Illusory Line

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Illusory and Adjustable Lines: Susceptibility to Illusions
The Müller-Lyer illusion is a classic optical illusion first popularized by Franz Carl Müller Lyer in the late 1800's (Kazdin, 2000). In this study, it was expected that the participants would manipulate an adjustable line to make the length the same as a line that was presented to them. The illusory and adjustable lines had line makers (arrows) at both ends of the lines. The degree of the angle of the line marker (arrow) influence the participants perception of the length of the illusory line. In this study there were two outcomes for the participants, they could either make the adjustable line shorter or longer than the illusory line creating a positive or negative difference. A positive difference indicates that the illusory line (a line with arrows) was longer than the adjustable line. A negative difference indicates that the illusory line (a line with arrows) was shorter than the adjustable line. This study also examines if there was an association between angles of the arrows and difference in length between illusory and adjustable lines. Many studies suggest that …show more content…
The correlation coefficient was positive associated among length between the illusory line and adjustable line and angle of line makers. The results were reported as r= .69, p>.001. The angle increased by .17 points for every 1-unit increase in length between the illusory like and adjustable line (p>.001). Therefore, the angle increase is correlated with increase in length between the illusory line and adjustable line. Influences of angle degree is significant (B= .001, p> .001). When taking the angle degree in account there is also a significant gender difference in length between illusory line and adjustable line (B= .17,

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