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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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00405_Field_405.txt
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1996-12-31
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THE VISUAL FRAME OF REFERENCE
Observers inside a tilted room
who are given the task of
setting the adjustable chair to a
position that is experienced as
upright usually set the chair in
the direction of the roomΓÇÖs tilt.
Why does the Aubert effect not
occur in daily life when the
entire scene is visible? If the
observer lies on his or her side
in a lighted room, the same
misinformation from the inner
ear is received. Thus, the
entire scene ought to appear to
be tilted, but it does not. Some
source of information other
than gravity must, therefore,
be available. The same
conclusion can be reached
when we consider the
perceptions we have when we
are inside a tilted fun room in
an amusement park or an
enclosed room of a listing ship
or a banking plane. The brain
surely registers information
about the direction of gravity.
But these rooms do not look
tilted; they tend to look
perfectly upright. Accordingly,
we may align our bodies to what
seems to be the roomΓÇÖs vertical
axis and risk either falling over
or, at the least, feeling
peculiar.
In these instances, we seem
to accept the coordinates of the
room as defining vertical and
horizontal and to perceive all
other orientations in relation
to them. The room becomes a
visual frame of reference. Just
as a frame of reference is
important in motion
perception, so it is important in
orientation perception. Gravity
is not the only information
that affects how objects appear
to be oriented in the
environment.