Method of Adjustment – Muller-Lyer Illusion


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Method of Adjustment – Muller-Lyer Illusion
This experiment uses the Method of Adjustment to study the effect of the Muller-Lyer Illusion on your ability to match the length of two lines.  You will do 20 trials of the Muller-Lyer Illusion experiment.  The method you are using is the Method of Adjustment, one of 3 classic psychophysical experimental methods.  You are trying to find your difference threshold, the largest amount of difference between two stimuli that does not make them seem different.  On each trial you will get a result expressed as a percent of difference from the standard stimulus.  You must write down each percentage as it is presented, before going to the next trial.  When you have completed all 20 trials and have recorded all 20 percentage difference results, add up all 20 differences, then divide by 20.  This is the average percentage difference for you.  It is your difference threshold expressed as an average percentage of difference between the two line segments.  In other words, the illusion caused you to see the line segments as equal in length when they were actually, on average,  xx% different from each other.


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