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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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00242_Text_ref09t.txt
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1997-02-04
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51 lines
Does such reversibility
require special explanation or
does it suffice to say (as I
already have) that, because the
stimulus can (more or less)
equally represent these
different objects, it is perfectly
understandable that perception
will shift from time to time?
Most psychologists would say
that reversal requires
explanation because a
"decision" has been made by
the perceptual system as to
what the stimulus represents;
thus some event must have
occurred to change the
perception at a particular
moment. The only explanation
of reversal that has been given
any currency in the
psychological literature for the
last half century is the
satiation theory, or fatigue
theory. According to this
theory, advanced most
forcefully and explicitly by the
Gestalt psychologist Wolfgang
K├╢hler, each perceptual
organization is determined by a
separate neural event in the
brain. If one ongoing neural
event becomes satiated or
fatigued (much the way neural
discharge is known to become
fatigued and resistant to
further discharge in other
realms, such as in color
vision), we can assume that the
brain resists its further
occurrence. When the
resistance reaches the point of
completely blocking that
neural event, the stage is set
for a switch to the other neural
event, the one to which the
stimulus can equally well lead.
When that switch occurs, it is
experienced consciously as a
change in the percept.