Article (Scientific journals)
Brain responses to violet, blue, and green monochromatic light exposures in humans: prominent role of blue light and the brainstem
Vandewalle, Gilles; Schmidt, Christina; Albouy, Geneviève et al.
2007In PLoS ONE, 2 (11), p. 1247
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Keywords :
Adult; Analysis of Variance; Behavior; Brain Stem/*physiology; *Color; Female; Humans; *Light; Magnetic Resonance Imaging; Male; Positron-Emission Tomography
Abstract :
[en] BACKGROUND: Relatively long duration retinal light exposure elicits nonvisual responses in humans, including modulation of alertness and cognition. These responses are thought to be mediated in part by melanopsin-expressing retinal ganglion cells which are more sensitive to blue light than violet or green light. The contribution of the melanopsin system and the brain mechanisms involved in the establishment of such responses to light remain to be established. METHODOLOGY/PRINCIPAL FINDINGS: We exposed 15 participants to short duration (50 s) monochromatic violet (430 nm), blue (473 nm), and green (527 nm) light exposures of equal photon flux (10(13)ph/cm(2)/s) while they were performing a working memory task in fMRI. At light onset, blue light, as compared to green light, increased activity in the left hippocampus, left thalamus, and right amygdala. During the task, blue light, as compared to violet light, increased activity in the left middle frontal gyrus, left thalamus and a bilateral area of the brainstem consistent with activation of the locus coeruleus. CONCLUSION/SIGNIFICANCE: These results support a prominent contribution of melanopsin-expressing retinal ganglion cells to brain responses to light within the very first seconds of an exposure. The results also demonstrate the implication of the brainstem in mediating these responses in humans and speak for a broad involvement of light in the regulation of brain function.
Disciplines :
Radiology, nuclear medicine & imaging
Author, co-author :
Vandewalle, Gilles  ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Schmidt, Christina  ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Albouy, Geneviève ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Sterpenich, Virginie ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Darsaud, Annabelle ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Rauchs, Géraldine;  Université de Liège - ULiège > Centre de recherches du cyclotron
Berken, Pierre-Yves
Balteau, Evelyne ;  Université de Liège - ULiège > Centre de recherches du cyclotron - Département de physique
Degueldre, Christian ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Luxen, André ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie organique de synthèse - Centre de recherches du cyclotron
Maquet, Pierre  ;  Centre Hospitalier Universitaire de Liège - CHU > Neurologie Sart Tilman
Dijk, Derk-Jan
Language :
English
Title :
Brain responses to violet, blue, and green monochromatic light exposures in humans: prominent role of blue light and the brainstem
Publication date :
2007
Journal title :
PLoS ONE
eISSN :
1932-6203
Publisher :
Public Library of Science, San Franscisco, United States - California
Volume :
2
Issue :
11
Pages :
e1247
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
2007/11/29
Available on ORBi :
since 08 April 2011

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