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Dissecting the Non-human Primate Brain in Stereotaxic Space
Published on: July 16, 2009
Differential prefrontal white matter development in chimpanzees and humans
Tomoko Sakai1, Akichika Mikami, Masaki Tomonaga
1Department of Zoology, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
Current Biology : CB
|August 13, 2011
Summary
Chimpanzee prefrontal white matter (WM) develops slower than human WM during infancy, suggesting prolonged brain development in our common ancestor. This extended development may enhance learning from postnatal experiences.
Area of Science:
- Neuroscience
- Evolutionary Biology
- Developmental Psychology
Background:
- White matter (WM) development is crucial for cognitive functions and brain evolution.
- Prefrontal WM development patterns differ between humans and macaques.
- Understanding chimpanzee prefrontal WM development is key to human brain evolution.
Purpose of the Study:
- To compare the developmental trajectory of prefrontal white matter (WM) volume in chimpanzees with that of humans and macaques.
- To infer the ancestral state of prefrontal WM development in the common ancestor of humans and chimpanzees.
Main Methods:
- Longitudinal study using magnetic resonance imaging (MRI) scans of chimpanzees.
- Analysis of prefrontal WM volume changes from infancy through prepuberty.
Main Results:
- Chimpanzee prefrontal WM volume remains immature during prepuberty, unlike macaques but similar to humans.
- The rate of prefrontal WM volume increase during infancy is slower in chimpanzees compared to humans.
Conclusions:
- A protracted prefrontal WM development existed in the human-chimpanzee common ancestor, allowing greater influence of postnatal experiences.
- Rapid human infant prefrontal WM development may facilitate complex social interactions and skill acquisition.
