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To whom correspondence may be sent at the present address: Sarah F. Brosnan, Department of Psychology, Georgia State University, P.O. Box 5010, Atlanta, GA 30302-5010., Email: sbrosnan@gsu.edu.
To whom correspondence may be addressed: Frans B. M. de Waal, Email: dewaal@emory.edu.
M.v.W., S.F.B., and F.B.M.d.W. designed research.
M.v.W. performed research.
M.v.W., S.F.B., and F.B.M.d.W. analyzed data.
M.v.W., S.F.B., and F.B.M.d.W. wrote the paper.
We thank J. Andreoni and L. Santos for helpful comments on an earlier version of this manuscript, M. Dindo for assistance with testing, and the animal care and veterinary staff for maintaining the health of our study subjects.
The Yerkes Primate Center is fully accredited by the American Association for Accreditation of Laboratory Animal Care.
The authors declare no conflict of interest.
This work was supported by Grant IBN-0077706 from the National Science Foundation (to F.B.M.d.W.) and Basegrant RR-00165 from the National Institutes of Health (NIH) (to the Yerkes National Primate Research Center).
S.F.B. was supported in part by NIH Institutional Research and Academic Career Development Grant K12 GM00680–05 (to Emory University).
© 2007 by The National Academy of Sciences