1. Department of Anthropology; Washington University in Saint Louis; Saint Louis Missouri
2. Congo Program, Wildlife Conservation Society; Brazzaville, Republic of Congo
3. Lester E. Fisher Center for the Study and Conservation of Apes; Lincoln Park Zoo; Chicago Illinois
4. Neuroscience Institute and Language Research Center; Georgia State University; Atlanta Georgia
5. Division of Developmental and Cognitive Neuroscience; Yerkes National Primate Research Center; Atlanta Georgia