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Research Article

Racial Differences in the Human Endogenous Circadian Period

  • Mark R. Smith,

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Helen J. Burgess,

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Louis F. Fogg,

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Charmane I. Eastman mail

    ceastman@rush.edu

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Published: June 30, 2009
  • DOI: 10.1371/journal.pone.0006014

About the Authors

Mark R. Smith, Helen J. Burgess, Louis F. Fogg, Charmane I. Eastman
Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

Corresponding Author

Email: ceastman@rush.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MRS HJB CE. Performed the experiments: MRS HJB. Analyzed the data: MRS LFF. Wrote the paper: MRS HJB LFF CE.