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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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00376_Text_re12t.txt
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1997-02-04
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999b
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36 lines
(Left) A spot moving along an
oblique path in a homogeneous
field is perceived veridically.
(Right) When a horizontally
moving frame surrounding the
spot moves along with it, the
spot appears to be moving
vertically.
Before trying to understand
these perceptions, consider the
following example illustrated
at left. If we view a spot of light
traveling along an oblique path
in an otherwise dark room, we
will perceive its motion
correctly. If we view the spot
traveling the same path, but
this time surrounded by a
rectangular frame that is
moving horizontally along with
the spot such that both will
reach their rightmost and
leftmost positions at the same
moment, the spot will no
longer appear to move
obliquely. Our dominant
impression will be that it is
moving up and down. However,
we will also have the
impression, although a less
strong one, that the spot
belongs to the rectangle and is
moving horizontally along with
it.