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Geometric morphometrics and paleoneurology: brain shape evolution in the genus Homo
1Dipartimento di Biologia Animale e dell'Uomo, Università La Sapienza, P.le A. Moro 5, 00185 Roma, Italy. emiliano.bruner@uniroma1.it
Journal of Human Evolution
|November 9, 2004
Summary
Paleoneurology reveals distinct endocranial shape changes in Homo evolution. Non-modern Homo species show parietal shortening, while modern humans exhibit parietal globularity linked to enhanced visuospatial functions.
Area of Science:
- Paleoneurology
- Paleoanthropology
- Evolutionary Biology
Background:
- Paleoneurology analyzes fossil endocasts to understand brain evolution.
- Endocranial shape provides insights into brain structure and function.
- Previous studies have examined cranial capacity and discrete features in Homo fossils.
Purpose of the Study:
- To analyze endocranial shape variation in the genus Homo using traditional metrics and 2D geometric morphometrics.
- To investigate the relationship between cranial capacity and endocranial structural changes.
- To infer neurofunctional differences between Homo morphotypes.
Main Methods:
- Analysis of fossil endocasts from the genus Homo.
- Application of traditional morphometric measurements.
- Utilisation of 2D geometric morphometrics on lateral endocranial projections.
Main Results:
- A size-related pattern in maximum and frontal widths was observed across Homo taxa.
- Non-modern Homo morphotypes exhibit endocranial vertical stretching and parietal shortening with increased cranial capacity.
- Modern humans display parietal volume hypertrophy, resulting in a globular braincase and potential structural adaptations.
Conclusions:
- Endocranial shape evolution in Homo is linked to changes in parietal regions.
- Parietal area adaptations in modern humans may relate to enhanced visuospatial coordination and higher cognitive functions.
- Physical constraints, such as the falx cerebri and cranial base, likely influenced brain morphogenetic trajectories.
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