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Light-sensitive brain pathways and aging.

V Daneault1,2,3, M Dumont4, É Massé5,4

  • 1Functional Neuroimaging Unit, University of Montreal Geriatric Institute, Montreal, QC, Canada. veronique.daneault@gmail.com.

Journal of Physiological Anthropology
|March 17, 2016
PubMed
Summary
This summary is machine-generated.

Light significantly impacts non-image-forming (NIF) functions, with blue light being most effective. Aging reduces sensitivity to light for cognitive tasks more than for pupillary responses.

Keywords:
AgingBrainLightNon-image-forming (NIF) functions

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Chronobiology

Background:

  • Light influences non-image-forming (NIF) functions beyond vision, including alertness, sleep-wake cycles, and cognitive performance.
  • NIF functions exhibit maximal sensitivity to blue light wavelengths (460-480 nm), impacting melatonin suppression, pupillary response, and cognitive function.
  • Aging is associated with reduced sensitivity in some NIF functions, potentially due to changes in neural pathways and ocular mechanisms.

Purpose of the Study:

  • To elucidate the neural pathways mediating light's effects on NIF functions.
  • To investigate age-related changes in ocular and cerebral mechanisms affecting NIF light sensitivity.
  • To compare the impact of aging on pupillary constriction and cognitive brain sensitivity to light.

Main Methods:

  • Review of neural pathways for light's NIF effects.
  • Discussion of age-related ocular and cerebral changes impacting light sensitivity.
  • Experimental investigation of pupillary constriction and cognitive responses to light across the lifespan.

Main Results:

  • Light's impact on cognitive brain responses significantly decreases with age.
  • Pupillary constriction sensitivity to light appears more preserved throughout the lifespan compared to cognitive functions.
  • Neural pathways underlying NIF functions exhibit differential sensitivity to light, which is affected differently by aging.

Conclusions:

  • Aging differentially affects light sensitivity across various NIF functions.
  • Cognitive functions show a more substantial decline in light sensitivity with age than pupillary responses.
  • Future aging research must consider the diverse pathways and varying light sensitivities of NIF functions.