About the Authors

Jun Zhang

Affiliation Department of Psychology, University of Michigan, Ann Arbor, Michigan, United States of America

Kent C. Berridge

berridge@umich.edu

Affiliation Department of Psychology, University of Michigan, Ann Arbor, Michigan, United States of America

Amy J. Tindell

Affiliation Department of Psychology, University of Michigan, Ann Arbor, Michigan, United States of America

Kyle S. Smith

Affiliations Department of Psychology, University of Michigan, Ann Arbor, Michigan, United States of America, McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

J. Wayne Aldridge

Affiliation Department of Psychology, University of Michigan, Ann Arbor, Michigan, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JZ KCB AJT KSS JWA. Performed the experiments: AJT KSS. Analyzed the data: JZ AJT KSS JWA. Wrote the paper: JZ KCB JWA.