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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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00377_Field_377.txt
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1996-12-31
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810b
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28 lines
Thus, as has been suggested
by Duncker and by the
psychologist Gunnar Johansson
at the University of Uppsala,
under some conditions a path of
motion will yield two
components of perceived
motion, as if the actual path
were split into two vectors, as
shown in the illustration at
left. Some insight into the basis
of this kind of effect can be
gained by considering an
example from daily life.
Suppose you watch a friend
leaving on a train. Your friend
waves at you. You perceive the
waving hand moving up and
down, although, in fact, as the
train moves forward, the hand
is moving along a path
resembling a sine curve. In this
example, perceiving the hand
as moving vertically is not an
illusion because, relative to
the train, it is moving
vertically.