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Neanderthal brain and cognition reconsidered.
P Thomas Schoenemann1,2,3, Ralph L Holloway4, Jia-Hong Gao5
1Cognitive Science Program, Indiana University, Bloomington, IN 47405.
Neanderthal brain shape differences are not significant enough to explain their extinction. Modern human populations show greater brain variation than previously thought, suggesting Neanderthals were not cognitively inferior.
Area of Science:
- Paleoanthropology
- Neuroscience
- Evolutionary Biology
Background:
- Neanderthal endocranial morphology differs from modern humans, historically suggesting cognitive disparities.
- Previous studies inferred significant cognitive differences based on these morphological distinctions.
Purpose of the Study:
- To contextualize Neanderthal brain differences within modern human populational variation.
- To reassess the cognitive implications of endocranial differences between Neanderthals and anatomically modern Homo sapiens (amHs).
Main Methods:
- Utilized deformation mapping to estimate MRI brain region volumes in US and Chinese modern human populations.
- Compared the magnitude of brain region volume differences in modern humans to those reported for Neanderthals vs. amHs.
Main Results:
- Modern human populations (US vs. Chinese) exhibit brain region volume differences comparable to or exceeding those between Neanderthals and amHs.
- 9 out of 13 brain regions showed larger absolute differences in modern populations than between Neanderthals and amHs.
- Endocranial differences predict cognitive effect sizes of 0.14 SDs or less, well within modern human variation.
Conclusions:
- Cognitive differences between Neanderthals and amHs likely fall within the range of modern human variation.
- The morphological brain differences do not support cognitive limitations as a primary driver for Neanderthal replacement.
- Neanderthal extinction was likely not due to significant cognitive inferiority compared to contemporary Homo sapiens.
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