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  • Title: Investigations of a mirror-image transfer effect in pigeons.
    Author: Thomas DR, Klipec W, Lyons J.
    Journal: J Exp Anal Behav; 1966 Sep; 9(5):567-71. PubMed ID: 5964513.
    Abstract:
    In two separate experiments, pigeons trained binocularly to peck a key on which an oblique line (e.g., 60 degrees counter-clockwise rotation from horizontal) was projected yielded bi-modal angularity generalization gradients in extinction, with peaks of responding at both the training stimulus and its mirror image (in this case 120 degrees ). This mirror-image transfer effect may be analogous to an "octave effect" in auditory generalization, but Mello's finding of a mirror-image reversal transfer effect following monocular training in pigeons suggests an alternative interpretation.
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