About the Authors

Anna G. Warrener

awarrener@fas.harvard.edu

Affiliation Department of Human Evolutionary Biology, Harvard University, 11 Divinity Avenue, Cambridge, Massachusetts, 02138, United States of America

Kristi L. Lewton

Affiliation Department of Anatomy and Neurobiology, Boston University School of Medicine, 72 East Concord St. (L 1004), Boston, Massachusetts, 02118, United States of America

Herman Pontzer

Affiliation Department of Anthropology, Hunter College, 695 Park Ave., New York, New York, 10065, United States of America

Daniel E. Lieberman

Affiliation Department of Human Evolutionary Biology, Harvard University, 11 Divinity Avenue, Cambridge, Massachusetts, 02138, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AGW KLL HP DEL. Performed the experiments: AGW KLL. Analyzed the data: AGW KLL. Contributed reagents/materials/analysis tools: AGW HP DEL. Wrote the paper: AGW KLL HP DEL.