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Research Article

Testosterone Administration Decreases Generosity in the Ultimatum Game

  • Paul J. Zak mail,

    paul@pauljzak.com

    Affiliation: Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California, United States of America

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  • Robert Kurzban,

    Affiliation: University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

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  • Sheila Ahmadi,

    Affiliation: Department of Endocrinology, University of California Los Angeles, Los Angeles, California, United States of America

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  • Ronald S. Swerdloff,

    Affiliation: Division of Endocrinology, Harbor University of California Los Angeles Medical Center, Torrance, California, United States of America

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  • Jang Park,

    Affiliation: Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California, United States of America

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  • Levan Efremidze,

    Affiliation: Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California, United States of America

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  • Karen Redwine,

    Affiliation: Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California, United States of America

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  • Karla Morgan,

    Affiliation: Department of Economics, Whitworth University, Spokane, Washington, United States of America

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  • William Matzner

    Affiliation: Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California, United States of America

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  • Published: December 16, 2009
  • DOI: 10.1371/journal.pone.0008330

About the Authors

Paul J. Zak, Jang Park, Levan Efremidze, Karen Redwine, William Matzner
Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California, United States of America
Robert Kurzban
University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
Sheila Ahmadi
Department of Endocrinology, University of California Los Angeles, Los Angeles, California, United States of America
Ronald S. Swerdloff
Division of Endocrinology, Harbor University of California Los Angeles Medical Center, Torrance, California, United States of America
Karla Morgan
Department of Economics, Whitworth University, Spokane, Washington, United States of America

Corresponding Author

Email: paul@pauljzak.com

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PZ RK RSS WM. Performed the experiments: PZ RK SA JP KM. Analyzed the data: PZ RK JP LE KR KM. Wrote the paper: PZ RK RSS WM.