Visual Evoked Potentials
Mostrando 1-12 de 149 artigos, teses e dissertações.
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1. Neuro-behavioral pattern of sleep bruxism in wakefulness
AbstractIntroduction: Sleep Bruxism (SB) is a non-functional rhythmic movement of the mandible with multifactorial aetiology and complex diagnose. It has been the subject of various studies over the past decades and it is considered a result of actions of the Central Nervous System modulated by Autonomous Nervous System. In this work, we test the hypothesis
Res. Biomed. Eng.. Publicado em: 15/02/2018
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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. Chromatic spatial contrast sensitivity estimated by visual evoked cortical potential and psychophysics
The purpose of the present study was to measure contrast sensitivity to equiluminant gratings using steady-state visual evoked cortical potential (ssVECP) and psychophysics. Six healthy volunteers were evaluated with ssVECPs and psychophysics. The visual stimuli were red-green or blue-yellow horizontal sinusoidal gratings, 5° × 5°, 34.3 cd/m2 mean luminan
Braz J Med Biol Res. Publicado em: 01/02/2013
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5. Effect of contrast and gaps between Vernier stimulus elements on sweep visual evoked potential measurements of human cortical Vernier responses
The present paper focuses on a classic hyperacuity, Vernier acuity-the ability to discriminate breaks in the collinearity of lines or edges on the order of only arcseconds of visual angle. We measured steady-state sweep visual evoked potentials (sVEPs) in response to 6 Hz periodic breaks in collinearity (Vernier offsets) in horizontal squarewave gratings. Ve
Psychol. Neurosci.. Publicado em: 2013
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6. Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways
The purpose of this study was to compare contrast sensitivity estimated from transient visual evoked potentials (VEPs) elicited by achromatic pattern-reversal and pattern-onset/offset modes. The stimuli were 2-cpd, achromatic horizontal gratings presented either as a 1 Hz pattern reversal or a 300 ms onset/700 ms offset stimulus. Contrast thresholds were est
Psychol. Neurosci.. Publicado em: 2013
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7. Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura / Not informed by the author
Esta pesquisa pretendia estabelecer um mapa espaço temporal das respostas de vernier no córtex visual humano. O uso do potencial visual provocado de varredura (PVPv) proporciona medidas eficientes e sensíveis dos limiares de vernier com os quais se pode começar a examinar as respostas corticais de vernier no âmbito dos parâmetros espaço temporais. As
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2012
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8. Avaliação eletrofisiológica e comportamental do processamento auditivo (central) e treinamento auditivo em indivíduos idosos / Electrophysiological and behavioral assessment of (central) auditory processing in elderly individuals
INTRODUÇÃO: O idoso freqüentemente apresenta alterações no Processamento Auditivo (Central), as quais contribuem para uma piora na qualidade de vida e afetam o relacionamento social destes indivíduos. O Treinamento Auditivo é uma prática amplamente utilizada na reabilitação de indivíduos com Transtorno de Processamento Auditivo (Central) e sua efe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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9. Comparison of the reliability of multifocal visual evoked cortical potentials generated by pattern reversal and pattern pulse stimulation
This study compared the effectiveness of the multifocal visual evoked cortical potentials (mfVEP) elicited by pattern pulse stimulation with that of pattern reversal in producing reliable responses (signal-to-noise ratio >1.359). Participants were 14 healthy subjects. Visual stimulation was obtained using a 60-sector dartboard display consisting of 6 concent
Braz J Med Biol Res. Publicado em: 2012-10
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10. Análise da relação entre parâmetros da onda-M e a dor
A dor é uma sensação subjetiva e individual que causa muitos desconfortos para quem a sente. Dessa forma, é necessário um método que se quantifique a dor objetivamente. Pesquisas mostram que os potenciais evocados geram respostas que podem refletir os processos dolorosos. Neste contexto, este estudo utilizou características da onda-M como possíveis m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2011
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11. Neuromotor development and visual acuity in premature infants submitted to early visuo-motor stimulation
To investigate the effects of early visual stimulation on the development of tonus and posture control and of grating visual acuity of preterm infants, eight infants received visual stimulation that induced head motion during the first 6 months of life in weekly sessions. Their performance was compared with that of unstimulated preterm infants of same age (n
Psychology & Neuroscience. Publicado em: 2008-06
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12. Investigação da possibilidade de correlação dos potenciais transcutâneos visuais evocados com o alcance do campo da vista humana / Inquiry about the possibility of correlation among the visual transcutâneos evoked visual potentials and the reach of the human visual field
Este trabalho descreve o desenvolvimento de um instrumento automático para medida de campo visual do olho humano, baseado na ocorrência de potenciais visuais evocados O principal objetivo do estudo foi demonstrar que os potenciais visuais evocados (P100) observados na região occipital podem ser correlacionados à visão de flashes de fontes luminosas pont
Publicado em: 2008