Receptive Fields
Mostrando 1-12 de 209 artigos, teses e dissertações.
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1. Neurophysiological correlates of color vision: a model
The tree-receptor theory of human color vision accounts for color matching. A bottom-up, non-linear model combining cone signals in six types of cone-opponent cells in the lateral geniculate nucleus (LGN) of primates describes the phenomenological dimensions hue, color strength, and lightness/brightness. Hue shifts with light intensity (the Bezold-Brücke ph
Psychol. Neurosci.. Publicado em: 2013
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2. 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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3. SegmentaÃÃo e classificaÃÃo de padrÃes visuais baseadas em campos receptivos e inibitÃrios
The human visual system is one of the most fascinating mechanisms from nature. It is through the visual system that humans are able to accomplish their most basic tasks, like watching TV, until the most complexes ones, like making microscopic analysis in laboratories. Then, two models based on the behavior of the human visual system are proposed in this work
Publicado em: 2009
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4. Diferenças de gênero relacionadas ao estilo de vida, estado de saúde e utilização dos serviços de saúde: um inquérito de base populacional
The issue of gender concerning health has an important role in the sickness process once it is connected with the culture that affects both sexes, with the resources that they utilize in order to face the damages to health and with the social context they belong to. It is known that the feminine gender lives longer; however, it refers more health and psychol
Publicado em: 2009
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5. 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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6. Uma modelagem matemático-computacional do sistema biológico de percepção de movimento e velocidade
Everything that we see is mentally built by the human brains visual system, from the stimuli received by the retinas: the perception of color, shape, depth and motion, the objects and the complete visual scenes. Researches on artificial intelligence, especially applied to robotics, look for emulating this biological function, in order to enable artificial sy
Publicado em: 2006
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7. Topography and nociceptive receptive fields of climbing fibres projecting to the cerebellar anterior lobe in the cat.
1. The cutaneous receptive fields of 225 climbing fibres projecting to the forelimb area of the C3 zone in the cerebellar anterior lobe were mapped in the pentobarbitone-anaesthetized cat. Responses in climbing fibres were recorded as complex spikes in Purkinje cells. 2. A detailed topographical organization of the nociceptive climbing fibre input to the C3
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8. Two-dimensional modeling of visual receptive fields using Gaussian subunits.
Retinal ganglion cell receptive fields have been successfully described using the difference of Gaussians model introduced by Rodieck. As the basic elements of retinal receptive fields are well described by the Gaussian function, it is natural to model receptive fields beyond this level as a convergence of Gaussian subunits. In this paper the full two-dimens
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9. Functional classification of afferent phrenic nerve fibres and diaphragmatic receptors in cats.
1. Single afferent fibres with receptive fields in the diaphragm (272 units) dissected from the right phrenic nerve were classified according to the following properties: reaction to contraction of the diaphragm, resting activity, conduction velocity, location and properties of receptive fields, and reaction to injection of bradykinin and lactic acid into th
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10. Altered somatosensory receptive fields in hamster colliculus after infraorbital nerve section and xylocaine injection.
The effects of acute infraorbital (i.o.) nerve section upon the responses of somatosensory cells in the rostral part of the deep layers of the hamster's superior colliculus were studied using standard extracellular single-unit recording and receptive field mapping techniques. In nine animals a given cell's receptive field was determined both before and after
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11. Receptive fields and in-field afferent inhibition of neurones in the cat's lateral cervical nucleus.
1. Extracellular microelectrode recordings were made from projection neurones of the lateral cervical nucleus (LCN) in cats anaesthetized with chloralose and paralysed with gallamine triethiodide. 2. The receptive fields of eight-five units were analysed. Most units had excitatory receptive fields similar in size and shape to those of spinocervical tract (SC
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12. Receptive field profiles and integrative properties of spinocervical tract cells in the cat.
The receptive fields of sixteen spinocervical tract (s.c.t.) cells whose responses were recorded extracellularly were mapped using discrete and uniform jets of air given at equally spaced locations on the clipped fur of cats anaesthetized with chloralose. All the cells whose receptive fields were on the thigh or upper hind limb showed approximately unimodal