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Human brain evolution writ large and small
Abstract
Human evolution was marked by an extraordinary increase in total brain size relative to body size. While it is certain that increased encephalization is an important factor contributing to the origin of our species-specific cognitive abilities, it is difficult to disentangle which aspects of human neural structure and function are correlated by-products of brain size expansion from those that are specifically related to particular psychological specializations, such as language and enhanced "mentalizing" abilities. In this chapter, we review evidence from allometric scaling studies demonstrating that much of human neocortical organization can be understood as a product of brain enlargement. Defining extra-allometric specializations in humans is often hampered by a severe lack of comparative data from the same neuroanatomical variables across a broad range of primates. When possible, we highlight evidence for features of human neocortical architecture and function that cannot be easily explained as correlates of brain size and, hence, might be more directly associated with the evolution of uniquely human cognitive capacities.
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“Moreover, the underlying biological mechanisms that lead to altered formation of the cortex in individuals with DS may not be reflected in the mouse models that do exist, owing to differences in neurodevelopment across species23–27.”
From Consequences of trisomy 21 for brain development in Down syndrome (2024) · cites this paper as [24]
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Metadata
- Authors
- Sherwood, C. C., Bauernfeind, A. L., Bianchi, S., Raghanti, M. A., & Hof, P. R.
- Affiliations
- George Washington University (US)
- Kent State University (US)
- New York Consortium in Evolutionary Primatology (US)
- Corresponding author
- Sherwood, Chet C.
- Venue
- Progress in Brain Research
- Publisher
- Elsevier
- Published
- 2012
- Volume
- 195
- Pages
- 237-254
- ISSN
- 0079-6123 (ISSN-L)
- OpenAlex
- W149985330
- Cited by
- 113
- References
- 159
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 12 · 2023: 14 · 2022: 9 · 2021: 4 · 2020: 9 · 2019: 7 · 2018: 8 · 2017: 9 · 2016: 12 · 2015: 4 · 2014: 12 · 2013: 7 · 2012: 1
- FWCI
- 27.32
- Type
- book chapter
- Language
- en
- Open access
- closed
- Locations
- Progress in brain research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Neurological Disorders and Stroke (NS42867, R01NS042867)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Primate Behavior and Ecology
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Evolutionary Psychology and Human Behavior
- Social Sciences › Anthropology › Pleistocene-Era Hominins and Archaeology
- Keywords
- human brain evolution, encephalization, brain size, allometric scaling, neocortex, cognitive ability, language evolution, mentalization
- MeSH terms
- Animals, Brain, Brain Mapping, Biological Evolution, Humans, Neurons, Organ Size, Primates, Body Size
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