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In humans, http://www.selleckchem.com/products/carfilzomib-pr-171.html there has also been evidence of modulation of the sensitivity of the melatonin-suppressing response by prior lighting conditions (H��bert et al. 2002; Smith et al. 2004; Jasser et al. 2006). The first study to demonstrate photic adaptation in humans (H��bert et al. 2002) compared the amount of melatonin suppression caused by a nighttime 3 h light stimulus (500 lux) following 1 week of exposure to daytime bright light (5000�C7000 lux ambient) vs. 1 week of daytime dim light ( http://www.selleckchem.com/products/azd9291.html et al. 2006). None of these studies, however, could assess whether prior light history also affects the phase-resetting capacity of light in humans, the property most clinically relevant for the treatment of circadian rhythm sleep disorders, including delayed sleep phase syndrome, advanced sleep phase syndrome, non-24 h sleep/wake disorder, shift work sleep disorder, and jet lag (Sack et al. 2007a,b). In the current study we present results that support previous findings on the adaptation of melatonin suppression and further expand upon these studies by showing adaptation of the phase-shifting response. Here, we demonstrate that prior photic history modulates (i) the phase resetting capacity and (ii) the magnitude of the melatonin suppression in response to a subsequent sub-saturating light exposure. The research study consisted of a 32 day in-patient protocol. The controlled, randomized, single-blinded, crossover study was designed http://en.wikipedia.org/wiki/YES1 to compare the effects of two prior light conditions on the melatonin suppression and phase resetting responses to a subsequent light exposure (LE). A total of four LEs were administered to each subject: two experimental LEs and two control LEs. Each LE lasted 6.5 h in duration and was scheduled to occur during the beginning of the subjective night in order to induce maximal phase delays and melatonin suppression by the experimental LEs. The purpose of the control LEs was to insure that any phase shift measured following the experimental LEs was due to the light and not other non-photic factors of the protocol itself.