References of "Gais, S"
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See detailNeural Correlates of Performance Variabilty during Motor Sequence Acquisition
Albouy, Geneviève ULg; Sterpenich, V.; Vandewalle, Gilles ULg et al

in NeuroImage (2012), 60(1), 324-331

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See detailThe fate of incoming stimuli during NREM sleep is determined by spindles and the phase of the slow oscillation
Schabus, M.; Dang Vu, Thien Thanh ULg; Heib, D. P. J. et al

in Frontiers in Neurology (2012), 3(40), 1-11

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See detailWorking memory load affects chronotype- and time-of-day dependent cerebral activity modulations
Schmidt, Christina ULg; Peigneux, Philippe ULg; Leclercq, Yves ULg et al

in Journal of Sleep Research (2010), 19(Suppl. 2),

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See detailCerebral correlates of False Memories after Sleep and Sleep Deprivation
Darsaud, A.; Dehon, Hedwige ULg; Sterpenich, Virginie ULg et al

Poster (2008, April)

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See detailActive brain processes during human quiescent sleep: an EEG/fMRI study of non-REM slow oscillations
Dang-Vu, T.; Schabus, M.; Desseilles, Martin ULg et al

in Journal of Neurology (2007, May), 254(Suppl. 3), 50

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See detailWavelength-dependent modulation of brain responses to a working memory task by daytime light exposure
Vandewalle, Gilles ULg; Gais, S.; Schabus, Manuel ULg et al

in Cerebral Cortex (2007), 17(12), 2788-2795

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 ... [more ▼]

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. [less ▲]

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See detailHemodynamic cerebral correlates of sleep spindles during human non-rapid eye movement sleep.
Schabus, Manuel ULg; Dang Vu, Thien Thanh ULg; Albouy, Geneviève ULg et al

in Proceedings of the National Academy of Sciences of the United States of America (2007), 104(32), 13164-9

In humans, some evidence suggests that there are two different types of spindles during sleep, which differ by their scalp topography and possibly some aspects of their regulation. To test for the ... [more ▼]

In humans, some evidence suggests that there are two different types of spindles during sleep, which differ by their scalp topography and possibly some aspects of their regulation. To test for the existence of two different spindle types, we characterized the activity associated with slow (11-13 Hz) and fast (13-15 Hz) spindles, identified as discrete events during non-rapid eye movement sleep, in non-sleep-deprived human volunteers, using simultaneous electroencephalography and functional MRI. An activation pattern common to both spindle types involved the thalami, paralimbic areas (anterior cingulate and insular cortices), and superior temporal gyri. No thalamic difference was detected in the direct comparison between slow and fast spindles although some thalamic areas were preferentially activated in relation to either spindle type. Beyond the common activation pattern, the increases in cortical activity differed significantly between the two spindle types. Slow spindles were associated with increased activity in the superior frontal gyrus. In contrast, fast spindles recruited a set of cortical regions involved in sensorimotor processing, as well as the mesial frontal cortex and hippocampus. The recruitment of partially segregated cortical networks for slow and fast spindles further supports the existence of two spindle types during human non-rapid eye movement sleep, with potentially different functional significance. [less ▲]

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See detailSuperiority of blue (470 nm) light in eliciting non-image forming brain responses during auditory working memory in humans: a fMRI study
Vandewalle, Gilles ULg; Gais, S.; Schabus, M. et al

in Journal of Sleep Research (2006, September), 15(Suppl. 1), 54

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See detailActive brain processes during human quiescent sleep
Dang Vu, Thien Thanh ULg; Schabus, M.; Balteau, Evelyne ULg et al

in Journal of Sleep Research (2006, September), 15(Suppl. 1), 51

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See detailNeural correlates of sleep spindles as revealed by simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (FMRI)
Schabus, M.; Dang-Vu, T.; Balteau, Evelyne ULg et al

in Journal of Sleep Research (2006, September), 15(Suppl. 1), 50-51

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