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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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ILLUSION
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00294_Text_ref26t.txt
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1996-12-31
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Analogous experiments have
been done in vision. In an
experiment that Dan Gutman
and I did, overlapping visual
figures of novel shapes in
differing colors were presented
to subjects at a fairly rapid rate.
The subject was to rate all red
(or for other subjects, green)
figures on a scale of aesthetic
preferenceΓÇöΓÇôa slight deception
intended to focus attention on
one figure only in each
overlapping pair. When all pairs
in the series had been shown,
the subject was given a
recognition test to determine
whether the unattended figures
as well as the attended ones
could be recognized. The results
indicated significant
recognition of the attended
figures but performance no
better than chance for the
unattended ones. Follow-up
experiments showed that even
directly after a given slide had
been seen there was no
evidence for any memory of the
unattended figure, even if it
was the outline of a very
familiar shape.
Why does the perception of
shape require attention? This is
a matter about which
investigators can disagree, but I
believe it can be explained in
terms of the description process
that I suggested is the basis of
form perception. Such
description occurs for the
attended figure in each pair in
the foregoing experiment but
not for the unattended figure.
Here we have a more drastic
consequence of the absence of
attention than was suggested in
the cases of initial failure to
discriminate among members of
a class of objects. In these
cases, attention is given to
each member when it is seen,
but it is focused on its global
properties and not on its
details.