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Research Article

Plasticity of the Intrinsic Period of the Human Circadian Timing System

  • Frank A. J. L. Scheer mail,

    To whom correspondence should be addressed. E-mail: fscheer@rics.bwh.harvard.edu

    Affiliation: Division of Sleep Medicine, Department of Medicine, Brigham & Women's Hospital and Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

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  • Kenneth P. Wright Jr.,

    Affiliation: Division of Sleep Medicine, Department of Medicine, Brigham & Women's Hospital and Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

    Current address: Sleep and Chronobiology Laboratory, Department of Integrative Physiology, Center for Neuroscience, University of Colorado, Boulder, Colorado, United States of America

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  • Richard E. Kronauer,

    Affiliation: Division of Sleep Medicine, Department of Medicine, Brigham & Women's Hospital and Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

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  • Charles A. Czeisler

    Affiliation: Division of Sleep Medicine, Department of Medicine, Brigham & Women's Hospital and Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

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  • Published: August 08, 2007
  • DOI: 10.1371/journal.pone.0000721

About the Authors

Frank A. J. L. Scheer, Kenneth P. Wright Jr., Richard E. Kronauer, Charles A. Czeisler
Division of Sleep Medicine, Department of Medicine, Brigham & Women's Hospital and Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

Corresponding Author

Email: fscheer@rics.bwh.harvard.edu

Competing Interests

Potential competing interests for all authors are fully detailed in the Acknowledgments section.

Author Contributions

Conceived and designed the experiments: CC RK KW. Performed the experiments: FS KW. Analyzed the data: CC RK FS KW. Wrote the paper: CC FS KW.