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.
Results
Showing 1 to 20 of 70 for “"Default Mode Network"”.
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Neural Mechanisms Supporting Default Mode Network Regulation of Pain Sensitivity
… recent evidence suggests a possible role for the default mode network (DMN) both in pain and pain sensitivity. The present thesis aimed to determine the underlying neural mechanisms of DMN involvement in pain and whether the DMN contributes to inter-individual differences in pain sensitivity. …
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The role of the default mode network in contextual control
… in neuroscience: cognitive control and the default mode network. Chapter 2 considers why current studies of contextual control do not implicate DMN regions by comparing context-dependent decision making using rich, meaningful scenes, in comparison to arbitrary letter stimuli. DMN regions of …
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Investigating default mode network activation during external task switches and movie watching
The Default Mode Network (DMN), typically associated with internally-directed thought, shows increased activity during demanding external task switches between cognitive domains, as reported by Crittenden et al. (2015) and Smith et al. (2018), which challenges prevailing views of DMN function. What …
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A functional imaging study of the relationship between the Default Mode Network and other control networks in the human brain
The Default Mode Network (DMN) is a large-scale brain network implicated in the control and monitoring of internal modes of cognition. The aim of this research was to investigate DMN function and its relationship to other large-scale cognitive control networks through functional connectivity …
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FMRI guided DTI at the grey-white matter interface : with application to a connectivity analysis of the default mode network in Urbach-Wiethe disease
… regions which are connected in a large scale network via White Matter (WM) tracts. With fMRI (Functional Magnetic Resonance Imaging) it is possible to identify cortical regions involved in specific tasks, and with DTI (Diffusion Tensor Imaging) the structural connections between these areas …
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Altered Brain Networks In Patients with Psychogenic Non-Epileptic Seizures (PNES) Using Ultra High Field MRI
… of PNES by helping better understand brain networks in patients with PNES. This study examines brain networks in patients with PNES with a focus on the default mode network and salience network. Methods: Twelve patients with PNES between the ages of 18-56 and twelve age- and sex- matched …
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The influence and manipulation of resting-state brain networks in alcohol use disorder
… in the signature of large-scale, dynamic brain networks, which can show whether an intervention is effective. One such intervention is episodic future thinking, which has been shown to reduce delay discounting and orient people toward pro-social, long-term outcomes. To better understand decision …
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The Effects of Aging on Cross-Modal Attention
… stimuli was due to increased activity in the default mode network. Evidence did not support this hypothesis. The default mode was found to have lower resting activity in older adults than younger adults, and default mode activity did not correlate with auditory activity. However, the …
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Oxygen Polarography in the Awake Macaque: Bridging BOLD fMRI and Electrophysiology
… in non-human primates is an excellent model for studying neural activity related to high order brain function similar to that commonly studied with BOLD fMRI in humans, i.e. attention, working memory, engagement. This thesis discusses the development of, validation of, and first results …
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Differences in resting state functional networks in HIV infected and uninfected children at age 7 years
… have measured their impact on functional brain networks in young children. We use resting state functional magnetic resonance imaging (RS-fMRI) to explore differences in functional connectivity (FC) in HIV infected children stable on HAART and in HIV uninfected children. The 9 resting state …
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Assessing functional connectivity in the newborn brain using fNIRS
… the processes of emergence of resting state networks at a very early stage of life could shed light on the neuronal origins of these diseases. However, the study of the inception and development of functional connectivity in the newborn brain poses exceptional challenges, due to the …
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From Neural Dynamics to Psychological Profiles: A Comprehensive Study of Anxiety in Young and Adult Individuals
… social and economic impacts. While traditional models have focused on its psychological and clinical aspects, recent advances in neuroscience highlight the need for a more detailed understanding of anxiety as a brain-based phenomenon, exploiting multivariate approaches. This thesis indeed …
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Delay Discounting in At-Risk Preadolescents: Brain Mechanisms and Behavior
… need to suppress activity of key nodes of the default mode network (a task negative network) to a greater extent to properly allocate attention to the task.
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Neuroimaging and neurocognitive assessment of PTSD and MDD in a South African community setting
… within and between cognitive control networks (salience network, dorsal attention network, and frontoparietal networks) and a default mode network were compared across the 4 groups. Neuroanatomical indices (cortical thickness, volume, and surface area) of 10 frontal cortical regions …
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Resting-State Functional Connectivity in Veterans with Post-Traumatic Stress Disorder and Combat-Exposed Control Veterans: A Graph Theory Based Network Analysis
… resting-state functional connectivity within default-mode, salience, and central executive networks in an all-male sample of combat veterans with post-traumatic stress disorder (PTSD) and combat-exposed Control veterans. Prior studies of resting-state functional connectivity in PTSD samples …
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Resting-state Functional Connectivity Correlates of Inhibitory Control over Emotional Stimuli
… overlap in the salience and frontoparietal networks in relation to response inhibition. Seed-to-voxel analysis revealed significant connectivity between numerous seed networks in relation to response inhibition. Anti-saccade trials showed stronger functional connectivity between seeds (i.e. …
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Structural and Functional Properties of Social Brain Networks in Autism and Social Anxiety
The default mode network (DMN) is active in the absence of task demands and during self-referential thought. Considerable evidence suggests that the DMN is involved in normative aspects of social cognition, and as such, disruptions in the function of DMN would be expected in disorders characterized …
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Functional Localization of Brain Activity in the Iowa Gambling Task Using Graph-Theoretical Methods
… growing interest for researchers interested in network-based neuroimaging approaches. This study attempted to offer another useful extension of graph-theoretical approaches to functional neuroimaging. In particular, the neuroimaging study of the Iowa Gambling Task (IGT). Several task-related …
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Evaluation of Neuroplastic Changes in Psychological Intervention and Contemporary Treatments of Depression
… the amygdala, anterior cingulate cortex, the default mode network, and the prefrontal cortex. In combined modalities, a combination of psilocybin and acceptance and commitment therapy showed the greatest changes in symptom reduction and neuroplastic change. The overall findings contribute to …
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Longitudinal Changes in Resting-State Connectivity after Traumatic Axonal Injury
Little is known about neural network connectivity immediately after a traumatic axonal injury (TAI). This is the first longitudinal study in TAI to examine functional connectivity in the Default Mode Network (DMN) and Central Executive Network (CEN) within 48 hours after traumatic brain injury with …
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