Abstract
The tendency of fish to perceive the Ebbinghaus illusion was investigated. Redtail splitfins (Xenotoca eiseni, family Goodeidae) were trained to discriminate between two disks of different sizes. Then, fish were presented with two disks of the same size surrounded by disks of large or small size (inducers) arranged to produce the impression (to a human observer) of two disks of different sizes (in the Ebbinghaus illusion, a central disk surrounded by small inducers appears bigger than an identical one surrounded by large inducers). Fish chose the stimulus that, on the basis of a perception of the Ebbinghaus illusion, appeared deceptively larger or smaller, consistent with the condition of training. These results demonstrate that redtail splitfins tend to perceive this particular illusion. The results are discussed with reference to other related illusions that have been recently observed to be experienced by fish (such as the Navon effect), and with regard to their possible evolutionary implications.
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Acknowledgments
This study was supported by research grant from the Cassa di Risparmio of Trento e Rovereto. We wish to thank Matteo Kettmaier for his help with the experiments and Francesco Cerri for the maintenance of the aquaria.
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The authors declare that they have no conflict of interest.
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The experiments reported here comply with the current Italian and European Community laws for the ethical treatment of animals.
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Sovrano, V.A., Albertazzi, L. & Rosa Salva, O. The Ebbinghaus illusion in a fish (Xenotoca eiseni). Anim Cogn 18, 533–542 (2015). https://doi.org/10.1007/s10071-014-0821-5
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DOI: https://doi.org/10.1007/s10071-014-0821-5