title: THE TRAPEZOIDAL ILLUSION AS A FUNCTION OF AGE, INTELLECTUAL STATUS, SIZE CONSTANCY, AND FORM DISCRIMINATION.
mesh_terms: D000293:Adolescent; D000375:Aging; D002648:Child; D005556:Form Perception; D006801:Humans; D007088:Illusions; D008607:Intellectual Disability; D007360:Intelligence; D011603:Psychophysiology; D012858:Size Perception; D014785:Vision, Ocular
keywords: ADOLESCENCE; AGING; CHILD; FORM PERCEPTION; ILLUSIONS; INTELLIGENCE; MENTAL RETARDATION; PSYCHOPHYSIOLOGY; SIZE PERCEPTION; VISION