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Correspondence: E. Feczko, Yerkes Primate National Research Center, Emory University, 954 Gatewood Rd NE, Atlanta, GA 30329, U.S.A. Email: efeczko@emory.edu (E. Feczko).
Support for this research was provided by the National Institute of Mental Health grant R01MH096983 (L.J.Y. and L.A.P.).
Additional support was provided by the National Institutes of Health grant OD P51OD011132 to Yerkes Primate National Research Center, Emory University.
Financial support was provided by the Wenner-Gren Foundations (H.W.).
© 2015 The Association for the Study of Animal Behaviour.