title: A quantitative analysis of illusion magnitude changes induced by rotation of contextual distractor.
abstract: In the present study, the predictions of the computational model of centroid extraction were verified in psychophysical examination of the length illusion induced by stimuli comprising the conventional or asymmetric Müller-Lyer wings as the contextual distractors. In experiments, the illusion magnitude changes evoked by rotation of distractors with different spatial parameters were quantitatively determined. It was demonstrated that the model calculations adequately account for the illusion magnitude variations shown by all the subjects for all modifications of stimuli. A good correspondence between the experimental and theoretical data supports the suggestion that local positional biases caused by the neural processes of automatic centroid extraction can be one of the main reasons of emergence of illusions of the Müller-Lyer type.
authors.affiliation: Laboratory of Visual Neurophysiology, Lithuanian University of Health Sciences, Kaunas, Lithuania; Email: bulatov@vision.lsmuni.lt.|Institute of Biological Systems and Genetics Research, Lithuanian University of Health Sciences, Kaunas, Lithuania.
authors.forename: Aleksandr
authors.initials: A
authors.lastname: Bulatov
authors.affiliation: Institute of Biological Systems and Genetics Research, Lithuanian University of Health Sciences, Kaunas, Lithuania.
authors.forename: Natalija
authors.initials: N
authors.lastname: Bulatova
authors.affiliation: Laboratory of Visual Neurophysiology, Lithuanian University of Health Sciences, Kaunas, Lithuania.|Institute of Biological Systems and Genetics Research, Lithuanian University of Health Sciences, Kaunas, Lithuania.
authors.forename: Tadas
authors.initials: T
authors.lastname: Surkys
authors.affiliation: Institute of Biological Systems and Genetics Research, Lithuanian University of Health Sciences, Kaunas, Lithuania.
authors.forename: Lina
authors.initials: L
authors.lastname: Mickienė
mesh_terms: D003198:Computer Simulation; D006801:Humans; D009903:Optical Illusions / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics / Q000379:methods; D012399:Rotation; D013223:Statistics as Topic / Q000379:methods