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Bibliografias temáticas / R-fMRI

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Literatura científica selecionada sobre o tema "R-fMRI"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 1 de fevereiro de 2022

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Teses / dissertações sobre o assunto "R-fMRI"

1

Hollinger, Avrum. "Design of fMRI-compatible electronic musical interfaces." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116045.

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The designs of two functional magnetic resonance imaging-compatible electronic interfaces for use in neuropsychological studies involving musical tasks are presented. The devices, a two-button response box in the form of a computer mouse and a piano keyboard, were designed for rhythmic tapping and piano performance tasks, respectively. In order to correlate changes in neural activation acquired through magnetic resonance imaging (MRI) with task performance, the electronic collection of behavioural data, such as the timing of button or key presses was required. These behavioural measures were c

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2

Achtman, Rebecca L. "Investigation of shape processing using psychophysics and fMRI." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82811.

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In the early stages of visual processing (primary visual cortex) shapes are sampled by discrete, localized, visual filters. The integration of the outputs of these local filters allows us to detect global shape information. Although this integration process is critical for visual processing beyond the primary visual cortex, it remains poorly understood. This thesis investigates what limits the performance of the mechanisms used to detect global structure. In particular, we asked four questions: (1) What information is important for detecting global form? (2) How well can we detect shape

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3

Liao, Chuanhong 1964. "Estimating the delay of the hemodynamic response in fMRI data." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31260.

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The technique of functional magnetic resonance imaging (fMRI) is rapidly developing from one of technical interest to wide clinical application. fMRI exploits the fact that brain neural activity produces a change in blood oxygenation level dependent (BOLD) response which is recorded at each point in the brain. In a typical experiment, a subject is given a stimulus or cognitive task, and the statistical question is to relate it to the BOLD response, usually via a linear model. The BOLD response is not instantaneous; it is delayed and smoothed by about 6 seconds. In this thesis we propose a rapi

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4

Dumoulin, Serge O. "Motion mechanisms and cortical areas in human vision : psychophysics and fMRI." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82860.

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Our visual world contains both luminance- (first-order) and contrast-defined (second-order) information. Distinct mechanisms underlying the perception of first-order and second-order motion have been proposed from electrophysiological, psychophysical and neurological studies. In this thesis psychophysical and human brain imaging (fMRI) experiments are described that support the notion of distinct mechanisms, but extend the previous studies by providing evidence for a functional dissociation and a relative cortical specialization for first- and second-order motion.<br>Using psychophysica

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5

Wieckowska, Marguerite. "Cerebral blood flow measurement using fMRI and pet : a validation study." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79271.

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Functional magnetic resonance imaging (fMRI) is a technique allowing the study of hemodynamic changes in the brain. Having a number of advantages over positron emission tomography (PET), the current gold standard, fMRI appears like an attractive alternative to study brain function. However, the measurements obtained with fMRI have not been rigorously validated.<br>This thesis describes a study comparing cerebral blood flow (CBF) changes measured using a flow-sensitive alternating inversion recovery (FAIR) fMRI perfusion method, to the ones obtained using PET. We scanned 10 healthy normal volun

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6

Crane, David. "Neural correlates of spatial and temporal context memory, an fMRI investigation." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32582.

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Recent neuroimaging studies have found greater left and right prefrontal cortex (PFC) activity during spatial source and temporal recency tasks, respectively. It is unclear whether these findings result from inherent differences in PFC contributions to spatial vs. temporal memory retrieval or to differences in task difficulty and/or structure. To address this issue, I used event-related functional magnetic resonance imaging to assess healthy adults while they performed spatial and temporal memory tasks fo

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7

Mortin, Catherine Leanne. "fMRI responses to first- and second-order modulations of visual textures." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82621.

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The world around us contains a variety of visual information, both first-order (luminance-defined) and second-order (defined by characteristics other than luminance). Previous studies suggest that the human visual cortex employs distinct mechanisms for segregating regions whose borders are defined by modulations of first- and second-order properties. This study uses a new approach of human psychophysics and fMRI experiments to explore the brain responses to both first-order and second-order (orientation, spatial frequency and contrast) texture borders. The results reveal differential ac

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8

Malik, Saima. "Neural substrates of feeding behavior : insights from fMRI studies in humans." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115850.

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Feeding behavior is a complex phenomenon involving homeostatic signals, and non-homeostatic inputs such as visual cues. In primates, exposure to food-related sensory cues has been shown to elicit cephalic phase responses as well as trigger central appetitive processing, in a motivationally-dependent manner. Neural structures consistently implicated in such responses and/or in the regulation of ingestive behavior in general, in both monkeys and in humans, include the amygdala, insula, striatum, hypothalamus, and frontal and occipital cortices. In humans however, the cerebral response to visual

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9

Albanese, Marie-Claire. "FMRI evidence of memory representations of somatosensory stimuli in the human brain." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102949.

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Distinct brain regions process innocuous vibration and cutaneous heat pain. The role of these areas in the perception of pain is still a matter of debate; and the role of these areas in the mediation of memory of somatosensory stimuli is uncertain and has not been studied with brain imaging in healthy human volunteers. All experiments described here, involved an experimental design, which included a delayed-discrimination paradigm and functional magnetic resonance imaging (fMRI). In manuscript #1, we aimed at unraveling the cerebral correlates of attention and spatial localization of innocuous

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10

Copeland, Laura. "Audiovisual processing of affective and linguistic prosody : an event-related fMRI study." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111605.

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This study was designed to clarify some of the issues surrounding the nature of hemispheric contributions to the processing of emotional and linguistic prosody, as well as to examine the relative contribution of different sensory modalities in processing prosodic structures. Ten healthy young participants were presented with semantically neutral sentences expressing affective or linguistic prosody solely through the use of non-verbal cues (intonation, facial expressions) while undergoing tMRI. The sentences were presented under auditory, visual, as well as audio-visual conditions. The emotiona

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