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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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00416_Field_416.txt
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1996-12-31
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UPRIGHT VISION FROM AN
UPRIGHT IMAGE?
This inverting prism apparatus
was used in a recent
experiment on perception of
orientation.
If we can obtain the same
information about the
orientation of things relative to
one another and to our own
seen bodies, will we see the
world upright even if we turn
the image 180 degrees? This was
precisely the question that, as
was mentioned in Chapter 7,
George Stratton asked around
the turn of the century, having
absorbed the relativistic
analysis given by Berkeley two
centuries earlier. He set out (in
Berkeley, California, a city
named in honor of the
philosopher!) to prove that
upright vision would be upright
even when one views the world
through an optical device that
inverts the normal retinal
image. He also wanted to
disprove certain theories of his
day that held that upright
vision actually required an
inverted image. According to
one such theory, "uprightness"
was a result of the direction the
eyes move in scanning objects.
For example, to gaze directly at
an object whose image is in the
lowermost part of the retina,
one must move the eyes upward.
In other words, if that image is
below the fovea, the eyes must
swivel upward before it can fall
on the fovea.