A new "tilt" illusion reveals the relation between border ownership and border binding

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The role of crowding in contextual influences on contour integration

Dakin and Baruch (2009) investigated how context influences contour integration, specifically reporting that near-perpendicular surrounding-elements reduced the exposure-duration observers required to localize and determine the shape of contours (compared to performance with randomly oriented surrounds) while near-parallel surrounds increased this time. Here, we ask if this effect might be a manifestation of visual crowding (the disruptive influence of "visual clutter" on object recognition). We first report that the effect generalizes to simple contour-localization (without explicit shape-discrimination) and influences tolerance to orientation jitter in the same way it affects threshold exposure-duration. We next directly examined the role of crowding by quantifying observers' local uncertainty (about the orientation of the elements that comprised our contours), showing that this largely accounts for the effects of context on global contour integration. These findings support the idea that context influences contour integration at a predominantly local stage of processing and that the local effects of crowding eventually influence downstream stages in the cortical processing of visual form

The antenna DSA 3 and its potential use for Radio Astronomy

The European Space Agency (ESA) will inaugurate its third Deep Space Antenna (DSA 3) by the end of 2012. DSA 3 will be located in Argentina near the city of Malarg"ue in the Mendoza province. While the instrument will be primarily dedicated to communications with interplanetary missions, the characteristics of its antenna and receivers will also enable standalone leading scientific contributions, with a high scientific-technological return. We outline here scientific proposals for a radio astronomical use of DSA 3.Comment: 4 pages, submitted as Proceedings for the BAA

Serpentinites and serpentinites within a fossil subduction channel : La Corea mélange, eastern Cuba

A variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. The mélange originated during the Cretaceous as part of the subduction channel associated with the Caribbean island arc. This mélange contains high pressure blocks in a serpentinite matrix and occurs at the base of the large tabular Mayarí-Cristal ophiolite. Two principal groups of serpentinites have been identified in the mélange: a) antigorite serpentinite, mainly composed of antigorite and b) antigorite-lizardite serpentinite, composed of mixtures of antigorite and lizardite and bearing distinctive porphyroblasts of diopsidic clinopyroxene. Antigorite serpentinites are closely related to tectonic blocks of amphibolite (representing subducted MORB) and constitute deep fragments of the serpentinitic subduction channel formed during hydration of the mantle wedge. The composition of the antigorite-lizardite serpentinites and the presence of clinopyroxene porphyroblasts in this type of rock suggest that abyssal lherzolite protoliths transformed into serpentinite before and during incorporation (as tectonic blocks) in the shallow part of the subduction channel. Although the studied rocks have different origin, mineralogical compositions and textures, they display similar PGE compositions, suggesting that these elements experienced no significant redistribution during metamorphism. Both types of serpentinites were exposed together in the La Corea mélange during the Late Cretaceous, during obduction of the overriding Mayarí-Baracoa ophiolitic belt that led to exhumation of the subduction channel (mélange)

The role of crowding in contextual influences on contour integration

Dakin and Baruch (2009) investigated how context influences contour integration, specifically reporting that nearperpendicular surrounding-elements reduced the exposure-duration observers required to localize and determine the shape of contours (compared to performance with randomly oriented surrounds) while near-parallel surrounds increased this time. Here, we ask if this effect might be a manifestation of visual crowding (the disruptive influence of ''visual clutter'' on object recognition). We first report that the effect generalizes to simple contour-localization (without explicit shape-discrimination) and influences tolerance to orientation jitter in the same way it affects threshold exposure-duration. We next directly examined the role of crowding by quantifying observers' local uncertainty (about the orientation of the elements that comprised our contours), showing that this largely accounts for the effects of context on global contour integration. These findings support the idea that context influences contour integration at a predominantly local stage of processing and that the local effects of crowding eventually influence downstream stages in the cortical processing of visual form

El tratamiento de la evidencia digital y las normas ISO/IEC 27037:2012

La evidencia digital bien procesada puede aprovecharse al máximo en distintos escenarios. En cada uno de ellos existe una orientación diferente respecto de lo que se pretende obtener: calidad probatoria, precisión en el análisis, restauración del servicio y/o el costo de la recolección de la evidencia. Los componentes clave que proporcionan credibilidad en la investigación son la metodología aplicada durante el proceso y la calificación de los individuos que intervienen en el desarrollo de las tareas especificadas en la metodología. Este trabajo presenta pautas para el manejo de la evidencia digital; sistematizando la identificación, adquisición, análisis y preservación de la misma. Estos procesos están diseñados para mantener la integridad de la evidencia, con una metodología aceptable para contribuir a su admisibilidad en procesos legales y en sintonía con las normas ISO/IEC 27037:2012. En concordancia con la ley provincial 13139 (que tiene por objeto migrar el software propietario que utiliza la provincia de Santa Fe hacia software libre), un objetivo adicional del proyecto es no solo generar nuevas herramientas y protocolos de análisis digital forense sino también evaluar aquellos ya existentes. Finalmente, se muestran los resultados de un exhaustivo benchmarking, análisis y valoración de algunas herramientas GNU disponibles.Eje: Seguridad InformáticaRed de Universidades con Carreras en Informática (RedUNCI

Neuroprosthetic device for functional training, compensation or rehabilitation of lower limbs during gait

In this work, the novel and flexible H-GAIT NP for lower limbs training and compensation is presented. This NP is able to detect four subphases of gait cycle and provide configurable surface stimulation patterns at each subphase. The H-GAIT NP can stimulate 4 independent channels for each subphase, allowing to reproduce diverse muscle activation patterns that can be needed in different rehabilitation scenarios.CONACYT – Consejo Nacional de Ciencia y TecnologíaPROCIENCI