880 resultados para Visão binocular


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The Brazilian market in the XIX century: an approach through the cabotage commerce. The maritime commerce consisted of the main way of circulation of the goods between the Brazilian provinces until the second half of century XIX. Although the relatively big importance of the flows of commerce with the exterior, we note significant exchange of goods by sea between the Brazilian regions since the colonial period. A part of these exchanges derived from products destined in last instance to the foreigner or imported of the exterior. However, another part elapsed of national goods that had not arrived at be exported to the international market. Many goods for the colonial and imperial consumption had circulated by the Brazilian coasts in expressive sums. From the information raised for the imperial period, especially the decades of 1860 and 1870, we verify that most of the goods commercialized between the provinces consisted of national products destined to the internal consumption.

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Os Núcleos de Apoio à Saúde da Família (NASF) foram criados para ampliar a resolutividade da atenção primária. A iminência da implantação na região oeste do Município de São Paulo, Brasil, motivou a realização de oficinas para elaborar uma proposta de NASF por profissionais da atenção primária à saúde. Utilizamos a análise hermenêutica para estudar o material transcrito. As categorias temáticas foram: papel, constituição, funcionamento, relação com a equipes de saúde da família e interdisciplinaridade. A expectativa dos participantes foi de que o NASF seja um dispositivo potencializador da integralidade do cuidado, intervindo na cultura dos encaminhamentos desnecessários e na articulação com os outros níveis de atenção; além de contribuir para a discussão da formação dos profissionais e de estimular a reflexão junto aos gestores sobre indicadores de saúde vinculados exclusivamente ao número de atendimentos, que não refletem o impacto das ações desenvolvidas nem a qualidade do cuidado oferecido à população adscrita.

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Muitas pesquisas estão sendo desenvolvidas buscando nos sistemas inteligentes soluções para diagnosticar falhas em máquinas elétricas. Estas falhas envolvem desde problemas elétricos, como curto-circuito numa das fases do estator, ate problemas mecânicos, como danos nos rolamentos. Dentre os sistemas inteligentes aplicados nesta área, destacam-se as redes neurais artificiais, os sistemas fuzzy, os algoritmos genéticos e os sistemas híbridos, como o neuro-fuzzy. Assim, o objetivo deste artigo é traçar um panorama geral sobre os trabalhos mais relevantes que se beneficiaram dos sistemas inteligentes nas diferentes etapas de análise e diagnóstico de falhas em motores elétricos, cuja principal contribuição está em disponibilizar diversos aspectos técnicos a fim de direcionar futuros trabalhos nesta área de aplicação.

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A tutoria, na modalidade mentoring, tem sido adotada nas escolas médicas como estratégia para oferecer suporte pessoal e estimular o desenvolvimento profissional do futuro médico. O tutor, com papel de mentor, elemento crucial desta relação arquetípica, é pouco estudado em seu desenvolvimento pessoal. Este estudo buscou compreender as motivações de um grupo de tutores e identificar as possíveis transformações ocorridas ao longo do tempo. A investigação consistiu em um estudo qualitativo em que foram entrevistados 14 tutores de um Programa de Tutoria de uma Faculdade de Medicina. Há, entre os tutores, um desejo de restabelecer a antiga, significativa e próxima relação do mestre com o seu discípulo. Simbolicamente, buscam estar em contato com o seu "aluno interno ferido", e dele cuidar. Nessa jornada, podem - mas não necessariamente isso acontece a todos - transformar e ser transformados pelo outro.

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Vídeo grabado en El Viso, Córdoba

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In binocular rivalry, presentation of different images to the separate eyes leads to conscious perception alternating between the two possible interpretations every few seconds. During perceptual transitions, a stimulus emerging into dominance can spread in a wave-like manner across the visual field. These traveling waves of rivalry dominance have been successfully related to the cortical magnification properties and functional activity of early visual areas, including the primary visual cortex (V1). Curiously however, these traveling waves undergo a delay when passing from one hemifield to another. In the current study, we used diffusion tensor imaging (DTI) to investigate whether the strength of interhemispheric connections between the left and right visual cortex might be related to the delay of traveling waves across hemifields. We measured the delay in traveling wave times (ΔTWT) in 19 participants and repeated this test 6 weeks later to evaluate the reliability of our behavioral measures. We found large interindividual variability but also good test-retest reliability for individual measures of ΔTWT. Using DTI in connection with fiber tractography, we identified parts of the corpus callosum connecting functionally defined visual areas V1-V3. We found that individual differences in ΔTWT was reliably predicted by the diffusion properties of transcallosal fibers connecting left and right V1, but observed no such effect for neighboring transcallosal visual fibers connecting V2 and V3. Our results demonstrate that the anatomical characteristics of topographically specific transcallosal connections predict the individual delay of interhemispheric traveling waves, providing further evidence that V1 is an important site for neural processes underlying binocular rivalry.

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Tracking user’s visual attention is a fundamental aspect in novel human-computer interaction paradigms found in Virtual Reality. For example, multimodal interfaces or dialogue-based communications with virtual and real agents greatly benefit from the analysis of the user’s visual attention as a vital source for deictic references or turn-taking signals. Current approaches to determine visual attention rely primarily on monocular eye trackers. Hence they are restricted to the interpretation of two-dimensional fixations relative to a defined area of projection. The study presented in this article compares precision, accuracy and application performance of two binocular eye tracking devices. Two algorithms are compared which derive depth information as required for visual attention-based 3D interfaces. This information is further applied to an improved VR selection task in which a binocular eye tracker and an adaptive neural network algorithm is used during the disambiguation of partly occluded objects.

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Ocular dominance (OD) plasticity is a robust paradigm for examining the functional consequences of synaptic plasticity. Previous experimental and theoretical results have shown that OD plasticity can be accounted for by known synaptic plasticity mechanisms, using the assumption that deprivation by lid suture eliminates spatial structure in the deprived channel. Here we show that in the mouse, recovery from monocular lid suture can be obtained by subsequent binocular lid suture but not by dark rearing. This poses a significant challenge to previous theoretical results. We therefore performed simulations with a natural input environment appropriate for mouse visual cortex. In contrast to previous work, we assume that lid suture causes degradation but not elimination of spatial structure, whereas dark rearing produces elimination of spatial structure. We present experimental evidence that supports this assumption, measuring responses through sutured lids in the mouse. The change in assumptions about the input environment is sufficient to account for new experimental observations, while still accounting for previous experimental results.

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This article aims to identify how the Foodstuff Acquisition Program has influenced market creation for family farmers in two Brazilian states - Minas Gerais e Bahia and also the limitations and benefits of the program from the point of view of the extension agents. A bibliographic research and a quantitative exploratory study were conducted, questionnaires were sent to extension agents who work for public rural extension agencies, municipalities, NGOs, cooperatives and producers' associations, during the year 2010-2011.

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This article aims to identify how the Foodstuff Acquisition Program has influenced market creation for family farmers in two Brazilian states - Minas Gerais e Bahia and also the limitations and benefits of the program from the point of view of the extension agents. A bibliographic research and a quantitative exploratory study were conducted, questionnaires were sent to extension agents who work for public rural extension agencies, municipalities, NGOs, cooperatives and producers' associations, during the year 2010-2011.

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This article aims to identify how the Foodstuff Acquisition Program has influenced market creation for family farmers in two Brazilian states - Minas Gerais e Bahia and also the limitations and benefits of the program from the point of view of the extension agents. A bibliographic research and a quantitative exploratory study were conducted, questionnaires were sent to extension agents who work for public rural extension agencies, municipalities, NGOs, cooperatives and producers' associations, during the year 2010-2011.

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