Biomaterial Database

[Effects of luminance contrast and color contrast between components of illusory figure on the illusion magnitude]. 1993

K Guo, and C Y Li

Department of Sensory Information Processing, Shanghai Institute of Physiology, Chinese Academy of Sciences.

Using quantitative psychophysical measurements, the effects of luminance contrast (LC) and equiluminance color contrast (ECC) between components of illusory figures on the magnitudes of orientation illusion (Zoellner illusion), length illusion (Müller-Lyer illusion and Ponzo illusion) and area illusion (Delboeuf illusion) were investigated. The results showed that, compared with normal illusory magnitude, the illusory magnitude of the subjects decreased obviously when LC or ECC existed between the components of the illusory figures. The decrease was especially obvious in the orientation illusion. The minimum contrasts for inducing contour and border illusions were only 1.8% and 5.3% under LC. They increased to 66.0% and 46.4% respectively when both luminance and color contrasts were introduced into the figures. These observations provided evidence for the existence of mutual inhibition between the luminance, color and form channels of the visual system.

UI	MeSH Term	Description	Entries
D008029	Lighting	The illumination of an environment and the arrangement of lights to achieve an effect or optimal visibility. Its application is in domestic or in public settings and in medical and non-medical environments.	Illumination
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D009903	Optical Illusions	An illusion of vision usually affecting spatial relations.	Illusion, Optical,Illusions, Optical,Optical Illusion
D010364	Pattern Recognition, Visual	Mental process to visually perceive a critical number of facts (the pattern), such as characters, shapes, displays, or designs.	Recognition, Visual Pattern,Visual Pattern Recognition
D003118	Color Perception	Mental processing of chromatic signals (COLOR VISION) from the eye by the VISUAL CORTEX where they are converted into symbolic representations. Color perception involves numerous neurons, and is influenced not only by the distribution of wavelengths from the viewed object, but also by its background color and brightness contrast at its boundary.	Color Perceptions,Perception, Color,Perceptions, Color
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D015350	Contrast Sensitivity	The ability to detect sharp boundaries (stimuli) and to detect slight changes in luminance at regions without distinct contours. Psychophysical measurements of this visual function are used to evaluate VISUAL ACUITY and to detect eye disease.	Visual Contrast Sensitivity,Sensitivity, Contrast,Sensitivity, Visual Contrast