33 research outputs found

    Représentations continue et discrÚte de la connectivité structurelle des fibres en U du sillon central

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    International audienceU-shape fibers are superficial white matter fibers connecting adjacent gyri. In this paper, we present a method to characterize the connectivity of U-shape fibers coursing around the central sulcus. Pre-and post-central gyral crests are semi-automatically drawn and used to build a connectivity space that is identical between subjects. This group space provides a dense representation of the short-range connectivity between the two gyri, as well as a structured representation after clustering

    A História da Alimentação: balizas historiogråficas

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    Os M. pretenderam traçar um quadro da HistĂłria da Alimentação, nĂŁo como um novo ramo epistemolĂłgico da disciplina, mas como um campo em desenvolvimento de prĂĄticas e atividades especializadas, incluindo pesquisa, formação, publicaçÔes, associaçÔes, encontros acadĂȘmicos, etc. Um breve relato das condiçÔes em que tal campo se assentou faz-se preceder de um panorama dos estudos de alimentação e temas correia tos, em geral, segundo cinco abardagens Ia biolĂłgica, a econĂŽmica, a social, a cultural e a filosĂłfica!, assim como da identificação das contribuiçÔes mais relevantes da Antropologia, Arqueologia, Sociologia e Geografia. A fim de comentar a multiforme e volumosa bibliografia histĂłrica, foi ela organizada segundo critĂ©rios morfolĂłgicos. A seguir, alguns tĂłpicos importantes mereceram tratamento Ă  parte: a fome, o alimento e o domĂ­nio religioso, as descobertas europĂ©ias e a difusĂŁo mundial de alimentos, gosto e gastronomia. O artigo se encerra com um rĂĄpido balanço crĂ­tico da historiografia brasileira sobre o tema

    Douleurs à la phase aiguë et à distance d'un infarctus médullaire : étude rétrospective, multicentrique

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    L'infarctus mĂ©dullaire est une pathologie rare qui reprĂ©sente 5 Ă  8% des myĂ©lopathies aiguĂ«s et environ 1 Ă  2% des pathologies neurologiques d'origine vasculaire. Le diagnostic repose sur un tableau clinique Ă©vocateur et la rĂ©alisation d'une imagerie par rĂ©sonance magnĂ©tique. Le pronostic fonctionnel et en particuliers douloureux Ă  la phase aiguĂ« et Ă  distance des infarctus mĂ©dullaires est peu connu. Objectifs : l'objectif de notre travail est de dĂ©crire les douleurs Ă  la phase aiguĂ« et Ă  6 mois et plus des patients ayant prĂ©sentĂ© un infarctus mĂ©dullaire et d'identifier des facteurs associĂ©s Ă  la prĂ©sence de douleurs. MatĂ©riel et mĂ©thode : il s'agit d'une Ă©tude rĂ©trospective, multicentrique portant sur les patients atteints d'infarctus mĂ©dullaire hospitalisĂ©s entre le 01/01/2005 et le 31/05/2011 dans les HĂŽpitaux d'Amiens, Caen, Lille, Rouen, Elbeuf et Évreux. Cette Ă©tude descriptive est basĂ©e sur l'analyse rĂ©trospective des dossiers d'hospitalisation et de suivi Ă  6 mois et plus. RĂ©sultats : cinquante-sept patients ont Ă©tĂ© inclus. Trente-neuf patients (68,4%) ont prĂ©sentĂ© des douleurs Ă  la phase aiguĂ«. Nous avons trouvĂ© que le sexe fĂ©minin (p=0.05), une atteinte cervicale (p=0.01) ou du cĂŽne terminal (p=0.04), un score ASIA cĂŽtĂ© B (p=0.04), un infarctus mĂ©dullaire d'origine aortique (p=4.19x 10-5), la prise d'un traitement antihypertenseur (p=0.04) ou d'une statine (p=0.05), une durĂ©e d'hospitalisation plus longue (p=0.003), une sortie vers un centre de convalescence (p= 0.0003), la prĂ©sence d'une sonde urinaire (p=0.001), la prise de laxatif (p=0.009) et l'usage d'un fauteuil roulant (p=0.0002) Ă©taient des facteurs associĂ©s Ă  la prĂ©sence de douleur Ă  la phase aiguĂ«. À ≄ 6 mois, 35 patients sur 51 survivants ont Ă©tĂ© revus en consultation de suivi. Vingt-cinq patients Ă©taient douloureux (71,4%). Un Ăąge moyen plus Ă©levĂ© (p=0.015), un score ASIA cĂŽtĂ© D (p=5.7x10-11), un infarctus mĂ©dullaire d'Ă©tiologie indĂ©terminĂ©e (p=0.04), la prise d'un traitement antihypertenseur (p=0.05) et la prĂ©sence d'une dysurie (p=0.03) Ă©taient des facteurs associĂ©s Ă  la prĂ©sence de douleur Ă  distance d'un infarctus mĂ©dullaire. Conclusion : La douleur est un symptĂŽme frĂ©quent aprĂšs un infarctus mĂ©dullaire Ă  la phase aiguĂ« mais Ă©galement Ă  distance. Elle nĂ©cessite un dĂ©pistage et une prise en charge spĂ©cifique afin d'ĂȘtre contrĂŽlĂ©e au plus vite

