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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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00360_Field_360.txt
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1996-12-31
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StrattonΓÇÖs inverting lenses
yield illusory motion of a
scene. When Stratton turned
his head from the position
shown on the left to the
position shown on the right,
the retinal images of stationary
objects shifted in a direction
opposite to their normal
direction.
Around the turn of the century,
George Stratton, a psychologist
at the University of California
at Berkeley, performed an
experiment that is still being
discussed and disputed. For
eight days in succession,
Stratton wore lenses mounted
in a tube in front of one of his
eyes that inverted and reversed
the images that reached his
retina. He was interested in
discovering whether or not the
scene that appeared upside
down would eventually appear
right side up if he continued to
wear the lenses, an issue we
will take up in Chapter 8. What
is of interest here is StrattonΓÇÖs
observation that objects viewed
through the lenses appeared to
shift in direction in an
abnormal way when he moved.
At first, a stationary scene
appeared to move in the
direction of his own movement
and at a faster rate. We can
conclude from this fact that,
when there is an abnormal
change in direction during an
observerΓÇÖs movement, things
will appear to move. Position
constancy is lost. More recent
experiments indicate that the
same is true if the rate at
which things change their
direction is altered during the
observerΓÇÖs movement, even if
the direction of movement
itself is not altered.