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Related Experiment Videos

Photons, clocks, and consciousness.

George C Brainard1, John P Hanifin

  • 1Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA. george.brainard@jefferson.edu

Journal of Biological Rhythms
|August 4, 2005
PubMed
Summary
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Light significantly influences human consciousness and circadian rhythms. New research highlights blue light

Area of Science:

  • Chronobiology and Neuroscience
  • Photobiology and Visual System Research

Background:

  • Light profoundly impacts human consciousness and regulates the body's circadian system, affecting nearly all tissues.
  • Action spectroscopy has been used for over 25 years to understand wavelength sensitivity in circadian input.
  • The discovery of melanopsin in intrinsically photosensitive retinal ganglion cells revolutionized understanding of circadian phototransduction.

Purpose of the Study:

  • To investigate the wavelength sensitivity of the human circadian system.
  • To compare the spectral sensitivity of the melanopsin system with classic visual photoreceptors.
  • To explore potential applications of these findings in light therapy and architectural design.

Main Methods:

  • Utilized action spectroscopy techniques to determine wavelength sensitivity.
Keywords:
NASA Discipline Space Human FactorsNon-NASA Center

Related Experiment Videos

  • Studied human subjects, alongside data from rodents and nonhuman primates.
  • Compared the action spectrum of the intrinsically photosensitive retinal ganglion cells system with rod and cone photoreceptor sensitivities.

    • Main Results:

    • Human circadian system's peak wavelength sensitivity is in the blue portion of the spectrum, mediated by melanopsin.
    • This sensitivity profile differs significantly from the three-cone photopic visual system and individual rod/cone photoreceptors.
    • Classic visual photoreceptors (rods and cones) also contribute input to the circadian system, despite a different spectral fingerprint.

    Conclusions:

    • The discovery of a distinct blue-light sensitive pathway (melanopsin) is crucial for understanding circadian regulation.
    • Findings suggest that both melanopsin and classic photoreceptors play roles in circadian phototransduction.
    • These insights pave the way for novel light therapies for circadian and mood disorders and inform architectural lighting strategies.