Psikhologicheskie Issledovaniya • ISSN 2075-7999
peer-reviewed • open access journal


Karpinskaya V.J., Lyakhovetskii V.A. The differences in the sensorimotor estimation of the Ponzo and Müller-Lyer illusions

Full text in Russian: Карпинская   В.Ю., Ляховецкий В.А. Различия в сенсомоторной оценке иллюзий Понзо и Мюллера-Лайера
Saint-Petersburg State University, Saint-Petersburg, Russia
Pavlov Institute of Physiology, Russian Academy of Science, Saint-Petersburg, Russia
University of Latvia, Riga, Latvia 

About authors
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Assessment of visual geometric illusions with the use of hand movements was studied. The task specifications varied: movements were made by the right or the left hand, with or without visual control. At first the subjects had to remember the lines by passing their hands across the screen with the image of lines in the context of Müller-Lyer and Ponzo illusions and out the context of these illusions. Then the subjects had to reproduce the length of the segments on a blank screen with their eyes opened or closed. The obtained data showed the differences in estimations of Ponzo and Müller-Lyer illusions. The results revealed different levels of involvements of right and left hemisphere in the task and indicated different mechanisms of Ponzo and Müller-Lyer illusions development. The illusory effect in Ponzo illusion is absent during memorization (the first task) and become marked during reproduction (the second task). These results could be explained with peculiarities of processing the image on different levels of the visual system.

Keywords: Ponzo illusion, Müller-Lyer illusion, factors and causes of perceptual illusions, sensorimotor estimation


The study was supported by Saint-Petersburg State University, project; University of Latvia, project 2013/0021/1DP/


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Received 17 September 2014. Date of publication: 28 December 2014.

About authors

Karpinskaya Valeriya Yu. Ph.D., Associate Professor, Faculty of Psychology, Saint-Petersburg State University, Universitetskaya naberegnaya 7/9, 190000 Saint-Petersburg, Russia.
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Lyakhovetskii Vsevolod A. Ph.D., Junior Research Associate, Pavlov Institute of Physiology, Russian Academy of  Science, Naberegnaya Makarova 6, 199034 Saint-Petersburg, Russia; Visiting Researcher, University of Latvia, bulvar Raina 19, LV-1059 Riga, Latvia.

Suggested citation

Karpinskaya V. J., Lyakhovetskii V. A. The differences in the sensor motor estimation of the  illusions Ponzo and Müller-Lyer. Psikhologicheskie Issledovaniya, 2014, Vol. 7, No. 38, p. 3. (in Russian, abstr. in English).

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