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Hominin cognitive evolution: identifying patterns and processes in the fossil and archaeological record
Susanne Shultz1, Emma Nelson, Robin I M Dunbar
1Institute of Cognitive and Evolutionary Anthropology, University of Oxford, 64 Banbury Road, Oxford OX2 6PN, UK. susanne.shultz@manchester.ac.uk
Summary
Hominin brain evolution involved gradual changes and significant leaps, particularly around 100,000 years ago, coinciding with language development. Environmental factors like climate unpredictability do not appear to drive these major shifts in human brain size.
Area of Science:
- Paleoanthropology
- Human Evolution
- Cognitive Science
Background:
- Understanding historical human cognition relies heavily on brain size and architecture due to limited behavioral data in the archaeological record.
- Previous research often links hominin brain evolution to environmental factors, though direct evidence remains debated.
Purpose of the Study:
- To investigate the patterns and driving forces behind hominin brain size evolution.
- To test the association between brain size changes and environmental factors like climate variability and aridity.
Main Methods:
- Analysis of both absolute and residual brain size estimates across hominin lineages.
- Correlation analysis between periods of rapid brain size change and palaeoclimatic data (sea level, dust records).
- Examination of temporal associations with demographic changes and linguistic development.
Main Results:
- Hominin brain evolution is characterized by a combination of gradual changes (e.g., Homo erectus, Homo sapiens) and punctuated events (approx. 100 kya, 1 Mya, 1.8 Mya).
- Migration into Eurasia is linked to step changes in brain size around 400 kya and 100 kya.
- Rapid brain size changes are not correlated with environmental unpredictability or long-term palaeoclimate trends, challenging variability selection and aridity hypotheses.
- A significant brain size increase around 100 kya coincides with demographic shifts and the emergence of modern language.
Conclusions:
- Environmental factors like sea level changes or dust records offer limited explanation for hominin encephalization.
- The drivers of major brain size increases, particularly around 100 kya, remain incompletely understood.
- Future research requires integrated analysis of fossil, palaeoclimatic, and archaeological data to elucidate the pressures behind encephalization.
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