Asymmetry of human brain enhances cognition compared to other primates

Apr 25, 2013
Asymmetry of human brain enhances cognition compared to other primates
Credit: Willemvdk

(Phys.org) —New research shows that the human brain has higher levels of asymmetry than chimpanzees. This may be what elevates our cognition above that of other primates, according to the paper published in Proceedings of the Royal Society B today.

The human brain is asymmetric in structure and function, but until now it has been poorly understood how this compares with other primates. Researchers from The George Washington University analysed in vivo of 72 chimpanzees (aged 6 to 50 years old) and 73 humans (aged 18 to 60) . They found that the brain form of humans displays elevated levels of asymmetry compared to chimpanzees.

The flexible asymmetry of the human scans is caused by environmental factors during development. This signals enhanced plasticity in the evolving human brain which was fundamental in the development of human .

This is the first time that scientists have used in vivo MRI scans for this purpose. Comparing brain asymmetry in vivo rather than using fossilised skulls allowed Dr Aida Gómez-Robles and her team to observe the higher levels of fluctuating asymmetry in human brains. The researchers thus conclude that the more asymmetric may help explain our enhanced cognitive ability over chimpanzees and other primates.

Explore further: Oldest rove beetle in the Omaliini tribe found in French amber

More information: Gomez-Robles, A., Hopkins, W. and Sherwood, C. Increased morphological asymmetry, evolvability and plasticity in human brain evolution, Proceedings of the Royal Society B. dx.doi.org/10.1098/rspb.2013.0575

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