Two-element identical-different conditional categorization in pigeons: finding differences

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J Exp Psychol Anim Learn Cogn. September 13, 2021. doi: 10.1037 / xan0000297. Online ahead of print.


Research on the same or different categorizations has shown that mastery of such tasks can be strongly affected by the number of items in training charts, for both humans and non-human animals. The evidence for the same and different two-part categorization in pigeons is decidedly mixed: although some investigations have succeeded, others have failed. To date, no research has documented successful identical-different conditional categorization using just two items, and no research has explored how pigeon responses in this paradigm might be influenced by the perceptual characteristics of training stimuli. . Through a series of methodological changes, we provide the first successful documentation indicating that pigeons can perform identical two-item conditional categorization with a high degree of precision; furthermore, they can do this without the aid of repeating items. We also show for the first time that the perceptual disparity between the elements of different stimuli pairs plays a key role in the same-different categorization performance of pigeons. (PsycInfo (c) 2021 APA database registration, all rights reserved).

PMID: 34516196 | DOI: 10.1037 / xan0000297

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