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• W1567116079 abstract "Advances in neuroimage technologies, mainly with the development of functional magnetic resonance imaging (fMRI), improve the comprehension of brain processes and mechanisms. The main goal of this work is the development of a time-varying connectivity model between many brain areas using fMRI datasets. The dynamic modelling of the information flow is related to the parameters estimation of a timevarying multivariate autoregressive process, based on functions projection in wavelet basis. We propose an estimation procedure and present its asymptotic properties. Computational simulations were performed focusing the evaluation of the proposed approach. Further, applications of these methodologies to real functional magnetic resonance datasets are presented. Alguns jargoes e abreviacoes: BOLD: Blood Oxigenation Level Dependent. E o sinal medido em RMf. Conectividade Efetiva: Influencia de um modulo neuronal sobre outro. Conectividade Funcional: Correlacao na atividade de dois modulos neuronais. DVAR: Modelo autoregressivo vetorial com coeficientes variando no tempo. fatia: Imagem de uma seccao cerebral. GLM: Modelo linear geral. HRF: Funcao de resposta hemodinâmica. Mapa de Ativacao: Imagem representando as areas cerebrais ativadas durante uma tarefa especifica. Paradigma: Conjunto de atividades a ser executada por um individuo em um experimento de ressonância magnetica funcional. pixel: celula de uma matriz de brilhos, que de descreve uma imagem bidimensional. RMf: ressonância magnetica funcional. ROI: regiao de interesse. scan: aquisicao de um volume. sessao: conjunto de volumes de RMf adquiridos a cada vez que um individuo entra no scanner. slice: vide fatia. TR: intervalo de tempo entre a aquisicao de dois volumes consecutivos. VAR: Modelo autoregressivo vetorial. volume: Conjunto de fatias, que representa o cerebro como um todo. voxel: pixel que compoe um volume cerebral." @default.
• W1567116079 created "2016-06-24" @default.
• W1567116079 creator A5029606860 @default.
• W1567116079 date "2015-10-21" @default.
• W1567116079 modified "2023-10-17" @default.
• W1567116079 title "Modelo autoregressivo vetorial com coeficientes variantes no tempo e aplicações em RMf" @default.
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• W1567116079 doi "https://doi.org/10.11606/t.45.2007.tde-22042013-151911" @default.
• W1567116079 hasPublicationYear "2015" @default.
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