Firing Pattern
Mostrando 1-12 de 130 artigos, teses e dissertações.
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1. Alterações da morfologia dendrítica e epilepsia: uma abordagem neurocomputacional / Dendritic Morphology Alterations and Epilepsy: A Neurocomputational Approach.
Pesquisas in vivo e in vitro, têm estabelecido uma correlação entre alterações na morfologia dendrítica e a epilepsia. No entanto, ainda não se conhecem em detalhe as consequências dessas modificações, sobre a eletrofisiologia e o padrão de disparo. Também existe um fenômeno que não tem sido completamente explicado, conhecido como o paradoxo do
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
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2. A simple model for circadian timing by mammals
Circadian timing is structured in such a way as to receive information from the external and internal environments, and its function is the timing organization of the physiological and behavioral processes in a circadian pattern. In mammals, the circadian timing system consists of a group of structures, which includes the suprachiasmatic nucleus (SCN), the i
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-01
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3. Repetitive firing properties of developing rat brainstem motoneurones.
1. The repetitive firing properties of neonatal and adult rat hypoglossal motoneurones (HMs) were investigated in a brainstem slice preparation. Neonatal HMs could be classified into two main groups: (1) neurones with a decrementing or adapting firing pattern (type D); exhibiting an early and a late phase; and (2) neurones with an incrementing or acceleratin
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4. Dopamine controls the firing pattern of dopamine neurons via a network feedback mechanism
Changes in the firing pattern of midbrain dopamine neurons are thought to encode information for certain types of reward-related learning. In particular, the burst pattern of firing is predicted to result in more efficient dopamine release at target loci, which could underlie changes in synaptic plasticity. In this study, the effects of dopamine on the firin
The National Academy of Sciences.
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5. Characterization of a high-voltage-activated IA current with a role in spike timing and locomotor pattern generation
Transient A-type K+ channels (IA) in neurons have been implicated in the delay of the spike onset and the decrease in the firing frequency. Here we have characterized biophysically and pharmacologically an IA current in lamprey locomotor network neurons that is activated by suprathreshold depolarization and is specifically blocked by catechol at 100 μ
The National Academy of Sciences.
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6. Neural correlates of behavior in the moth Manduca sexta in response to complex odors
With Manduca sexta as a model system, we analyzed how natural odor mixtures that are most effective in eliciting flight and foraging behaviors are encoded in the primary olfactory center in the brain, the antennal lobe. We used gas chromatography coupled with multiunit neural-ensemble recording to identify key odorants from flowers of two important nectar re
National Academy of Sciences.
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7. Discharge patterns of cervical sympathetic preganglionic neurones related to central respiratory drive in the rat.
The central respiratory-drive-related inputs to antidromically identified cervical sympathetic preganglionic neurones have been investigated, in the rat, using extracellular recording techniques, the ionophoretic application of an excitatory amino acid (glutamate) to increase their excitability, and phrenic nerve discharge as an indicator of central respirat
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8. Morphology and membrane properties of neurones in the cat ventrobasal thalamus in vitro.
1. The morphological (n = 66) and electrophysiological (n = 41) properties of eighty-six thalamocortical (TC) neurones and those of one interneurone in the cat ventrobasal (VB) thalamus were examined using an in vitro slice preparation. The resting membrane potential for thirty-seven TC neurones was -61.9 +/- 0.7 mV, with thirteen neurones exhibiting delta o
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9. Effects of ionophoresed noradrenaline on the spontaneous activity of neurones in rat primary somatosensory cortex.
Changes in spontaneous activity of rat S1 cortical neurones with identified receptive fields were investigated in reply to ionophoresed noradrenaline (NA). Extracellular levels of NA were maintained constant by continuous electrochemical analysis at the carbon fibre recording tip of the multibarrel micro-electrode. In the absence of NA there were clear diffe
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10. Correlation between tremor, voluntary contraction, and firing pattern of motor units in Parkinson's disease
Patients with tremor of Parkinsonism show three characteristics of motor unit activity: rhythmic spontaneous resting discharge, abnormally low firing rates during voluntary contraction, and consistent differences in firing pattern between small and large motor units. Smaller units discharge once per tremor beat at weak contractions but change into bursts of
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11. Plasticity and tuning of the time course of analog persistent firing in a neural integrator
In a companion paper, we reported that the goldfish oculomotor neural integrator could be trained to instability or leak by rotating the visual surround with a velocity proportional to +/- horizontal eye position, respectively. Here we analyze changes in the firing rate behavior of neurons in area I in the caudal brainstem, a central component of the oculomo
National Academy of Sciences.
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12. Repetitive firing properties of medial pontine reticular formation neurones of the rat recorded in vitro.
1. Intracellularly recorded neurones in nucleus reticularis pontis caudalis of the medial pontine reticular formation (mPRF) in the in vitro slice preparation were analysed for repetitive firing properties in response to intracellularly applied constant-current pulses. 2. Three neuronal classes were defined by this procedure: (1) non-burst neurones, which ha