  Neural Correlates of Performance Variabilty during Motor Sequence AcquisitionAlbouy, Geneviève  ; ; Vandewalle, Gilles et alin NeuroImage (2012), 60(1), 324-331 Detailed reference viewed: 23 (3 ULg)The fate of incoming stimuli during NREM sleep is determined by spindles and the phase of the slow oscillation; Dang Vu, Thien Thanh ; et alin Frontiers in Neurology (2012), 3(40), 1-11 Detailed reference viewed: 8 (1 ULg) Working memory load affects chronotype- and time-of-day dependent cerebral activity modulationsSchmidt, Christina ; Peigneux, Philippe ; Leclercq, Yves et alin Journal of Sleep Research (2010), 19(Suppl. 2), Detailed reference viewed: 16 (3 ULg)Working memory load modulates time-of-day and chronotype effects on task-related BOLD activitySchmidt, Christina ; Peigneux, Philippe ; Leclercq, Yves et alin NeuroImage (2010), 51(Suppl. 1), Detailed reference viewed: 4 (3 ULg)Cerebral correlates of False Memories after Sleep and Sleep Deprivation; Dehon, Hedwige ; Sterpenich, Virginie et alPoster (2008, April) Detailed reference viewed: 4 (0 ULg)Active brain processes during human quiescent sleep: an EEG/fMRI study of non-REM slow oscillations; ; Desseilles, Martin et alin Journal of Neurology (2007, May), 254(Suppl. 3), 50 Detailed reference viewed: 2 (1 ULg)Wavelength-dependent modulation of brain responses to a working memory task by daytime light exposureVandewalle, Gilles ; ; Schabus, Manuel et alin 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 ▲] Detailed reference viewed: 18 (1 ULg)Hemodynamic cerebral correlates of sleep spindles during human non-rapid eye movement sleep.Schabus, Manuel ; Dang Vu, Thien Thanh ; Albouy, Geneviève et alin 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 ▲] Detailed reference viewed: 62 (12 ULg)Superiority of blue (470 nm) light in eliciting non-image forming brain responses during auditory working memory in humans: a fMRI studyVandewalle, Gilles ; ; et alin Journal of Sleep Research (2006, September), 15(Suppl. 1), 54 Detailed reference viewed: 23 (3 ULg)Active brain processes during human quiescent sleepDang Vu, Thien Thanh ; ; Balteau, Evelyne et alin Journal of Sleep Research (2006, September), 15(Suppl. 1), 51 Detailed reference viewed: 16 (1 ULg)Neural correlates of sleep spindles as revealed by simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (FMRI); ; Balteau, Evelyne et alin Journal of Sleep Research (2006, September), 15(Suppl. 1), 50-51 Detailed reference viewed: 8 (0 ULg) |
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