Multielectrode Arrays
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Análise da estacionariedade e gaussianidade da atividade elétrica neural, do ruído biológico e do ruído de instrumentação
This work analyzes signals of spontaneous neuronal electrical activity, measured by devices known as Multi-Electrode Arrays (MEA), which are the substrate of neuronal cultures of rat hippocampus. The database under investigation consists of five signals: (i) instrumentation noise, (ii) biological noise, (iii) inactive culture and (iv) two active culture expe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2011
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2. Processamento de sinais de atividade elétrica neuronal a partir de ferramentas matemáticas clássicas
Esta dissertação tem como objetivo fazer um estudo e processamento de dois tipos de sinais de atividade elétrica neuronal. O primeiro foi registrado a partir de matrizes multieletrodos (MEA), referentes a atividade espontânea de grupos neuronais em cultura. Foram analisadas duas culturas consideradas como inativas, ou seja, culturas que após alguns dias
Publicado em: 2009
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3. Avalanches neuronais durante o ciclo sono-vigÃlia de ratos
Neuronal avalanches are spatiotemporal patterns of neuronal activity that occur spontaneously in supercial layers of the mammalian cortex under various experimental conditions. Previous studies in brain slices and cultured cells have shown that the distribution of sizes P(s) of neuronal avalanches obeys a power law relationship: P(s) Â sÂa , with exponent
Publicado em: 2009
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4. Neurofisiologia hipocampal durante sessões de sono intercaladas por exploração espacial: Reverberação do passado ou predição do futuro?
The ability to predict future rewards or threats is crucial for survival. Recent studies have addressed future event prediction by the hippocampus. Hippocampal neurons exhibit robust selectivity for spatial location. Thus, the activity of hippocampal neurons represents a cognitive map of space during navigation as well as during planning and recall. Spatial
Publicado em: 2009
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5. Modelos de prediÃÃo linear para anÃlise de sinais eletroencefalogrÃficos (EEG) e de matrizes multieletrodo (MEA) / Linear-prediction models for electroencephalographic (EEG) and multielectrode-array (MEA) signal analysis
This work establishes models of neurophysiological signals, which are composed of spontaneous activity measurements taken by means of multielectrode arrays (MEAs) applied on in vitro cell cultures; as well as of neurological signals based on electroencephalography. These models suppose that MEAs are employed as neuroprostheses applied for detection and forec
Publicado em: 2006
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6. Modelos de predição linear para análise de sinais eletroencefalográficos (EEG) e de matrizes multieletrodo (MEA) / Linear-prediction models for electroencephalographic (EEG) and multielectrode-array (MEA) signal analysis
Esta dissertação objetiva propor modelos de sinais neurofisiológicos, oriundos de matrizes multieletrodo (MEA), utilizadas para a aquisição da atividade neural espontânea a partir de células em cultura; bem como medidas neurológicas obtidas de eletroencefalografia (EEG). Os modelos são desenvolvidos no contexto aplicativo de MEAs utilizadas como neu
Publicado em: 2006
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7. Desenvolvimento de um sistema multieletrodo para medidas voltametricas : voltametria multiplexada com uso de transformada de Hadamard
A multielectrode system for voltammetric analysis has been developed making use of the advantages related to the use of solid-statc ultramicroelectrodes (UMEs). The instrument is capable of dealing with 31 UMEs in two different forms: in the first one, it is possible to obtain a voltammetric curve using only 1 UME or groups of UMEs at the same potential; in
Publicado em: 1995
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8. Single-Unit Stability Using Chronically Implanted Multielectrode Arrays
The use of chronic intracortical multielectrode arrays has become increasingly prevalent in neurophysiological experiments. However, it is not obvious whether neuronal signals obtained over multiple recording sessions come from the same or different neurons. Here, we develop a criterion to assess single-unit stability by measuring the similarity of 1) averag
American Physiological Society.
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9. Chronic, multisite, multielectrode recordings in macaque monkeys
A paradigm is described for recording the activity of single cortical neurons from awake, behaving macaque monkeys. Its unique features include high-density microwire arrays and multichannel instrumentation. Three adult rhesus monkeys received microwire array implants, totaling 96–704 microwires per subject, in up to five cortical areas, sometimes bilatera
National Academy of Sciences.