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Final

PSYCH 10 Lecture 3: Lab 3 WorksheetExam


Department
Psychology
Course Code
PSYCH 10
Professor
Courtney Clark
Study Guide
Final

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Nicolette Khalifian
Fall 2018
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
reference line.
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.
Line
Length
(dpi)
Mean % of the
time you said
Longer
150
0
155
0
160
0
165
0
170
0
175
25
180
50
185
50
190
75
195
100
200
75
205
75
210
100
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