Muller-Lyer Illusion Lab

Due: Oct. 3, 2007

In Red: Global Data In Blue: My Data

Muller-Lyer Lab Data Analysis:

The graph shows plot points on an X and Y axis, with X being the length of the line without wings (in pixels) and the Y being the proportion line without wings being seen as “bigger.” The global data shows a smoother psychometric curve, the changes between each length of line (X-axis) and the percent of longer length (Y-axis). My graph implies that I noticed differences in length of the ones with wings versus ones without perhaps a bit better than I should have, that this illusion was not easy for me to be caught in, but still exists. The global data shows the illusion much better, that the majority of people were able to see that the illusion exists. My PSE, point of subjective equality, which is where the fifty percent line meets my data line approximately landed on the 105 mark. This means that the point in which it was difficult for me to differentiate between which line is longer, is at about five percent more length on the line without wings. The global data’s PSE lands approximately on the 113 mark. This means that the point before the line without wings looks longer has about thirteen percent more length.