About the Authors
Volen Center for Complex Systems, Brandeis University, Waltham, Massachusetts, United States of America
Department of Psychology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
The authors have declared that no competing interests exist.
KMV, EK, MJK, and RS conceived and designed the experiments. KMV and EK performed the experiments. KMV analyzed the data and contributed reagents/materials/analysis tools. KMV and RS wrote the paper.