Objective The Müller-Lycr illusion is a visual illusion in which a horizontal shaft with an inward-pointing chevron （fins-out） affixed to each end is perceived longer than a shaft with outward-pointing chevrons （fins-in）. The goal of this study was to compare the effects of experience and knowledge about the Müller-Lyer illusion on participants＇ perceptual precision. Method Participants were undergraduate students （n = 108） who were not familiar with the Müller-Lyer illusion prior to the experiment. The task of participants was to adjust one movable line to make it equal to the other in Müller-Lyer figure. They received ascending and descending Müller-Lyer trials in three blocks with 20 trials each. The Experimental Group received information about the Müller-Lyer illusion prior to the third block. Results For the Experimental Group, the amount of departure in Block 3 was reduced significantly compared with previous blocks. Conclusion Knowledge about the mechanisms underlying visual illusions may play an important role in helping individuals overcome them.
Abbas A.KhorasaniJavad S. FadardiMarziyeh S.FadardiW.Miles CoxJafar T.Sharif
