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Search Results: 1 - 10 of 19319 matches for " Richard Delorme "
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Key visual features for rapid categorization of animals in natural scenes
Arnaud Delorme,Ghislaine Richard,Michele Fabre-Thorpe
Frontiers in Psychology , 2010, DOI: 10.3389/fpsyg.2010.00021
Abstract: In speeded categorization tasks, decisions could be based on diagnostic target features or they may need the activation of complete representations of the object. Depending on task requirements, the priming of feature detectors through top–down expectation might lower the threshold of selective units or speed up the rate of information accumulation. In the present paper, 40 subjects performed a rapid go/no-go animal/non-animal categorization task with 400 briefly flashed natural scenes to study how performance depends on physical scene characteristics, target configuration, and the presence or absence of diagnostic animal features. Performance was evaluated both in terms of accuracy and speed and d′ curves were plotted as a function of reaction time (RT). Such d′ curves give an estimation of the processing dynamics for studied features and characteristics over the entire subject population. Global image characteristics such as color and brightness do not critically influence categorization speed, although they slightly influence accuracy. Global critical factors include the presence of a canonical animal posture and animal/background size ratio suggesting the role of coarse global form. Performance was best for both accuracy and speed, when the animal was in a typical posture and when it occupied about 20–30% of the image. The presence of diagnostic animal features was another critical factor. Performance was significantly impaired both in accuracy (drop 3.3–7.5%) and speed (median RT increase 7–16 ms) when diagnostic animal parts (eyes, mouth, and limbs) were missing. Such animal features were shown to influence performance very early when only 15–25% of the response had been produced. In agreement with other experimental and modeling studies, our results support fast diagnostic recognition of animals based on key intermediate features and priming based on the subject’s expertise.
Exploratory analysis of obsessive compulsive symptom dimensions in children and adolescents: a Prospective follow-up study
Richard Delorme, Arnaud Bille, Catalina Betancur, Flavie Mathieu, Nadia Chabane, Marie Mouren-Simeoni, Marion Leboyer
BMC Psychiatry , 2006, DOI: 10.1186/1471-244x-6-1
Abstract: This study was designed to perform an exploratory factor analysis of OC symptoms in a sample of children and adolescents with OC disorder (OCD) and to investigate the course of factors over time (mean follow-up period: four years).We report for the first time that four symptom dimensions, remarkably similar to those previously described in adults, underlined the heterogeneity of OC symptoms in children and adolescents. Moreover, after follow-up, the symptom dimensions identified remained essentially unmodified. The changes observed concerned the intensity of dimensions rather than shifts from one dimension to another.These findings reinforce the hypothesis of a phenotypic continuum of OC symptoms from childhood to adulthood. They also strengthen the interest for investigating the clinical, neurobiological and genetic heterogeneity of OCD using a dimension-based approach.Obsessive-compulsive disorder (OCD) is a severe, chronic neuropsychiatric illness affecting 1%–3% of children and adolescents, characterized by recurrent, distressing, unwanted thoughts (obsessions) and repetitive, ritualistic behaviors (compulsions). Although standard nomenclatures regard OCD as a unitary nosological entity, patients typically display a wide variety of obsessions and/or compulsions of varying severity. The diversity of demographic and clinical characteristics [1,2], nature of OCD symptoms (predominance of obsessions or compulsions), associated comorbid disorders [3], and response to treatment interventions [4], suggests that important subtypes of OCD may exist. However, earlier attempts for symptom-based taxonomies have met limited success. Indeed, the categorical studies that used mutually exclusive subgroups of patients (e.g., checkers versus washers) to determine a specific relationship with clinical variables such as psychopathology, response to treatment, or genetic and neurobiologic variables were relatively uninformative, and follow-up studies reported important changes in th
Faculté des sciences de Bordeaux, René-André Coulon architecte
Franck Delorme
In Situ : Revue de Patrimoines , 2012, DOI: 10.4000/insitu.932
Abstract: Au sortir de la seconde guerre mondiale, les facultés bordelaises étouffent dans leurs locaux du centre-ville édifiés sous la troisième République. Un ambitieux programme de transferts des établissements universitaires vers les banlieues de Pessac, Talence et Gradignan se met en place à partir des années 1950. L’architecte René-André Coulon (1908-1997) con oit la faculté des sciences de Bordeaux, envisagée alors comme une véritable faculté pour l’an 2000 . Tout en disposant largement les différents batiments dans l’espace du campus, Coulon s’attache à leur donner un style original, tout empreint de rigueur et de rationalisme, mais qui montre également quelques écarts notables avec les normes régissant alors les constructions universitaires. Talence est la première réalisation universitaire de Coulon, qui travaillera par la suite sur des programmes fort différents, qu’il s’agisse du campus de HEC à Jouy-en-Josas ou de celui de la faculté des sciences de Paris-centre avec édouard Albert.
