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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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00382_Text_rem05t.txt
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1997-02-04
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Another way of stating the
barber-pole effect is that we
have a tendency not to perceive
the points constituting a
visible contour as moving out of
view, or as changing location
and being exchanged for new
points, when there is no good
stimulus information that they
are doing so. Under some
conditions, this tendency can
lead to perceiving moving lines
as stationary. This tendency,
in turn, leads to various other
illusions, such as the
impression that the circles in
the stereokinetic display
described earlier are not
rotating when the display is
turning. If they are not
rotating, they must be changing
their positions by sliding
around. In my opinion, the
difficulty the perceptual system
has in explaining this
perception leads it to search for
a better solution. The depth
solution discussed in Chapter 3,
in which the object is
perceived to undergo
perspective change, is
precisely that. The same
tendency not to perceive
rotation of rotating circular or
curved patterns leads to the
perception of a rotating spiral
as expanding or contracting,
since each region of it then
appears to be moving only
inward or outward, depending
upon the direction of the
spiralΓÇÖs rotation.