News FocusPhysiology

Setting the Human Clock: Technique Challenged

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Science  26 Jul 2002:
Vol. 297, Issue 5581, pp. 505
DOI: 10.1126/science.297.5581.505

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Four years ago, a study showed that people's sleep-wake cycles can be altered by shining light on the backs of their knees. But many researchers in the field were skeptical. Now circadian clock researchers report on page 571 that they have refuted the earlier study.