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Riemersma-van der Lek RF1, Swaab DF, Twisk J, Hol EM, Hoogendijk WJ, Van Someren EJ (2008).
Effect of Bright Light and Melatonin on Cognitive and Noncognitive Function in Elderly Residents of Group Care Facilities. JAMA
http://jamanetwork.com/journals/jama/fullarticle/273623
In this study published in the Journal of American Medical Association, Dutch scientists tested whether day-long light exposure sufficient to affect the circadian rhythm can slow down the rate of cognitive decline in Persons with moderate dementia living in 12 group-care facilities. This was accomplished through the use of ceiling-mounted fixtures with Plexiglas diffusers containing an equal amount of Philips TLD 840 and 940 fluorescent tubes, turned on between approximately 9 AM and 6 PM to achieve an exposure of approximately 1000 lux. In 3.5 years of follow-up, this light condition was able to improve a measure of cognitive function (Mini-Mental State Examination) by 0.9 points at all time points, mood and daily functions.