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[Low contrast weakens illusory contours but enhances the lightness filling-in of the Kanizsa square]. 2003

Miho Yoshimoto
Department of Psychology, Graduate School of Humanities and Human Sciences, Hiroshima Shudo University, Ozukahigashi, Asaminami-ku, Hiroshima 731-3195.

This study systematically investigated the relationship between the lightness filling-in of the test field and the clarity of illusory contours. The Munsell values of pacmen were N2.5, N3.5, N4.5, N5.5, N6.5 and N7.5, and those of the test field were N3.0, N4.0, N5.0, N6.0 and N7.0, respectively. Seventeen subjects (age: 20-28 yr.) observed 35 stimuli including five control stimuli. The lightness filling-in of the test field increased as the difference in brightness between the test field and pacmen decreased. On the contrary, the clarity of illusory contours decreased as the difference decreased. These results suggest that the lightness filling-in and the clarity of illusory contours have different roots.

UI MeSH Term Description Entries
D008027 Light That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range. Light, Visible,Photoradiation,Radiation, Visible,Visible Radiation,Photoradiations,Radiations, Visible,Visible Light,Visible Radiations
D009903 Optical Illusions An illusion of vision usually affecting spatial relations. Illusion, Optical,Illusions, Optical,Optical Illusion
D005556 Form Perception The sensory discrimination of a pattern, shape, or outline. Contour Perception,Contour Perceptions,Form Perceptions,Perception, Contour,Perception, Form,Perceptions, Contour,Perceptions, Form
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

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