PSYCH 10 Lecture 3: Lab 3 WorksheetExam
Course CodePSYCH 10
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Lab 3 – Worksheet
Today we are going to measure the size of your illusion using the method of constant stimuli. In
this method, we are going to keep the length of the reference line constant (i.e., the line on the
left will always be 160 pixels). On each trial you will see different lengths of the line on the
right, and you need to decide whether the line on the right appears longer or shorter than the
1. In the online experiment you viewed 13 different line lengths. Each line length was
viewed 4 times. At the end of the experiment, the computer displayed the mean % of the
time you said “longer” for each of the line length. Copy those means into the chart below.
Mean % of the
time you said
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