[1] George Washington Univ, Anthropol, Washington, DC 20052 USA
[2] Georgia State Univ, Neurosci Inst, Atlanta, GA 30303 USA
[3] Yerkes Natl Primate Res Ctr, Psychobiol, Atlanta, GA USA
[4] Kennesaw State Univ, Biol & Phys, Kennesaw, GA USA
[5] Univ Calif Davis, Psychiat & Behav Sci, Davis, CA USA
[6] Icahn Sch Med Mt Sinai, Neurosci, New York, NY 10029 USA