Reference : Wavelength-dependent modulation of brain responses to a working memory task by daytime l...
Scientific journals : Article
Social & behavioral sciences, psychology : Neurosciences & behavior
http://hdl.handle.net/2268/2886
Wavelength-dependent modulation of brain responses to a working memory task by daytime light exposure
English
Vandewalle, Gilles mailto [Université de Liège - ULG > Centre de Recherches du Cyclotron > > >]
Gais, S. [> > > >]
Schabus, Manuel [Université de Liège - ULg > > Centre de recherches du cyclotron >]
Balteau, Evelyne mailto [Université de Liège - ULg > > Centre de recherches du cyclotron >]
Carrier, J. [> > > >]
Darsaud, A. [> > > >]
Sterpenich, Virginie [Université de Liège - ULg > > Centre de recherches du cyclotron >]
Albouy, Geneviève [Université de Liège - ULg > > Centre de recherches du cyclotron >]
Dijk, D. J. [> > > >]
Maquet, Pierre mailto [Université de Liège - ULg > > Centre de recherches du cyclotron]
2007
Cerebral Cortex
Oxford Univ Press Inc
17
12
2788-2795
Yes (verified by ORBi)
International
1047-3211
1460-2199
Cary
[en] circadian rhythms ; functional magnetic resonance imaging ; human cognition ; light exposure ; melanopsin ; Cerebral Cortex/physiology/radiation effects ; Cognition/physiology/radiation effects ; Radiation Dosage ; Sunlight
[en] In addition to classical visual effects, light elicits nonvisual brain responses, which profoundly influence physiology and behavior. These effects are mediated in part by melanopsin-expressing light-sensitive ganglion cells that, in contrast to the classical photopic system that is maximally sensitive to green light (550 nm), is very sensitive to blue light (470-480 nm). At present, there is no evidence that blue light exposure is effective in modulating nonvisual brain activity related to complex cognitive tasks. Using functional magnetic resonance imaging, we show that, while participants perform an auditory working memory task, a short (18 min) daytime exposure to blue (470 nm) or green (550 nm) monochromatic light (3 x 10(13) photons/cm(2)/s) differentially modulates regional brain responses. Blue light typically enhanced brain responses or at least prevented the decline otherwise observed following green light exposure in frontal and parietal cortices implicated in working memory, and in the thalamus involved in the modulation of cognition by arousal. Our results imply that monochromatic light can affect cognitive functions almost instantaneously and suggest that these effects are mediated by a melanopsin-based photoreceptor system.
http://hdl.handle.net/2268/2886
also: http://hdl.handle.net/2268/86813
10.1093/cercor/bhm007
http://cercor.oxfordjournals.org/cgi/content/abstract/17/12/2788

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
vandewallecerebralcortex2007.pdfPublisher postprint425.03 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.