Abstract
Monocularly viewing pigeons were trained to peck a key when it displayed a 135-deg line, but not when it displayed a 45-deg line. During training, the key could be operated by pecks on the left side only. Tests for interocular transfer were given with either the left or right sides of the key operating. Changing the location of displaced pecking on the key between training and interocular transfer testing (beak shift) had a marked effect on the extent to which interocular mirror-image reversal occurred. However, some birds showed interocular reversal without a change in the direction of displaced pecking (i.e., without beak shift), indicating that beak shift is not crucial to interocular reversal.
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References
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Beale, I.L., Williams, R.J. Experimental control of beak shift during tests for interocular transfer of a lateral mirror-image discrimination. Psychon Sci 24, 7–8 (1971). https://doi.org/10.3758/BF03331750
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DOI: https://doi.org/10.3758/BF03331750