Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"brain connectivity"”.
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Brain Connectivity in Autism Spectrum Disorder
… have been considered as resulting from altered connectivity between regions, which may explain characteristic manifestations in socio-emotional function, communication and repetitive behaviour observed clinically. This thesis aims to provide evidence for altered anatomy of networks in …
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Generative models of brain connectivity for population studies
Connectivity analysis focuses on the interaction between brain regions. Such relationships inform us about patterns of neural communication and may enhance our understanding of neurological disorders. This thesis proposes a generative framework that uses anatomical and functional connectivity …
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Functional Brain Connectivity Estimators: Understanding and Developing New Methodologies
… are used for constructing a specific part of the brain functional networks (i.e., functional connectivity or the relationship between different parts of the functional networks). In addition, we will develop new methodologies for estimating functional connectivity and propose modifications for …
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High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity
… has emerged as a unique method to characterize brain tissue microstructure non-invasively. DTI typically provides the ability to study white matter structure with a standard voxel resolution of 8μL over imaging field-of-views of the extent of the human brain. As such, it has long been …
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The influence of methylphenidate on heart rate and brain connectivity
… that muscle recruitment is regulated by the brain through subconscious homeostatic control of afferent feedback. It has been suggested that the dopaminergic system plays a key role in the CGM, with dopaminergic activation leading to lower fatigue thresholds. Key neural circuits, including the …
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Anomaly detection in brain connectivity structure : an application to epilepsy
… approaches for detecting anomalous regions in brain connectivity networks estimated from resting state fMRI. We are motivated by the problem of localizing diseased regions to be resected in pre-surgical epilepsy patients. Our goal is to investigate the potential of these non-invasive …
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Alterations in brain connectivity after spinal cord injury using functional MRI
… be used to characterize SCI. Altered functional connectivity in the brain has been observed in a number of neurological patient populations. Hence, it was hypothesized that such alterations in brain connectivity occurs after SCI as well. In this study, functional magnetic resonance imaging (fMRI) …
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Application of Deep Learning to Brain Connectivity Classification in Large MRI Datasets
The use of machine learning for whole-brain classification of magnetic resonance imaging (MRI) data is of clear interest, both for understanding phenotypic differences in brain structure and function and for diagnostic applications. Developments of deep learning models in the past decade have …
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Structural brain connectivity of HIV-positive children: a graph network analysis study
… Prior imaging studies have shown abnormal brain structure in adults and children infected by HIV. Graph theory analyses have been applied to HIV neuropathogenesis previously, these have demonstrated significant disruptions to brain connectivity in older HIV+ adults on treatment. However, no …
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Computational Methods for the Assessment of Brain Connectivity in Visuo-Motor Integration Processes
… of the networks connecting different brain areas, as well as the understanding of their role in executing complex behavioral tasks, are crucial issues in cognitive neurosciences. In this context, several time series analysis approaches are available for the investigation of brain …
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Mapping inter-subject and inter-regional brain connectivity during free viewing of novel natural scenes
Traditional functional magnetic resonance imaging (fMRI) studies have used controlled tasks such as finger tapping to isolate function in distinct cortical. Recent studies have examined the mechanisms involved during natural conditions by asking subjects to freely view the presentation of a movie. …
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Effects of methamphetamine on prenatally exposed children in Cape Town: cognition and intrinsic functional brain connectivity
… exposure (PME) on cognition and the developing brain in a sample of affected children in Cape Town, South Africa. Thus, this is a two-part study: the first part examines the effects of PME on neuropsychological outcomes, and the second part examines the effects of PME on intrinsic functional …
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Models and algorithms of brain connectivity, spatial sparsity, and temporal dynamics for the MEG/EEG inverse problem
… provide high temporal resolution recordings of brain activity, offering a unique means to study fast neural dynamics in humans. Localizing the sources of brain activity from MEG/EEG is an ill-posed inverse problem, with no unique solution in the absence of additional information. In this …
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Intrinsic functional brain connectivity in South African methamphetamine users undergoing inpatient treatment, with or without additional cognitive training
… MA alters intrinsic resting state functional connectivity (rsFC), and this may contribute to neuropsychological deficits observed in methamphetamine use disorder (MUD). Methods: This nested study analysed data described in Brooks et al. (2016), in which WM training was used as an adjunct to …
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Characterizing Connectivity in Brain Networks Using Magnetic Resonance Imaging
The human brain is a system of neurons that provides great computational capacity via a complicated communication network. A complete description of this network, also known as the human connectome, is an active topic of research as it would provide invaluable knowledge to cognitive neuroscience. …
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Fully Hyperbolic Graph Convolutional Neural Networks for Age Prediction with Multi-Modal Brain Data
Characterizing age-related alterations in MEG brain networks holds great promise in understanding aging trajectories and revealing aberrant patterns of neurodegenerative disorders, such as Alzheimer’s disease. In this study, we utilize a Fully Hyperbolic Neural Network (FHNN) to embed functional …
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Moment-to-moment Variability of Intrinsic Functional Connectivity and Its Usefulness
The brain connectivity of resting-state fMRI (rs-fMRI) represents an intrinsic state of brain architecture, and it has been used as a useful neural marker for detecting psychiatric conditions such as autism spectrum disorder, as well as for predicting psychosocial characteristics such as age. …
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DYNAMIC FUNCTIONAL CONNECTIVITY NETWORKS: NEW ANALYSIS AND INTERPRETATION STRATEGIES
Traditional brain network studies have implicitly assumed that functional connectivity between distinct brain regions is static over the recording period of resting state scans. Brain network organization must dynamically recognize, integrate and respond to internal and external stimuli across …
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