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. 2007 Nov 28;2(11):e1247. doi: 10.1371/journal.pone.0001247

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Vandewalle et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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a. General timeline. Time relative to scheduled wake time (hrs). Arrows: subjective sleepiness assessment (SS 1-7). b. Timeline of the fMRI period and light condition organization. Black bars indicate occurrence of the different conditions. Note that the combination of light 1 and 2 changes from one session to the other. S1-3: sessions 1 to 3 during which 3 combinations of light are employed (combination order is given as example). Time in minutes after entering the scanner. Arrows: subjective sleepiness assessment (SS 5-7).