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Illusion - Is Seeing Really Believing?
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Illusion - Is Seeing Really Believing (1998)(Marshall Media)[Mac-PC].iso
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1997-02-04
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960b
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34 lines
Hans Wallach and his
associates at Swarthmore
College showed just such a
learning process at work in
depth perception, although not
with respect to linear
perspective. In one
experiment, they used a simple
wire object, selected for having
a projection that would not
convey any impression of
three-dimensionality at the
outset. Subjects were first
shown a shadow pattern of such
a wire object cast on a screen,
which they perceived as two-
dimensional. Then the
investigators set the wire object
in motion, creating a kinetic
depth effect in which the
transforming shadow pattern
yielded a three-dimensional
impression. Finally, the
subjects viewed the shadow
pattern when it was again
stationary. They now perceived
it to be three-dimensional.
Presumably, therefore,
observers learned that this
two-dimensional pattern
signified a three-dimensional
object and they perceived it
accordingly.