About the Authors

Kari L. Allen

kari.allen@wustl.edu

Affiliation Department of Anatomy & Neurobiology, Washington University Medical School, 660 S. Euclid Ave., Box 8108, St. Louis, Missouri 63110, United States of America

Siobhán B. Cooke

Affiliation Department of Anthropology, Northeastern Illinois University, 5500 N. St. Louis Avenue Chicago, Illinois 60625, United States of America

Lauren A. Gonzales

Affiliation Department of Evolutionary Anthropology, Duke University, Box 90383, Durham, North Carolina 27708, United States of America

Richard F. Kay

Affiliation Department of Evolutionary Anthropology, Duke University, Box 90383, Durham, North Carolina 27708, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KLA SBC LAG RFK. Performed the experiments: KLA SBC LAG RFK. Analyzed the data: KLA SBC LAG RFK. Contributed reagents/materials/analysis tools: KLA SBC LAG RFK. Wrote the paper: KLA SBC LAG RFK.