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- Title
Bantams ( Gallus gallus domesticus) also perceive a reversed Zöllner illusion.
- Authors
Watanabe, Sota; Nakamura, Noriyuki; Fujita, Kazuo
- Abstract
Although pigeons have been shown to be susceptible to several size and length illusions, other avian species have not been tested intensively for illusory perception. Here we report how bantams perceive the Zöllner figure, in which parallel lines look nonparallel due to short crosshatches superimposed on the lines. Watanabe et al. (Cognition 119:137-141, ) showed that pigeons, like humans, perceived parallel lines as nonparallel but that the orientation of subjective convergence was opposite to that of humans. We trained three bantams to peck at the narrower (or wider) of the two gaps at the end of a pair of nonparallel lines. After adapting them to target lines with randomly oriented crosshatches (which result in no apparent illusion to humans), we tested the bantams' responses on randomly inserted probe trials, in which crosshatches that should induce the standard Zöllner-like illusion for humans replaced the randomly oriented ones. The results suggested bantams, like pigeons, perceive a reversed Zöllner illusion.
- Subjects
BANTAM chickens; CHICKENS; PIGEONS; CONVERGENT evolution; ANIMAL psychology; ANIMAL behavior
- Publication
Animal Cognition, 2013, Vol 16, Issue 1, p109
- ISSN
1435-9448
- Publication type
Article
- DOI
10.1007/s10071-012-0556-0