About the Authors

David C. Geary, Mary K. Hoard, Lara Nugent
Department of Psychological Sciences, University of Missouri, Columbia, Missouri, United States of America

David C. Geary
Interdisciplinary Neuroscience Program, University of Missouri, Columbia, Missouri, United States of America

Drew H. Bailey
Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America

Corresponding Author

GearyD@Missouri.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DCG. Performed the experiments: MKH LN DHB. Analyzed the data: DCG DHB. Wrote the paper: DCG MKH LN.