Center-of-mass alterations in the Oppel-Kundt illusion A Bulatov, A Gutauskas, N Bulatova, L Mickiene |
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Institute for Biological Systems and Genetics, Lithuanian University of Health Sciences, Lithuania
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| In the present communication, the predictions of our computational model of automatic centroid extraction [Bulatov et al., 2009, Acta Neurobiologiae Experimentalis 69(4), 504-525] have been checked by the results of psychophysical study of the Oppel-Kundt illusion. It has been tested in experiments whether the illusion magnitude can be varied by altering the position of additional non-target spots placed in proximity of stimulus terminators: it was expected that such center-of-mass manipulations should affect the neural computation of perceived length and either increase or decrease the illusion magnitude in comparison with that for unaltered form of the Oppel-Kundt figure. A good correspondence between the model predictions and the illusion magnitude changes provides evidence supporting the suggestion that processes of automatic centroid extraction are certainly linked (although do not determine completely) to the emergence of the Oppel-Kundt illusion. It was shown also that the changes of the illusion magnitude obtained in the present study are commensurate with those established in our previous studies of illusions of extent of the Müller-Lyer type. |
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