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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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00328_Text_re43bt.txt
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1997-02-04
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765b
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26 lines
When put to a direct test,
however, the claim that the
Poggendorff effect is based on
the overestimation of acute
angles is found wanting. In the
illustration to the left, the
Poggendorff pattern is modified
in two ways: In A, the acute
angles are eliminated; in B, the
obtuse angles are eliminated. As
can be seen, the former
continues to yield the illusion
whereas the latter does not.
Therefore, if misperception of
angle accounts for the illusion,
it must be argued that the effect
occurs because obtuse angles
are underestimated, not
because acute angles are
overestimated. However, this
conclusion is not consonant
with Blakemore et al.ΓÇÖs
findings, nor does it follow
from the lateral-inhibition
theory.