    Mouse models of Kcnq2 dysfunction

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    International audienceVariants in the Kv7.2 channel subunit encoded by the KCNQ2 gene cause epileptic disorders ranging from a benign form with self-limited epileptic seizures and normal development to severe forms with intractable epileptic seizures and encephalopathy. The biological mechanisms involved in these neurological diseases are still unclear. The disease remains intractable in patients affected by the severe form. Over the past 20 years, KCNQ2 models have been developed to elucidate pathological mechanisms and to identify new therapeutic targets. The diversity of Kcnq2 mouse models has proven invaluable to access neuronal networks and evaluate the associated cognitive deficits. This review summarizes the available models and their contribution to our current understanding of KCNQ2 epileptic disorders

    Représentations continue et discrÚte de la connectivité structurelle des fibres en U du sillon central

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    International audienceU-shape fibers are superficial white matter fibers connecting adjacent gyri. In this paper, we present a method to characterize the connectivity of U-shape fibers coursing around the central sulcus. Pre-and post-central gyral crests are semi-automatically drawn and used to build a connectivity space that is identical between subjects. This group space provides a dense representation of the short-range connectivity between the two gyri, as well as a structured representation after clustering

    Sulcal pits extraction: reliability and filtering parameter setting

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    Mapping Cortical Shape Differences Using a Searchlight Approach Based On Classification of Sulcal Pit Graphs

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    Accepted for publication at ISBI 2015, http://biomedicalimaging.org/2015/International audienceStudying cortical anatomy by examining the deepest part of cortical sulci, the sulcal pits, has recently raised a growing interest. In particular, constructing structural representations from patterns of pits has proved a promising approach. This study follows up in this direction and brings two main contri-butions. First, we introduce a graph kernel adapted to sulcal pit graphs, in order to perform classification of patterns of sul-cal pits using support vector machines directly in graph space. Second, we design a multivariate searchlight technique that enables the localization of informative patterns of sulcal pits. We demonstrate the relevance of our approach by studying cortical differences between male and female subjects using a large dataset of 134 subjects

    Benchmark data for sulcal pits extraction algorithms

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    This article contains data related to the research article “G. Auzias, L. Brun, C. Deruelle, O. Coulon, Deep sulcal landmarks: Algorithmic and conceptual improvements in the definition and extraction of sulcal pits, Neuroimage. 111 (2015) 12–25. doi:10.1016/j.neuroimage.2015.02.008”. This data can be used as a benchmark for quantitative evaluation of sulcal pits extraction algorithm. In particular, it allows a quantitative comparison with our method, and the assessment of the consistency of the sulcal pits extraction across two well-matched populations
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