S. Fall

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An effective connectivity study was carried out on 16 young, healthy subjects performing an alertness task. The objective of this study was to develop and to evaluate a putative network model of alertness by adapting structural equation modeling to fMRI data. This study was designed to evaluate the directed interactivity of an attentional network during(More)
Horizontal gene transfer (HGT) is recognized as the major force for bacterial genome evolution. Yet, numerous questions remain about the transferred genes, their function, quantity and frequency. The extent to which genetic transformation by exogenous DNA has occurred over evolutionary time was initially addressed by an in silico approach using the complete(More)
PURPOSE This fMRI study investigated phonological and lexicosemantic processing in dyslexic and in chronological age- and reading level-matched children in a pseudoword reading task. MATERIALS AND METHODS The effective connectivity network was compared between the three groups using a structural model including the supramarginal cortex (BA 40; BA:(More)
VISION is the next generation science camera for the Navy Optical Interferometer (NOI). In comparison to the current beam combiner of NOI, VISION will deliver higher precision data products and better flexibility by incorporating single mode fibers for spatial filtering and by using low-noise detectors. VISION can coherently combine up to six telescope(More)
Functional magnetic resonance imaging (fMRI) was used to assess the contributions of movement preparation and execution of a visuomotor task in a cerebral motor network. The functional connectivity of the voxel time series between brain regions in the frequency space was investigated by performing spectral analysis of fMRI time series. The regional(More)
This study aimed to test the effect of Eucalyptus litter on growth, roots symbioses status and nutrition of Sahelian acacia’s seedlings. Sangalkam sandy soil was amended with two levels (1 and 5 %) of Eucalyptus litter. As control of the effect of litter addition, sandy soil was amended with 1 and 5 % of maize litter. In addition, a control without(More)
After having provided a brief reminder of the principle of the blood oxygen level-dependent (BOLD) contrast effect, the physiological bases of brain activity and the concepts of functional integration and effective connectivity, we describe the most recent approaches, which permit to explore brain activity and putative networks of interconnected active(More)
Functional magnetic resonance imaging (fMRI) permits to obtain physiological information about MRI signal, which is modulated by electrical, biochemical, and physiological properties of the cerebral tissue. It is possible to characterize the brain interactions from an fMRI signal. Particularly, the use of a spectral analysis at a given frequency allows(More)
AIM To validate, through functional magnetic resonance imaging (fMRI) from spectral analysis of time series during a visuomotor task, a model of functional connectivity mainly constituted by the pre-supplementary motor area (pre-SMA), the supplementary motor area proper (SMA-proper) and the primary motor cortex (M1). MATERIALS AND METHODS The paradigm(More)