Abstract
Pigeons monocularly trained on the mirror image discrimination showed the mirror image reversal effect, but those trained on the single stimulus training showed the bimodal generalization gradients with peaks at SD and its mirror image. Tests with radius stimuli indicated that pigeons do not discriminate “left” from “right” during the single stimulus training, whereas they discriminate “left” from “right” on the basis of their using eye in the case of the mirror image discrimination.
