Flickering
Mostrando 1-12 de 56 artigos, teses e dissertações.
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1. Absorção, teatralidade e a tradição da pintura francesa na obra de Henri Matisse.
RESUMO O artigo examina as noções de “absorção” e “teatralidade” propostas por Michael Fried e retomadas por Yve-Alain Bois nos textos em que escreveu sobre a obra de Henri Matisse. Uma das questões centrais abordadas é o modo como a obra de Matisse resiste ao regime volátil de percepção precipitado pela modernidade industrial e como insta a
ARS (São Paulo). Publicado em: 05/09/2019
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2. Statistical evaluation of a novel SSVEP-BCI stimulation setup based on depth-of-field
Abstract Introduction The main drawback of a Brain-computer Interface based on Steady-State Visual Evoked Potential (SSVEP-BCI) that detects the emergence of visual evoked potentials (VEP) in reaction to flickering stimuli is its muscular dependence due to users must redirect their gaze to put the target stimulus in their field of view. In this work, a nove
Res. Biomed. Eng.. Publicado em: 30/10/2015
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3. Comparison of the influence of stimuli color on Steady-State Visual Evoked Potentials
IntroductionThe main idea of a traditional Steady State Visually Evoked Potentials (SSVEP)-BCI is the activation of commands through gaze control. For this purpose, the retina of the eye is excited by a stimulus at a certain frequency. Several studies have shown effects related to different kind of stimuli, frequencies, window lengths, techniques of feature
Res. Biomed. Eng.. Publicado em: 29/09/2015
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4. Uma análise espectroscópica de discos de acresção em variáveis cataclísmicas / A Spectroscopic Analysis of Accretion Disks in Cataclysmic Variables
An observational study of accretion disks in Cataclysmic Variables (CVs) is presented in this work. Time-resolved spectrophotometric data of the emission line profiles are analyzed. The line emissivity of the systems is mapped using the Doppler tomography technique. The basic orbital parameters of the systems, like the orbital period, mass, orbital inclinati
Publicado em: 2006
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5. Flickering fusion pores comparable with initial exocytotic pores occur in protein-free phospholipid bilayers
For the act of membrane fusion, there are two competing, mutually exclusive molecular models that differ in the structure of the initial pore, the pathway for ionic continuity between formerly separated volumes. Because biological “fusion pores” can be as small as ionic channels or gap junctions, one model posits a proteinaceous initial fusion pore. Beca
National Academy of Sciences.
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6. Effects of intracellular K+ and Rb+ on gating of embryonic rat telencephalon Ca(2+)-activated K+ channels.
We have investigated the effects of intracellular K+ and Rb+ on single-channel currents recorded from the large-conductance Ca(2+)-activated K+ (BK) channel of the embryonic rat telencephalon using the inside-out patch-clamp technique. Our novel observation concerns the effects of these ions on rapid flickering of channel openings. Specifically, flicker gati
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7. Two barium binding sites on a maxi K+ channel from human vas deferens epithelial cells.
Using the patch clamp technique, we have investigated the blockade of maxi-K+ channels present on vas deferens epithelial cells by extracellular Ba2+. With symmetrical 140 mM K+ solutions, Ba2+ produced discrete blocking events consisting of both long closings of seconds duration (slow block) and fast closings of milliseconds duration (flickering block). Kin
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8. Rapid fluctuations in transmitter release from single vesicles in bovine adrenal chromaffin cells.
Single-vesicle release of catecholamines from chromaffin cells can be detected in real time as current spikes by the electrochemical method of amperometry. About 70% of spikes are preceded by a small "foot," the trickle of transmitter out of the early fusion pore. In addition, 20-50% of foot signals exhibit rapid fluctuations that we interpret as flickering
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9. On the synchrony of steady state visual evoked potentials and oscillatory burst events
In this paper, we investigate the large-scale synchrony of EEG oscillatory bursts, during stimulation by a flickering square of light. Whereas most studies focus on averaged raw EEG responses, this study considers oscillatory events within EEG of single trials, which leads to various new insights. We recorded EEG signals before, during and after stimulation
Springer Netherlands.
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10. Optical images of visible and invisible percepts in the primary visual cortex of primates
We optically imaged a visual masking illusion in primary visual cortex (area V-1) of rhesus monkeys to ask whether activity in the early visual system more closely reflects the physical stimulus or the generated percept. Visual illusions can be a powerful way to address this question because they have the benefit of dissociating the stimulus from perception.
The National Academy of Sciences.
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11. Interocular comparison of contrast sensitivities in glaucoma patients and suspects.
Glaucoma affected the ability to detect low-contrast, flickering patterns ('DRC' measurement). DRC patterns were foveally viewed, of low spatial frequency, and flickering at 8 hertz. Interocular comparisons were performed in control subjects, in ocular hypertensives, and in glaucoma patients with asymmetric damage. Interocular differences in DRC tended to be
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12. Two distinct gating mechanisms in gap junction channels: CO2-sensitive and voltage-sensitive.
The chemical gating of single-gap junction channels was studied by the dual whole-cell voltage-clamp method in HeLa cells transfected with connexin43 (HeLa43) and in fibroblasts from sciatic nerves. Junctional current (Ij), single-channel conductance, and Ij kinetics were studied in cell pairs during CO2 uncoupling and recoupling at small transjunctional vol