Cerebral Spikes
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Uroguanilina induz potenciais em espiga no eletroencefalograma de ratos
A uroguanilina (UGN) é um peptídeo endógeno que age em receptores do tipo guanilato ciclase de membrana de células intestinais e renais aumentando a produção de GMPc e regulando o transporte epitelial de eletrólitos e água. Pesquisas recentes demonstraram a expressão deste peptídeo e de seus receptores no sistema nervosa central. O presente trabalh
Braz. J. Biol.. Publicado em: 2013-08
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2. Endovascular electroencephalography: the technique and its application during carotid amytal assessment.
The EEG was recorded using an endovascular guide wire as the electrode. This was Teflon coated except for its terminal portion, which was placed distal to the origin of the middle cerebral artery. Four hemispheres were sampled sequentially in two patients with intractable complex partial seizures who were undergoing routine preoperative carotid amytal assess
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3. Neurophysiological identification of a late infantile form of `neuronal lipidosis'
In the past, the classification of progressive neurological diseases in childhood has been based on either clinical or histological criteria. More recently biochemical aspects have been included and the resulting terminology has become very complex. As the electrical activity of the brain is a sensitive indicator of altered cerebral metabolism, the EEG has a
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4. An electrophysiological study of the in vitro, perfused brain stem-cerebellum of adult guinea-pig.
1. We describe here a technique which allows the long-term in vitro survival of the perfused isolated brain stem-cerebellum of adult guinea-pig. The viability of this preparation was assessed by comparing the electrophysiological properties of individual neurones and of neuronal pools to those obtained in vivo or in brain slices. The areas investigated inclu
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5. An excitatory pathway through dorsal columns to rubrospinal cells in the cat.
A somaesthetic excitatory pathway to rubrospinal cells, via other than cortico- or cerebello-rubral relays, has been demonstrated in cats, using intracellular recording techniques. After lesions of the rostral part of the cerebral cortex and the cerebellum, electrical stimulation of the contralateral forepaw and low intensity stimulation of the dorsal column
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6. Dissociation of spikes, synaptic activity, and activity-dependent increments in rat cerebellar blood flow by tonic synaptic inhibition
Functional neuroimaging relies on the robust coupling between neuronal activity, metabolism and cerebral blood flow (CBF) to map the brain, but the physiological basis of the neuroimaging signals is still not well understood. Here we applied a pharmacological approach to separate spiking activity, synaptic activity, and the accompanying changes in CBF in rat
National Academy of Sciences.
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7. So-called neuronal ceroid lipofuscinosis: Neurophysiological studies in 60 children
EEG, ERG, and VEP studies were carried out in 60 children with verified neuronal storage of ceroid/lipofuscin-like material. Comparing and contrasting the EEG/ERG/VER features of each child during the symptomatic phase of the disease, three distinct main groups could be recognised: (1) Progressive diminution in amplitude of the EEG and VEP beginning about th
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8. Hemodynamic Surrogates for Excitatory Membrane Potential Change During Interictal Epileptiform Events in Rat Neocortex
Hemodynamic changes in the brain are often used as surrogates for epileptic neuronal activity in both the laboratory and the clinic (e.g., intrinsic signal, functional magnetic resonance imaging and single-photon emission computed tomography) in spite of the fact that perfusion-based signals have been shown to overestimate the population of spiking neurons.
American Physiological Society.
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9. A magnesium-sensitive post-synaptic potential in rat cerebral cortex resembles neuronal responses to N-methylaspartate.
In isolated slices of rat cerebral cortex, intracellular recordings were obtained from pyramidal cells that were predominantly in layers II/III. These cells could be antidromically activated from the underlying white matter and had resting potentials of greater than -75 mV, action potentials with amplitudes of greater than 70 mV (measured from threshold), ov
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10. Post-natal development of electrophysiological properties of rat cerebral cortical pyramidal neurones.
1. The post-natal development of the electrophysiological properties of cortical layer V pyramidal neurons was investigated with intracellular recordings from rat sensorimotor cortical slices, in vitro. 2. At all ages post-natally (post-natal day 1 to day 36; P1-P36) neurons were capable of generating a train of Na+-dependent action potentials in response to