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Blue light improves cognitive performance


A newly discovered system of photoreceptors for circadian rhythms works non-visual and responds to blue light (460 nm). We report a longitudinal study in 44 adults, showing that a significant increase in alertness and speed of information processing could be achieved by blue light as compared to normal light.

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  • DM Berson FA Dunn M Takao (2002) ArticleTitlePhototransduction by retinal ganglion cells that set the circadian clock Science 295 1070–1073 Occurrence Handle11834835 Occurrence Handle10.1126/science.1067262 Occurrence Handle1:CAS:528:DC%2BD38Xht1Gru7g%3D

    PubMed  Article  CAS  Google Scholar 

  • GC Brainard JP Hanifin (2005) ArticleTitlePhotons, clocks, and consciousness J Biol Rhythms 20 314–325 Occurrence Handle16077151 Occurrence Handle10.1177/0748730405278951 Occurrence Handle1:CAS:528:DC%2BD2MXntVWqur8%3D

    PubMed  Article  CAS  Google Scholar 

  • GC Brainard JP Hanifin JM Greeson B Byrne G Glickman E Gerner MD Rollag (2001) ArticleTitleAction spectrum for melatonin regulation in humans: evidence for a novel circadian photoreceptor J Neurosci 21 6405–6412 Occurrence Handle11487664 Occurrence Handle1:CAS:528:DC%2BD3MXlvFKmurk%3D

    PubMed  CAS  Google Scholar 

  • C Cajochen M Münch S Kobialka K Kräuchi R Steiner P Oelhafen S Orgül A Wirz-Justice (2005) ArticleTitleHigh sensitivity of human melatonin, alertness, thermoregulation, and heart rate to short wavelength light J Clin Endocrinol Metab 90 1311–1316 Occurrence Handle15585546 Occurrence Handle10.1210/jc.2004-0957 Occurrence Handle1:CAS:528:DC%2BD2MXisVOhsrs%3D

    PubMed  Article  CAS  Google Scholar 

  • CA Czeisler TL Shanahan EB Klerman H Martens DJ Brotman JS Emens T Klein JF Rizzo Suffix3rd (1995) ArticleTitleSuppression of melatonin secretion in some blind patients by exposure to bright light N Engl J Med 332 6–11 Occurrence Handle7990870 Occurrence Handle10.1056/NEJM199501053320102 Occurrence Handle1:STN:280:ByqD1c3osVA%3D

    PubMed  Article  CAS  Google Scholar 

  • HJ Eysenck MW Eysenck (1985) Personality and individual differences Plenum New York

    Google Scholar 

  • Figueiro MG, Rea MS (2005) LEDs: improving the sleep quality of older adults. Proc. CIE Midterm Meeting and International Lighting Congress. Leon, Spain, May 18–21

  • MG Figueiro MS Rea G Eggleston (2003) ArticleTitleLight therapy and Alzheimers’s disease. Sleep Review J Sleep Special 4 24

    Google Scholar 

  • DG Gubin GD Gubin J Waterhouse D Weinert (2006) ArticleTitleThe circadian body temperature rhythm in the elderly: effect of single daily melatonin dosing Chronobiol Int 23 639–658 Occurrence Handle16753947 Occurrence Handle10.1080/07420520600650612 Occurrence Handle1:CAS:528:DC%2BD28XnsFGrtLo%3D

    PubMed  Article  CAS  Google Scholar 

  • M Haider (1969) Elektrophysiologische Indikatoren der Aktivierung W Schönpflug (Eds) Methoden der Aktivierungsforschung Huber Stuttgart

    Google Scholar 

  • S Lehrl B Fischer (1990) ArticleTitleA basic information psychological parameter (BIP) for the reconstruction of concepts of intelligence Eur J Person 4 259–286

    Google Scholar 

  • SW Lockley GC Brainard CA Czeisler (2003) ArticleTitleHigh sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light J Clin Endocrinol Metab 88 4502–4505 Occurrence Handle12970330 Occurrence Handle10.1210/jc.2003-030570 Occurrence Handle1:CAS:528:DC%2BD3sXntlagtrw%3D

    PubMed  Article  CAS  Google Scholar 

  • SW Lockley EE Evans FA Scheer GC Brainard CA Czeisler D Aeschbach (2006) ArticleTitleShort-wavelength sensitivity for the direct effects of light on alertness, vigilance, and the waking electroencephalogram in humans Sleep 29 161–168 Occurrence Handle16494083

    PubMed  Google Scholar 

  • K Thapan J Arendt DJ Skene (2001) ArticleTitleAn action spectrum for melatonin suppression: evidence for a novel non-rod, non-cone photoreceptor system in humans J Physiol 535 IssueIDPt 1 261–267 Occurrence Handle11507175 Occurrence Handle10.1111/j.1469-7793.2001.t01-1-00261.x Occurrence Handle1:CAS:528:DC%2BD3MXms12lurc%3D

    PubMed  Article  CAS  Google Scholar 

  • RM Yerkes JD Dodson (1908) ArticleTitleThe relation of strength of stimulus to rapidity of habit-formation J Comp Neurol Psychol 18 459–482 Occurrence Handle10.1002/cne.920180503

    Article  Google Scholar 

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Lehrl, S., Gerstmeyer, K., Jacob, J. et al. Blue light improves cognitive performance. J Neural Transm 114, 457–460 (2007).

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  • Keywords: Blue light, circadian rhythm, cognitive efficiency, alertness, speed of information processing