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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

    X
  • Karen Redwine,

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

    X
  • Karla Morgan,

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

    X
  • William Matzner

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

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

Reader Comments (2)

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Total T units error correction

Posted by pzak on 20 Jun 2010 at 04:17 GMT

Upon reviewing our paper, free T values were incorrectly reported as ng/ml. The are actually pg/dl. To make all units comparable, we recommend that you divide all free T values by 100 to put them into pg/ml as these are the units in which total T and DHT are reported. This does not affect any of the statistical tests since the SEs are identical irrespective of units. My coauthors and I apologize for any confusion this has caused.

No competing interests declared.