Expansion of the neocerebellum in Hominoidea
Abstract
Technological and conceptual breakthroughs have led to more serious consideration of the cerebellum as an essential element in cognition. Recent studies show the lateral cerebellum, seat of the neocerebellum, to be most active in cognitive tasks. An examination of the relative volumes of the cerebellar hemispheres in anthropoids would reveal whether some groups show greater neocerebellar development through hemispheric expansion beyond expected allometry, implying a greater contribution of the lateral hemispheres to cognition. This study expands the existing data on primate brain and brain part volumes by incorporating data from both magnetic resonance scans and histological sections for a total sample size of 97 specimens, including 42 apes, 14 humans and 41 monkeys. The resulting volumes of whole brain, cerebellum, vermis, and hemisphere enable a reliable linear regression contrast between hominoids and monkeys, and demonstrate a striking increase in the lateral cerebellum in hominoids. The uniformity of the grade shift suggests that this increase took place in the common ancestor to the hominoids. The importance of the neocerebellum in visual-spatial skills, planning of complex movements, procedural learning, attention switching, and sensory discrimination in manipulation would facilitate the adaptation of these early hominoids to frugivory and suspensory feeding.
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Several comparative studies suggest that cerebellar expansion, specifically involving the lateral cerebellum, was especially marked in apes.
“Several comparative studies suggest that cerebellar expansion, specifically involving the lateral cerebellum, was especially marked in apes [69–71].”
From Embodied cognitive evolution and the cerebellum (2012) · cites this paper as [70]
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- Authors
- MacLeod, C.
- Affiliations
- Langara College (CA)
- Corresponding author
- MacLeod, C
- Venue
- Journal of Human Evolution
- Publisher
- Elsevier BV
- Published
- 2003-04
- Volume
- 44
- Issue
- 4
- Pages
- 401-429
- ISSN
- 0047-2484 (ISSN-L)
- OpenAlex
- W2037393481
- Cited by
- 174
- References
- 71
- Citations by year
- 2026: 9 · 2025: 6 · 2024: 1 · 2023: 13 · 2022: 3 · 2021: 13 · 2020: 6 · 2019: 12 · 2018: 5 · 2017: 9 · 2016: 7 · 2015: 3 · 2014: 13 · 2013: 4 · 2012: 10
- FWCI
- 6.99
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Human Evolution (publishedVersion)
- PubMed (publishedVersion)
- JuSER (Forschungszentrum Jülich) (submittedVersion)
- Funders
- Leakey Foundation
- Simon Fraser University
- Topics
- Social Sciences › Psychology › Social Psychology › Primate Behavior and Ecology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
- Keywords
- neocerebellum, lateral cerebellum, cerebellar hemispheres, hominoids, apes, monkeys, brain volume, allometry, hominoid evolution, cognitive evolution, frugivory, primate brain
- MeSH terms
- Anatomy, Comparative, Animals, Anthropology, Physical, Cebidae, Cercopithecidae, Cerebellum, Biological Evolution, Female, Humans, Hylobates, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Regression Analysis, Hominidae, Observer Variation
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