Different ways of evolving tool-using brains in teleosts and amniotes - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Communications Biology Year : 2024

Different ways of evolving tool-using brains in teleosts and amniotes

Abstract

Abstract In mammals and birds, tool-using species are characterized by their relatively large telencephalon containing a higher proportion of total brain neurons compared to other species. Some teleost species in the wrasse family have evolved tool-using abilities. In this study, we compared the brains of tool-using wrasses with various teleost species. We show that in the tool-using wrasses, the telencephalon and the ventral part of the forebrain and midbrain are significantly enlarged compared to other teleost species but do not contain a larger proportion of cells. Instead, this size difference is due to large fiber tracts connecting the dorsal part of the telencephalon (pallium) to the inferior lobe, a ventral mesencephalic structure absent in amniotes. The high degree of connectivity between these structures in tool-using wrasses suggests that the inferior lobe could contribute to higher-order cognitive functions. We conclude that the evolution of non-telencephalic structures might have been key in the emergence of these cognitive functions in teleosts.
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Dates and versions

hal-04398618 , version 1 (16-01-2024)

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Pierre Estienne, Matthieu Simion, Hanako Hagio, Naoyuki Yamamoto, Armin Jenett, et al.. Different ways of evolving tool-using brains in teleosts and amniotes. Communications Biology, 2024, 7 (1), pp.88. ⟨10.1038/s42003-023-05663-8⟩. ⟨hal-04398618⟩
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