Saccadic Movements
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Perseguição visual em ações interceptativas em situações de incerteza sobre a direção de deslocamento do alvo / Visual pursuit in interceptive actions in situations of uncertainty about direction of target displacement
O presente estudo teve como objetivo avaliar o efeito da incerteza a respeito da direção do deslocamento de um alvo na estratégia visual e controle motor em uma tarefa de interceptação. Participaram do Experimento I 17 voluntários, executando movimentos manuais interceptativos de um alvo virtual projetado em uma tela de LCD. A tarefa interceptativa foi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/03/2012
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2. Spinocerebellar ataxias: genotype-phenotype correlations in 104 Brazilian families
OBJECTIVE: Spinocerebellar ataxias are neurodegenerative disorders involving the cerebellum and its connections. There are more than 30 distinct subtypes, 16 of which are associated with an identified gene. The aim of the current study was to evaluate a large group of patients from 104 Brazilian families with spinocerebellar ataxias. METHODS: We studied 150
Clinics. Publicado em: 2012
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3. Movimentos oculares na leitura de palavras: modulação por estimulação transcraniana por corrente contínua
A estimulação transcraniana por corrente contínua (ETCC) é uma técnica capaz de modular a excitabilidade cortical de maneira segura, indolor e não-invasiva. Os efeitos de aumento ou diminuição da excitabilidade obtidos após a aplicação da ETCC dependem da polaridade utilizada (anódica ou catódica). Esta dissertação tem como objetivo investigar
Publicado em: 2009
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4. Slow saccadic eye movements in Wilson's disease
This is the first reported case of Wilson's disease where a global defect of saccadic eye movements has been documented by electro-oculography. The defect of rapid eye movements is discussed in relation to current anatomical, pathological, and experimental work relating to the descending frontobulbar saccadic eye movement system. It is suggested that the cau
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5. Topography of saccadic eye movements evoked by microstimulation in rabbit cerebellar vermis.
1. We investigated saccadic eye movements elicited by microstimulation in the vermis of the rabbit. Scleral search coils were implanted under the conjunctiva of both eyes and a recording chamber was placed over the cerebellar vermis. 2. Conjugate saccadic eye movements were evoked in lobules VIa, b and c and VII of the vermis by currents ranging from 4 to 60
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6. Saccadic dysmetria and "intact" smooth pursuit eye movements after bilateral deep cerebellar nuclei lesions.
Two patients with well defined lesions of midline cerebellar structures including the fastigial nuclei on both sides presented with saccadic hypermetria but well preserved smooth pursuit eye movements. This is a remarkable finding as the oculomotor vermis (lobules VI, VII) and the fastigial nucleus are known to play a part in the control of smooth pursuit ey
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7. Visual representations during saccadic eye movements
In normal vision, shifts of attention are usually followed by saccadic eye movements. Neurons in extrastriate area V4 are modulated by focal attention when eye movements are withheld, but they also respond in advance of visually guided saccadic eye movements. We have examined the visual selectivity of saccade-related responses of area V4 neurons in monkeys m
The National Academy of Sciences.
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8. Role of saccadic analysis in the diagnosis of multiple sclerosis in the era of magnetic resonance imaging.
Magnetic resonance imaging (MRI) has recently been recognised as the most sensitive method with which to detect clinically silent lesions in patients affected by multiple sclerosis. Visually guided horizontal saccadic eye movements (SEM) were studied, together with MRI, in 57 multiple sclerosis patients. A very similar sensitivity was found for both MRI (78.
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9. Correspondence of presaccadic activity in the monkey primary visual cortex with saccadic eye movements
We continuously scan the visual world via rapid or saccadic eye movements. Such eye movements are guided by visual information, and thus the oculomotor structures that determine when and where to look need visual information to control the eye movements. To know whether visual areas contain activity that may contribute to the control of eye movements, we rec
National Academy of Sciences.
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10. A pathophysiological approach to saccadic eye movements in neurological and psychiatric disease.
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11. Internuclear ophthalmoplegia. An electro-oculographic study of peak angular saccadic velocities.
Peak angular saccadic velocities were measured during 30 degrees saccades in 18 patients with internuclear ophthalmoplegia who had full or nearly full adduction range, and 25 normal subjects. The following observations were made: 1. In the normal group adduction velocities were significantly faster than abduction velocities and centring movements were faster
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12. Direction and Contrast Tuning of Macaque MSTd Neurons During Saccades
Saccades are rapid eye movements that change the direction of gaze, although the full-field image motion associated with these movements is rarely perceived. The attenuation of visual perception during saccades is referred to as saccadic suppression. The mechanisms that produce saccadic suppression are not well understood. We recorded from neurons in the dor
American Physiological Society.