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Climate Change Influences Brain Size in Humans
1Natural History Museum, Los Angeles, California, USA.
Brain, Behavior and Evolution
|December 27, 2022
Summary
Human brain size decreased during warm climate periods over the last 50,000 years, suggesting an adaptive response to climate change and environmental stress. Cooler, arid conditions were linked to larger hominin brains.
Area of Science:
- Paleoclimatology
- Human Evolution
- Paleoanthropology
Background:
- Hominin brain size evolution is a key trend, but its drivers remain unclear.
- Climate change is a significant environmental factor influencing evolutionary adaptations.
Purpose of the Study:
- To investigate the impact of paleoclimate changes on hominin brain size.
- To identify potential adaptive responses of brain size to environmental stressors.
Main Methods:
- Analysis of paleoclimate records (temperature, humidity, precipitation).
- Correlation of climate data with brain size in 298 Homo specimens over 50,000 years.
Main Results:
- Hominin brain size was significantly smaller during warmer climate periods compared to cooler periods.
- Arid conditions were associated with larger hominin brain size.
- An adaptive response to climate change appears to have begun ~15,000 years ago.
Conclusions:
- Climate change, particularly temperature fluctuations, has influenced hominin brain size evolution.
- Natural selection in response to environmental stress likely drove these changes.
- The observed trend may have implications for modern human brain size.
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