Lars K. Hansen

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Neuroimaging studies of learning focus on brain areas where the activity changes as a function of time. To circumvent the difficult problem of model selection, we used a data-driven analytic tool, cluster analysis, which extracts representative temporal and spatial patterns from the voxel-time series. The optimal number of clusters was chosen using a(More)
The problem of blindly estimating multiple digital co-channel communication signals using an antenna array is studied in the presence of multipath fading. We develop a fast sequential-estimation algorithm for separating multiuser signals based on the geometric observation made by Hansen and Xu in 22. When the signals are constrained to a nite alphabet, it(More)
List of key features Dwarfism Foetal growth retardation Microcephaly Mutation Nucleotides Osteochondrodysplasias RNA, small nuclear Spliceosomes Syndrome Microcephalic osteodysplastic primordial dwarfism, type 1 Introduction Taybi–Linder syndrome or microcephalic osteodysplastic primordial dwarfism type 1 (MOPD1) (MIM # 210710) is a rare autosomal recessive(More)
—Localization of brain activity involves solving the EEG inverse problem, which is an undetermined ill-posed problem. We propose a novel approach consisting in estimating, using structured sparsity regularization techniques, the Brain Electrical Sources (BES) matrix directly in the source space. We use proximal optimization methods, which are efficient(More)
PURPOSE Akathisia remains a common side effect especially from antipsychotic medication. If the condition is diagnosed the management options are limited. SUBJECTS/METHODOLOGY: We tested a structured relaxation program on nine patients with a diagnosis of schizophrenia suffering from akathisia. All patients were rated on Barnes Akathisia Scale (BAS) before(More)