About the Authors

William D. Hopkins

whopkins4@gsu.edu

Affiliations Neuroscience Institute and Language Research Center, Georgia State University, Atlanta, Georgia, United States of America, Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America

Jamie Russell

Affiliations Neuroscience Institute and Language Research Center, Georgia State University, Atlanta, Georgia, United States of America, Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America

Joe McIntyre

Affiliation Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America

David A. Leavens

Affiliation Department of Psychology, University of Sussex, Sussex, England

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WDH JR. Performed the experiments: JR JM. Analyzed the data: WDH DAL. Wrote the paper: WDH DAL.