About the Authors
Leverhulme Centre for Human Evolutionary Studies, Department of Biological Anthropology, University of Cambridge, Cambridge, United Kingdom
Cécile and Oskar Vogt Institute for Brain Research, Heinrich-Heine-University, Düsseldorf, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JBS AS KZ. Performed the experiments: JBS. Analyzed the data: JBS LV. Contributed reagents/materials/analysis tools: JBS AS KZ. Wrote the paper: JBS LV.