Pigeons, with one eye open, were reinforced for pecking at a 45 degrees oblique line (/). When the opposite, untrained, eye alone was open, pigeons responded maximally to the mirror-image (135 degrees [unknown]) of the training stimulus (45 degrees [unknown]). This unexpected interocular reversal of mirror-image stimuli has not been reported for any other species.
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Nancy K. Mello (1965) studied this question.
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