Effects of Instructional Set and Physical Stimuli on the Mueller-Lyer Illusion Page: 2
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Hall, David L., Effects of Instructional Set and Physical
Stimuli on the Mueller-Lyer Illusion, Master of Science
(Clinical Psychology), December, 1970, 67 pp., 9 tables,
5 illustrations, bibliography 45 titles.
This study is designed to determine to what extent cer-
tain stimulus variables and various instructions might alter
subjects' perception of the Mueller-Lyer illusion figure.
Ninety male and female college students were randomly assigned
to one of six groups. The subjects viewed one of three con-
figurations of the composite form of the Mueller-Lyer illusion
and received one of two variations of instructions.
Depending upon the group to which they were assigned,
the subjects saw sets of twenty cards depicting the Mueller-
Lyer illusion with either a black apex line, a red apex line,
or with the apex line missing. Instructions given to three
of the six groups were designed to decrease the subjects'
attention to the oblique lines of the figure. These three
groups were designated the special instructions groups.
The subjects' susceptibility to the illusion was recorded
and a mean magnitude of illusion was obtained for each group.
A two-by-three analysis of variance and. t-tests between
selected cells of the two-by-three statistical design were
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Hall, David Lawrence Boyer. Effects of Instructional Set and Physical Stimuli on the Mueller-Lyer Illusion, dissertation, December 1970; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc663521/m1/2/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .