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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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00300_Field_300.txt
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1996-12-31
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Although Treisman and
SchmidtΓÇÖs initial finding on
illusory conjunctions has been
confirmed and is now widely
accepted, the possibility
remains that the effect is more
a matter of subjects guessing in
the face of uncertainty about
what they had seen than it is a
genuine perception. Treisman
made several attempts to rule
out this possibility.
Nonetheless not all reports of
what one believes one has
perceived in the brief exposure
period of several shapes of
differing colors may reflect a
genuine perceptual experience.
So the interpretation of this
discovery should be placed on
"hold" for the time being.
Arien Mack of the New School
for Social Research and I have
taken a different tack in
exploring the role of attention
in perception. Not satisfied
with any existing method of
eliminating attention to a
display, we sought a more
stringent way of doing so in
order to investigate the
question of what, if anything,
is perceived when attention
can be prevented from being
deployed to some specific
stimulus item. In most studies,
the only way of getting at this
question has been to give a
subject two tasks
simultaneously, usually
emphasizing to the subject that
one task is important and the
other of only secondary
interest. This is a "divided
attention" paradigm. A task
Treisman and Schmidt used, in
which subjects are to identify
two digits, one on each side of
colored letters, can be thought
of as the primary task.
Reporting what colored letters
were seen between the
numbers can be thought of as
the secondary task.