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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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00056_Text_res03t.txt
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1997-02-04
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The major reason for
rejecting the stimulus-relation
explanation of size constancy,
however, is that constancy can
be achieved in instances where
stimulus relations are not
applicable. For example, in a
dark room with only a single
luminous object visible,
constancy will hold as long as
distance information is
available, such as is provided at
near distances by
accommodationΓÇöΓÇôthe tendency
of the lens to accommodate for
the distance of an object until
sharp vision is achievedΓÇöΓÇôand
by convergenceΓÇöΓÇôthe tendency
of the two eyes to converge on
an object in order to maintain
single vision of it. Yet if the
subject is required to view the
object with one eye through a
tiny pinholeΓÇöΓÇôor artificial
pupil, as it is calledΓÇöΓÇôthus
eliminating such cues to
distance, constancy fails.
Under these conditions, the
objectΓÇÖs size appears to be
indeterminateΓÇöΓÇôthat is, to have
no definite objective size at all
ΓÇöΓÇôand two such objects will be
matched on the basis of visual
angle alone.