ndocranial asymmetry in New World monkeys: a comparative phylogenetic analysis of morphometric dat

Autor(es)

Gonzalez, Paula N. ^[1] ; Vallejo-Azar, Mariana ^[1] ; Aristide, Leandro ^[2] ; Lopes, Ricardo ^[3] ; dos Reis, Sergio F. ^[4] ; Perez, S. Ivan ^[5]

Afiliação do(s) autor(es)

^[1] CONICET UNAJ HEC, Unidad Ejecutora Estudios Neurociencias & Sistema, Buenos Aires, DF - Argentina

^[2] UPF CSIC, Inst Biol Evolut, Barcelona - Spain

^[3] Univ Fed Rio de Janeiro, Lab Instrumentac Nucl, Ctr Tecnol, Rio de Janeiro - Brazil

^[4] Univ Estadual Campinas, Inst Biol Anim, Campinas - Brazil

^[5] FCNyM UNLP, Div Antropol, CONICET, La Plata - Argentina

• Tipo de documento: Artigo Científico
• Fonte: Brain Structure & Function; v. 227, n. 2, SI AUG 2021.
• Citações Web of Science: 0

Resumo

Brain lateralization is a widespread phenomenon although its expression across primates is still controversial due to the reduced number of species analyzed and the disparity of methods used. To gain insight into the diversification of neuroanatomical asymmetries in non-human primates we analyze the endocasts, as a proxy of external brain morphology, of a large sample of New World monkeys and test the effect of brain size, home range and group sizes in the pattern and magnitude of shape asymmetry. Digital endocasts from 26 species were obtained from MicroCT scans and a set of 3D coordinates was digitized on endocast surfaces. Results indicate that Ateles, Brachyteles, Callicebus and Cacajao tend to have a rightward frontal and a leftward occipital lobe asymmetry, whereas Aotus, Callitrichinae and Cebinae have either the opposite pattern or no directional asymmetry. Such differences in the pattern of asymmetry were associated with group and home range sizes. Conversely, its magnitude was significantly associated with brain size, with larger-brained species showing higher inter-hemispheric differences. These findings support the hypothesis that reduction in inter-hemispheric connectivity in larger brains favors the lateralization and increases the structural asymmetries, whereas the patterns of shape asymmetry might be driven by socio-ecological differences among species. (AU)

• Processo FAPESP: 17/17357-0 - Diversidade e evolução nos anfíbios do gênero Brachycephalus (Amphibia: Brachycephalidae)
• Beneficiário: Sérgio Furtado dos Reis
• Modalidade de apoio: Auxílio à Pesquisa - Regular