Effects of Instructional Set and Physical Stimuli on the Mueller-Lyer Illusion Page: 15
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15
consistent with illusion effect observed when the two Mueller-
Lyer components are compared with each other. He suggested
that the distance between the tips of the obliques apparently
plays some direct role in the judgments of the perceived
length of the apex line.
In his research, Erlebacher (13) found further support
for the Central Tendency Effect theory and convincing refu-
tation of the Inappropriate Constancy Scaling theory. By
separately altering the length and the angle of the obliques,
he was able to vary the distance between their tips.
Erlebacher found that as the distance between the tips of
the obliques varied, so did the magnitude of the illusion.
When, however, he changed the angle of the obliques, but
maintained a constant distance between their tips by in-
creasing the length proportionately with the increase in
angle, he found that the magnitude of the illusion remained
unchanged. Therefore, angle size was found not to be a
determinant of the magnitude of the illusion,
As stated earlier, according to the Inappropriate Con-
stancy Scaling theory, the angles of the obliques were said
to suggest depth in the Mueller-Lyer figure. In view of this
theory, it could therefore be assumed that a change in the
angle of the obliques would seemingly alter the amount of
depth perceived. As the angle approaches ninety degrees,
apparent depth would predictably decrease, and concomitantly,
the magnitude of the illusion would decrease. Erlebacher's
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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. (https://digital.library.unt.edu/ark:/67531/metadc663521/m1/22/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .