Pigeons identify individual humans but show no sign of recognizing them in photographs |
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Authors: | Lars Dittrich,Ruth Adam,Emre Ü nver |
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Affiliation: | a International Graduate School of Neuroscience, Ruhr-University Bochum, Bochum, Germany b Biopsychology, Ruhr-University Bochum, Bochum, Germany |
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Abstract: | Photographs, especially of humans, are widely used as stimuli in behavioural research with pigeons. Despite their abundant use, it is not clear to what extent pigeons perceive photographs as representing three-dimensional objects. To address this question, we trained 16 pigeons to identify individual, real-life humans. This discrimination depended primarily on visual cues from the heads of the persons. Subsequently, the pigeons were shown photographs of these individuals to test for transfer to a two-dimensional representation. Successful identification of a three-dimensional person did not facilitate learning of the corresponding photographs. These results demonstrate limitations of cross-recognition of complex objects and their photographs in pigeons. |
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Keywords: | Columba livia Human category Object recognition Pictorial representation Representational insight |
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