About the Authors
- Hani D. Freeman
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* E-mail: hani.freeman@gmail.com
Affiliations Language Research Center, Georgia State University, Atlanta, Georgia, United States of America, Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, Illinois, United States of America
- Jennifer Sullivan
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Affiliation Wisconsin National Primate Research Center, University of Wisconsin, Madison, Wisconsin, United States of America
- Lydia M. Hopper
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Affiliations Language Research Center, Georgia State University, Atlanta, Georgia, United States of America, Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, Illinois, United States of America, Michale E. Keeling Center for Comparative Medicine and Research, UT MD Anderson Cancer Center, Bastrop, Texas, United States of America
- Catherine F. Talbot
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Affiliation Language Research Center, Georgia State University, Atlanta, Georgia, United States of America
- Andrea N. Holmes
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Affiliation Michale E. Keeling Center for Comparative Medicine and Research, UT MD Anderson Cancer Center, Bastrop, Texas, United States of America
- Nancy Schultz-Darken
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Affiliation Wisconsin National Primate Research Center, University of Wisconsin, Madison, Wisconsin, United States of America
- Lawrence E. Williams
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Affiliation Michale E. Keeling Center for Comparative Medicine and Research, UT MD Anderson Cancer Center, Bastrop, Texas, United States of America
- Sarah F. Brosnan
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Affiliations Language Research Center, Georgia State University, Atlanta, Georgia, United States of America, Michale E. Keeling Center for Comparative Medicine and Research, UT MD Anderson Cancer Center, Bastrop, Texas, United States of America, Department of Psychology, Philosophy & Neuroscience Institute, Georgia State University, Atlanta, Georgia, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: SFB NS-D LEW. Performed the experiments: HDF JS LMH CFT ANH. Analyzed the data: SFB HDF LMH NS-D CFT. Contributed reagents/materials/analysis tools: NS-D LEW. Wrote the paper: HDF SFB LMH JS CFT LEW NS-D ANH.