Quantitative Estimation of Illusionary Band on the Muller-Lyer Illusion

Muller-Lyer figure was well known as the illusionary figure and it has frequently used with various variations on the studies investigating human visual perception process and mechanisms (e.g., Franz et al., 2001). But few studies attempt to estimate quantitatively how much the difference in size between real and perceptual objects and/or how much the properties of the figure, such as the angle of arrows, affects on such illusionary perception. In this study, the blender-type Muller-Lyer figures were repetitively tested to subjects with changing its figure properties, and the amount of subjective illusionary perception was estimated statistically.