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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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00099_Text_res06t.txt
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1996-12-31
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Often failure or partial
failure of constancy is to be
explained in just this way. For
example, an airplane in the sky
looks smaller than it would if
constancy prevailed, and
surely this is a consequence of
poor cues to distance (see the
earlier discussion of the
elevated moon). The same
explanation of
underregistration of distance
information has also been
invoked for objects on the
ground, where more distance
cues are available. For example,
when the airplane is seen on
the ground from roughly the
same distance as when it was
airborne, it undoubtedly will
look larger than it would in the
sky, but it will also
undoubtedly look much smaller
than it would if seen close up.
However, in experiments
conducted in recent decades,
researchers have found that
observers report very distant
objects to be even larger than
they objectively areΓÇöΓÇôan
observation referred to as
overconstancyΓÇöΓÇôand that
constancy often holds at very
great distances, when distance
cues are available. How can we
make sense of these
contradictory findings and
explain why objects at great
distances often look diminutive
in everyday life?
We typically do not take
measurements of perception in
everyday life, so investigators
assume that their facts are to be
trusted more than casual
observations. However, my view
is the opposite. We must start
from observations in daily life
and, if experiments yield
different results, we should re-
examine our experiments.
Overconstancy is a case in
point.