Abstract
Two baboons were trained on oddity problems with sets of stimuli involving parallel lines. When stable discrimination performance had been established, occasional test trials were run with Zöllner illusion figures. Both animals appeared to have been deceived by the illusion.
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Benhar, E., & Samuel, D.Discrimination of shape and colour in the baboon. Manuscript in preparation, 1982.
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Benhar, E., Samuel, D. Visual illusions in the baboon (Papio anubis). Animal Learning & Behavior 10, 115–118 (1982). https://doi.org/10.3758/BF03212056
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DOI: https://doi.org/10.3758/BF03212056