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A “cognitive stress test” can be used to bring out astute brain irregularities that would otherwise stay undetected during a resting state functional Magnetic Resonance Imaging (fMRI). Hemodynamic Response Function (HRF) may be used to distinguish non-demented and demented Alzheimer's Type (DAT) from young adults. Previous studies have reported opposite findings for Blood-Oxygenation-Level-Dependent...
Non-parametric Hemodynamic Response Function (HRF) estimation in noisy functional Magnetic Resonance Imaging (fMRI) plays an important role when investigating the temporal dynamics of regional brain responses during activation. Making use of a semiparametric model to characterize the fMRI time series and a sparsity assumption on the HRF, a new method for voxelwise non-parametric HRF estimation is...
Extracting region-specific hemodynamic response function (HRF) from overlapping ROIs of activated areas in the brain in noisy functional Magnetic Resonance Imaging (fMRI) data is essential when analyzing the temporal dynamics of a brain region response and its neuronal coupling for functional and effective connectivity. Based on the assumption of spatially sparse brain hemodynamics, HRFs from jointly...
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