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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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00421_Text_res23bt.txt
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1997-02-04
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Unfortunately, the evidence
gained from repetitions of
StrattonΓÇÖs experiment is not
conclusive either. Some
investigators were not
concerned with the question of
visual appearances but only
with sensory-motor
performance; others changed
the apparatus in certain
critical respects, making
comparison difficult. One study
by Theodor Erismann and Ivo
Kohler made use of a mirror
placed on the underside of the
visor of a cap into which the
observer looked in order to see
the scene. The mirror reversed
up and down, but not left and
right. The investigators claimed
that egocentric adaptation
occurred, and, to their credit,
they were the first to introduce
tests in which objects were
presented for identification
whose orientation was
ambiguousΓÇöΓÇôfor example,
letters such as "M." But these
results were not sufficiently
clear-cut to support their
conclusion, at least in my
opinion.
Moreover, some subjectsΓÇÖ
introspections in these studies
are hard to comprehend. For
example, Kohler claimed that
his subjectsΓÇÖ visual perception
underwent a peculiar
piecemeal transformation.
After 18 days of wearing right-
angle prisms that reversed the
retinal images right for left
without inverting them, one
subject reported: "Inscriptions
on buildings, or
advertisements, were still seen
in mirror writing, but the
objects containing them were
seen in the correct location.
Vehicles driving on the ΓÇÿrightΓÇÖ
... carried license numbers in
mirror writing." Kohler notes
that "the subject is capable of
localizing both sides of, say, a
ΓÇÿ3ΓÇÖ correctly (open to the left,
the curves to the right) and
still see it mirrorwise." It is
difficult to imagine how such
inconsistent perceptions could
occur.