title: Illusions within an Illusion.
abstract: Effect of perceptual inversion on illusion figures seen monocularly was explored using Ponzo and Muller-Lyer stimuli. It was found that inversion nullified the Ponzo effect but not the Muller-Lyer effect. This suggests that the determinants of the two illusory effects differ in their origin.
authors.affiliation: School of Psychology, University of Aberdeen, Scotland, UK j.b.deregowski@abdn.ac.uk.
authors.forename: Jan B
authors.initials: JB
authors.lastname: Deręgowski
mesh_terms: D000328:Adult; D001288:Attention; D004193:Discrimination Learning; D004215:Distance Perception / Q000502:physiology; D006801:Humans; D009903:Optical Illusions; D009949:Orientation; D011601:Psychophysics; D012858:Size Perception; D015348:Vision, Binocular; D015349:Vision, Monocular
keywords: Muller-Lyer illusion; Ponzo illusion; perception of depth; perceptual reversals