion occurs (Goodale & Milner, 1992). However, recent work (Franz
et al., 2005) suggests that the original experiments were flawed. The original stimuli limited the possibility for error in the grasping action, therefore making the grasp response more accurate, and presented the large and small versions of the stimulus in isolation--which results in
no illusion because there's no second central circle to act as a reference. Franz
et al. conclude that both the action and perception systems are equally fooled by the Ebbinghaus illusion.
References
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