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Artificial mosaic brain evolution of relative telencephalon size improves inhibitory control abilities in the guppy (Poecilia reticulata)
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0001-5592-8963
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0002-2233-9262
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0002-1439-4691
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0001-5791-336x
Number of Authors: 42022 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 76, no 1, p. 128-138Article in journal (Refereed) Published
Abstract [en]

Mosaic brain evolution, the change in the size of separate brain regions in response to selection on cognitive performance, is an important idea in the field of cognitive evolution. However, untill now, most of the data on how separate brain regions respond to selection and their cognitive consequences stem from comparative studies. To experimentally investigate the influence of mosaic brain evolution on cognitive ability, we used male guppies artificially selected for large and small telencephalons relative to the rest of the brain. Here, we tested an important aspect of executive cognitive ability using a detour task. We found that males with larger telencephalons outperformed males with smaller telencephalons. Fish with larger telencephalons showed faster improvement in performance during detour training and were more successful in reaching the food reward without touching the transparent barrier (i.e., through correct detouring) during the test phase. Together, our findings provide the first experimental evidence showing that evolutionary enlargement of relative telencephalon size confers cognitive benefits, supporting an important role for mosaic brain evolution during cognitive evolution.

Place, publisher, year, edition, pages
2022. Vol. 76, no 1, p. 128-138
Keywords [en]
Detour task, fish, inhibitory control, male guppies, relative telencephalon size
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-199787DOI: 10.1111/evo.14405ISI: 000724096100001PubMedID: 34806770OAI: oai:DiVA.org:su-199787DiVA, id: diva2:1621579
Available from: 2021-12-20 Created: 2021-12-20 Last updated: 2022-01-25Bibliographically approved

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Triki, ZegniFong, StephanieAmcoff, MirjamKolm, Niclas

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