Primary Visual Cortex
Mostrando 1-12 de 160 artigos, teses e dissertações.
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1. Alice in Wonderland syndrome: “Who in the world am I?”
RESUMO Síndrome de Alice no País das Maravilhas (SAPM) é uma condição paroxística visual perceptiva e somestésica que pode ser encontrada em pacientes com enxaqueca, epilepsia, doença cerebrovascular ou infecções. A condição é relativamente rara e tem características alucinatórias peculiares. Objetivo: Discutir as potenciais vias envolvidas n
Arq. Neuro-Psiquiatr.. Publicado em: 23/09/2019
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2. New evidence of visual space anisotropy with auto-stereograms
Numerous research efforts have been directed toward determining the origin of anisotropies of visual space, in contrast to real space. Recent neurophysiological studies have placed the origin in the primary visual cortex (V1) or beyond. The present study sought to provide new psychophysical evidence of the origin of these anisotropies using auto-stereograms
Psychol. Neurosci.. Publicado em: 2014-12
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3. Early malnutrition decreases contrast sensitivity to circular concentric gratings
Early malnutrition refers to inadequate nutrition during the critical period of nervous system development followed by nutritional recovery, resulting in a short stature according to age but normal weight according to short stature. We measured the effects of early malnutrition on contrast sensitivity (CS) to concentric circular gratings in 18 children of bo
Psychol. Neurosci.. Publicado em: 2012-06
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4. Modulação centro-contorno em campos receptivos do wulst visual
Neurons in the primary visual cortex (V1) typically show response suppression when stimulated by oriented stimuli larger than their classical receptive fields (CRF). Here, we investigate the prevalence, strength and feature selectivity of center-surround modulation in the owl visual wulst, an area that presents close hodological and physiological similaritie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/10/2011
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5. Cortical representation of the horizon in V1 and peripheral scaling in mammals with lateral eyes
In the present investigation we mapped the primary visual area of the South American diurnal rodent, Dasyprocta aguti, by standardized electrophysiological mapping techniques. In particular, we performed a series of mapping experiments of the visual streak in the primary visual cortex. We found that the representation of the visual streak in V1 is greatly ex
Psychology & Neuroscience. Publicado em: 2011-06
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6. Investigaçăo sobre o impacto da estimulaçăo transcraniana por corrente contínua em tarefa de resoluçăo temporal por meio da prova RGDT - Random Gap Detection Test
The Central Auditory Processing Disorders are the deficiency of one or more hearing processes and mechanisms or the deficiency of major dysfunctions. Considering that new therapeutic and/or diagnostic approaches should be investigated, recent studies have shown that non invasive cerebral stimulation tools are efficient in the modulation of brain activity in
Publicado em: 2009
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7. Division of labor between M and P visual pathways: different visual pathways minimize joint entropy differently
Visual perception and action are strongly linked with parallel processing channels connecting the retina, the lateral geniculate nucleus, and the input layers of the primary visual cortex. Achromatic vision is provided by at least two of such channels formed by the M and P neurons. These cell pathways are similarly organized in primates having different life
Psychology & Neuroscience. Publicado em: 2008-06
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8. Análises de estabilidade e de sensibilidade de modelos biologicamente plausíveis do córtex visual primário / Stability and Sensitivity analysis of biologically plausible models of primary visual cortex neurons
A neurociência computacional é uma vasta área que tem como objeto de estudo o entendimento ou a emulação da dinâmica cerebral em diversos níveis. Neste trabalho atenta-se ao estudo da dinâmica de neurônios, os quais, no consenso atual, acredita-se serem as unidades fundamentais do processamento cerebral. A importância do estudo sobre o comportament
Publicado em: 2008
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9. Campos receptivos similares às wavelets de Haar são gerados a partir da codificação eficiente de imagens urbanas;V1 / Receptive fields similar to those of wavelets are generated by Haar from the consolidation of efficient urban images
A codificação eficiente de imagens naturais gera filtros similares às wavelets de Gabor que relembram os campos receptivos de células simples do córtex visual primário. No entanto, imagens naturais e urbanas tem características estatísticas diferentes. Será mostrado que uma simples análise do espectro de potência em um modelo eficiente sugere que
Publicado em: 2008
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10. Transcranial direct current stimulation associated to multidisciplinary treatment for fibromyalgia: a double-blinded, randomized controlled trial / Estimulação transcraniana com corrente contínua associada ao tratamento multidisciplinar da fibromialgia: um estudo duplo-cego, aleatorizado e controlado
Transcranial direct current stimulation (tDCS) is a non-invasive technique of cortical brain stimulation which has shown some positive effects on chronic pain control. The main hypothesis of this study was to verify if the association of tDCS to the multidisciplinary approach in patients with fibromyalgia would increase the results for the control of pain an
Publicado em: 2008
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11. Modelação de fenômenos de plasticidade rápida no sistema visual de mamíferos / Modeling Fast Plasticity Phenomena in the Mammalian Primary Visual Cortex
Neurônios do córtex visual primário (V1) são seletivos à orientação, direção e freqüência espacial de estímulos apresentados em seus campos receptivos. Os últimos 40 anos acumularam uma quantidade considerável de teorias e dados sobre o processamento cortical de seletividade. Apesar disso, um consenso sobre os mecanismos que geram preferência
Publicado em: 2006
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12. Stereotactic radiosurgery in the treatment of brain metastases: efficacy and complications based on brain location / Radiocirurgia no tratamento das metástases cerebrais: resposta terapêutica e complicações baseadas na localização da lesão
Brain metastases are the most common Central Nervous System tumors. Among the therapy options stereotactic radiosurgery has became in the last two decades an usefulness treatment technique attending with lower complication and mortality rate. However, even an extended literature review, many questions remain unclear about this therapy modality, mainly relate
Publicado em: 2006