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Estimated marginal means and standard error plotted as a function of light condition (2500 K vs. 7000 K light) and time of testing (all night shifts included). (A) Response times (RT) for the 10% fastest RTs on the Psychomotor Vigilance Task (PVT). (B) Mean resiprocal RTs (1/RT) for the 10% slowest RTs on the PVT. *p < 0.05 between light conditions.
