Event Related Fmri
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Processing of affective faces varying in valence and intensity in shy adults: an event-related fMRI study
Recent behavioral and electrocortical studies have found that shy and socially anxious adults are hypersensitive to the processing of negative and ambiguous facial emotions. We attempted to extend these findings by examining the neural correlates of affective face processing in shy adults using an event-related fMRI design. We presented pairs of faces that v
Psychol. Neurosci.. Publicado em: 2013-06
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2. A numerical study of the Kullback-Leibler distance in functional magnetic resonance imaging
The Kullback-Leibler distance (or relative entropy) is applied in the analysis of functional magnetic resonance (fMRI) data series. Our study is designed for event-related (ER) experiments, where a brief stimulus is presented and a long period of rest is followed. In particular, this relative entropy is used as a measure of the "distance" between the probabi
Brazilian Journal of Physics. Publicado em: 2008-03
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3. Avaliação do tratamento de depressão em pacientes com doença de Parkinson através de ressonância magnética funcional / Evaluation of depression treatment in Parkinsons disease patients with functional magnetic resonance
The neural circuitry underlying depression in patients with Parkinsons disease (PD) is unknown, let alone the treatment effects of antidepressant therapy. Neuroimaging methods can give insights into the pathogenesis of depression and also in the mechanisms of action related to specific treatment choice. In order to evaluate differences between PD patients wi
Publicado em: 2008
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4. Detecção e caracterização da resposta hemodinâmica pelo desenvolvimento de novos métodos de processamento de imagens funcionais por ressonância magnética / Detection and estimation of the hemodynamic response by new functional magnetic resonance imaging methods
Os estímulos evento-relacionados (event-related functional magnetic resonance imaging - ER-fMRI) têm se tornado mais popular nos últimos anos. A maioria das análises das séries temporais geradas nesses exames é baseada em um modelo específico da função resposta hemodinâmica, hemodinamic response function (HRF). Contudo, a considerável variabilidad
Publicado em: 2006
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5. NEURAL AND COGNITIVE STUDIES OF THOUGHT DISORDER IN SCHIZOPHRENIA
Thought Disorder (TD) is one of the most striking features of schizophrenia and is manifested clinically as abnormal speech. Despite being a core feature of the illness very little is known of its pathophysiology. One model based on a series of word-pair priming studies formulates TD as a consequence of hyper activation of the semantic network. However, as w
Publicado em: 2002
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6. Right hemispheric dominance of inhibitory control: An event-related functional MRI study
Normal human behavior and cognition are reliant on a person’s ability to inhibit inappropriate thoughts, impulses, and actions. The temporal and spatial advantages of event-related functional MRI (fMRI) were exploited to identify cortical regions that showed a transient change in fMRI signal after the withholding of a prepotent motor response. The temporal
The National Academy of Sciences.
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7. When zero is not zero: The problem of ambiguous baseline conditions in fMRI
By using blocked and rapid event-related functional MRI studies of memory, we explored the implications of using rest periods as a baseline condition in functional MRI studies. Activity in the medial temporal lobe (as well as in other brain regions) was substantially higher during rest than during several alternative baseline conditions. The effect of this e
The National Academy of Sciences.
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8. Physiological basis and image processing in functional magnetic resonance imaging: Neuronal and motor activity in brain
Functional magnetic resonance imaging (fMRI) is recently developing as imaging modality used for mapping hemodynamics of neuronal and motor event related tissue blood oxygen level dependence (BOLD) in terms of brain activation. Image processing is performed by segmentation and registration methods. Segmentation algorithms provide brain surface-based analysis
BioMed Central.
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9. Neural mechanisms of planning: A computational analysis using event-related fMRI
To investigate the neural mechanisms of planning, we used a novel adaptation of the Tower of Hanoi (TOH) task and event-related functional MRI. Participants were trained in applying a specific strategy to an isomorph of the five-disk TOH task. After training, participants solved novel problems during event-related functional MRI. A computational cognitive mo
The National Academy of Sciences.
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10. Predicting the practice effects on the blood oxygenation level-dependent (BOLD) function of fMRI in a symbolic manipulation task
Based on adaptive control of thought-rational (ACT-R), a cognitive architecture for cognitive modeling, researchers have developed an information-processing model to predict the blood oxygenation level-dependent (BOLD) response of functional MRI in symbol manipulation tasks. As an extension of this research, the current event-related functional MRI study inv
The National Academy of Sciences.
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11. Gesture Subtype–Dependent Left Lateralization of Praxis Planning: An Event-Related fMRI Study
Ideomotor apraxia is a disorder mainly of praxis planning, and the deficit is typically more evident in pantomiming transitive (tool related) than intransitive (communicative) gestures. The goal of the present study was to assess differential hemispheric lateralization of praxis production using event-related functional magnetic resonance imaging. Voxel-base
Oxford University Press.
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12. From Phonemes to Articulatory Codes: An fMRI Study of the Role of Broca's Area in Speech Production
We used event-related functional magnetic resonance imaging to investigate the neuroanatomical substrates of phonetic encoding and the generation of articulatory codes from phonological representations. Our focus was on the role of the left inferior frontal gyrus (LIFG) and in particular whether the LIFG plays a role in sublexical phonological processing suc
Oxford University Press.