Explication du sens en classe de langue : le r le du contexte
Delorme Vera
SHS Web of Conferences , 2012, DOI: 10.1051/shsconf/20120100319
Abstract: Cette communication propose de mettre en lumière les pratiques par lesquelles s'effectue l'explication du sens par le contexte dans les interactions verbales en classe de langue (fran ais langue étrangère). Les pratiques en question – qui sont à la fois discursives et didactiques – consistent à construire un contexte fictionnel ou réel autour d’un élément à transmettre, pouvant être un mot, une expression ou encore un acte langagier, dans le but d’illustrer le sens de ce dernier. A travers l’analyse des transcriptions des interactions en classe de FLE (public adulte) on mettra en évidence la diversité des moyens discursifs que les participants à l’interaction didactique utilisent dans la construction des contextes et on proposera la description du fonctionnement de ces derniers que l’on développera d'une part en nous appuyant sur la conceptualisation du contexte en linguistique interactionnelle, et d'autre part à partir de la notion du cadre de l’expérience (Goffman). Concernant ce dernier point, on insistera sur le fait que les prémisses organisationnelles des cadres jouent un r le crucial dans la transmission des connaissances à travers la construction discursive des contextes car, d’une part, ils représentent les mécanismes qui permettent d’interpréter une situation construite et de ce fait, d’accéder au sens d’un élément à transmettre, et d’autre part, ces schèmes interprétatifs peuvent eux-mêmes faire partie du contenu à enseigner/apprendre. En outre, on soulignera que, dans la mesure où les cadres s’inscrivent dans la culture d’un groupe social donné, les contextes construits dans le discours véhiculent inévitablement une part de culturel.
Harmonic analysis on real reductive symmetric spaces
Patrick Delorme
Mathematics , 2003,
Abstract: Let $G$ be a reductive group in the Harish-Chandra class e.g. a connected semisimple Lie group with finite center, or the group of real points of a connected reductive algebraic group defined over $\R$. Let $\sigma$ be an involution of the Lie group $G$, $H$ an open subgroup of the subgroup of fixed points of $\sigma$. One decomposes the elements of $L^2(G/H)$ with the help of joint eigenfunctions under the algebra of left invariant differential operators under $G$ on $G/H$.
Neighborhoods at infinity and the Plancherel formula for a reductive $p$-adic symmetric space
Patrick Delorme
Mathematics , 2014,
Abstract: Yiannis Sakellaridis and Akshay Venkathesh have determined, when the group $G$ is split and the field $\F$ is of characteristic zero, the Plancherel formula for any spherical space $X$ for $G$ modulo the knowledge of the discrete spectrum. The starting point is the determination of good neighborhoods at infinity of $X/J$, where $J$ is a small compact open subgroup of $G$. These neighborhoods are related to "boundary degenerations" of $X$. The proof of their existence is made by using wonderful compactifications. In this article we will show the existence of such neighborhoods assuming that $\F$ is of characteristic different from 2 and $X$ is symmetric. In particular, one does not assume that $G$ is split. Our main tools are the Cartan decomposition of Benoist and Oh, our previous definition of the constant term and asymptotic properties of Eisenstein integrals due to Nathalie Lagier . Once the existence of these neighborhoods at infinity of $X$ is established, the analog of the work of Sakellaridis and Venkatesh is straightforward and leads to the Plancherel formula for $X$.
Classification des triples de Manin pour les algèbres de Lie réductives complexes
Patrick Delorme
Mathematics , 2000,
Abstract: We study real and complex Manin triples for a complex reductive Lie algebra, $\g$. The first part includes, and extends to complex Manin triples, our earlier work [De]. First, we generalize results of E. Karolinsky, on the classification of Lagrangian subalgebras (cf.[K1], [K3]). Then we show that, if $\g$ is non commutative, one can attach, to each Manin triple in $\g$, another one for a strictly smaller reductive complex Lie subalgebra of $\g$. This gives a powerful tool for induction. Then we classify complex Manin triples, in terms of what we call generalized Belavin-Drinfeld data. In particular this generalizes, by other methods, the classification of A. Belavin and G. Drinfeld of certain $R$-matrices, i.e. the solutions of modified triangle equations for constants (cf [BD], Theorem 6.1). We get also results for real Manin triples. In passing, one retrieves a result of A. Panov [P1] which classifies certain Lie bialgebras structures on a real simple Lie algebra.
Sur les triples de Manin pour les algèbres de Lie réductives complexes
P. Delorme
Mathematics , 1999,
Abstract: We study Manin triples for a reductive Lie algebra, $\g$. First, we generalize results of E. Karolinsky, on the classification of Lagrangian subalgebras (cf. KAROLINSKY E., {\em A Classification of Poisson homogeneous spaces of a compact Poisson Lie group}, Dokl. Ak. Nauk, 359 (1998), 13-15). Then we show that, if $\g$ is non commutative, one can attach, to each Manin triple in $\g$, an other one for a strictly smaller reductive complex Lie subalgebra of $\g$. We study also the inverse process.
Théorème de Paley-Wiener pour les fonctions de Whittaker sur un groupe réductif p-adique
Patrick Delorme
Mathematics , 2009,
Abstract: We define the Fourier transform of compactly supported Whittaker functions on a reductive p-adic group and we characterize the image of this transformation.
Formule de Plancherel pour les fonctions de Whittaker sur un groupe réductif $p$-adique
Patrick Delorme
Mathematics , 2010,
Abstract: We prove the Plancherel formula for Whittaker functions on a reductive p-adic group. This a sequel to our work on Paley-Wiener theorem. Our proof is close to the proof written by Waldspurger of the Harish-Chandra Plancherel formula for smooth functions on the group and use many of his results. One simplification is the easy proof of the Fourier transfom, which follows from a result of Joseph Bernstein.
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