About the Authors

Kimberley A. Phillips

kimberley.phillips@trinity.edu

Affiliations Department of Psychology, Trinity University, San Antonio, Texas, United States of America, Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, Texas, United States of America

William D. Hopkins

Affiliations Department of Psychology, Agnes Scott College, Decatur, Georgia, United States of America, Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KAP WDH. Performed the experiments: KAP WDH. Analyzed the data: KAP. Wrote the paper: KAP WDH.