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Author Notes:

Correspondence: Dr W. D. Hopkins, as above. E-mail: whopkin@emory.edu or whopkins@agnesscott.edu

The Yerkes Center is fully accredited by the American Association for Accreditation of Laboratory Animal Care, and APA guidelines for the ethical treatment of animals were adhered to during all aspects of this study.

Special thanks to the veterinary staff for assisting in the care of the animals during scanning.


Research Funding:

This work was supported in part by NIH grants RR-00165, NS-42867, NS-36605 and HD-38051.


  • brain asymmetry
  • handedness
  • non-human primates
  • white matter

Behavioral and neuroanatomical correlates of white matter asymmetries in chimpanzees (Pan troglodytes)


Journal Title:

European Journal of Neuroscience


Volume 25, Number 8


, Pages 2565-2570

Type of Work:

Article | Post-print: After Peer Review


Although behavioral and brain asymmetries have been documented in non-human primates, lateralization in cortical connectivity as reflected in white matter has not been described in any species, despite the intrinsic theoretical interest in white matter expansion during primate brain evolution. Here we report evidence of population-level leftward asymmetries in the white matter of chimpanzees. We further report that lateralization in white matter correlates with their handedness as well as neuroanatomical asymmetries in the precentral gyrus. These findings suggest that chimpanzees show asymmetries in cortical connectivity and these may serve as the foundation for morphological and behavioral laterality in primates, including humans.

Copyright information:

© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd

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