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 35 for “"Default-mode network (DMN)"”.
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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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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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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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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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Wandering minds, restless brains and mindful thinking : a network-based perspective
… is a major component of the executive control network that increased in activation during tasks involving working memory and mental control. Young adults exhibit greater working memory capacity (how much information could be maintained and manipulated in mind) with greater MPFC-DLPFC negative …
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Predictions in a dynamic world: the adaptive role of the Active Prediction Network
… processes are supported by a left-dominant network incorporating both semantic and domain-general control regions: the Active Prediction Network (APN). This distinctive topographical overlap suggests that the mechanism for active prediction repurposes the neural machinery typically involved …
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Demographic Differences in Resting State EEG in Healthy Controls and Patients with Schizophrenia
<p>The default mode network (DMN) is composed of neural nodes that are synchronously activated when the brain is at rest and displays a decrease in activation when the brain is involved in a task. Disruptions in the DMN can potentially serve as assessment/screening for individuals with …
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DTI-based tractographic analysis of white matter alterations in HIV infected children
… changes in white matter and functional networks in a cohort of 7-year-old HIV infected (HIV+) children who intiatied early cART compared to uninfected controls. To explore possible relationships between these alterations, we used tractography to identify HIV-related abnormalities within …
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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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Representational dynamics across multiple timescales in human cortical networks
… within sensory regions, multiple demand (MD) network, and default mode network (DMN). Chapter 1 provides a background review of the current literature. It begins by reviewing experimental investigations of component visual processes that unfold over time. Next, the MD network is introduced as …
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Hyperbolic graph embedding of magnetoencephalography brain networks to study brain alterations in patients with subjective cognitive decline
… tasks. Using a Hyperbolic Graph Convolutional Network (HGCN), we embed functional brain connectivity graphs derived from magnetoencephalography data to a Poincare disk instead of traditional Euclidean space. The Poincare disk is a negatively curved unit disk that encourages a continuous …
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The inefficiency of open-loop fMRI experiments
The default mode network (DMN) is a highly cited neural network whose functional roles are not well understood. Until recently, event related fMRI experiments used to study the DMN could only be conducted in an open-loop format. The purpose of this study was to demonstrate the potential statistical …
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Resting-State Functional Connectivity in Collision and Contact Female Athletes Over the Course of a Season
… functional connectivity (rsFC) of brain networks in a sample of female varsity athletes over the course of a season. Design: 19 female university athletes involved in contact (N = 7) and collision (N = 12) sports underwent functional MRI scans at both pre- and post-season. A group-level …
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Attention-Deficit/Hyperactivity Disorder (ADHD) and the influence of multisensory processes and sensorimotor integration on motor performance
… at post-measure may reflect activation of the Default Mode Network (DMN) and attentional changes, both of which are noted to be implicated in ADHD. As a whole, these findings provide a further understanding of the neurophysiological characteristics associated with ADHD, and their implications …
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Effects of bipolar disorder on intrinsic brain networks
Introduction: Bipolar disorder (BD) is a brain network disorder that affects cognitive and emotional functioning, and is associated with prefrontal and/or limbic dysfunction. Functional Magnetic Resonance Imaging (fMRI) allows identification of intrinsic brain networks (IBN), like the default mode …
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Quantifying the Benefits of Multisensory Biophilic Restorative Experiences: An Empirical Study Measuring Effects on How Engineers Feel, Think, and Design
… specifically within main hubs of the Default Mode Network (DMN). However, better engagement of the DMN did not result in more original design products. No significant differences were found for exploration of the design space across conditions. Interestingly, the visual group …
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Inhibitory Control Changes in Healthy Aging, Alzheimer’s Disease and Amnestic Mild Cognitive Impairment: An FMRI Study of the Stroop Task
… in frontal brain areas, which correlated with default mode network (DMN) seeds. Functional connectivity was similar between aMCI and controls, suggesting that functional connectivity of Stroop and DMN ROIs remain spared early in the disease. Our results suggest that reaction times alone may not …
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Cognitive-Motor Integration In Normal Aging And Preclinical Alzheimer's Disease: Neural Correlates And Early Detection
… group. Decreased functional connectivity in the default mode network (DMN) was also found in high AD risk participants. Furthermore, measures of white matter integrity and resting-state functional connectivity with DMN seed-regions were significantly correlated with task performance. These data …
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Factors Affecting Resting-State Functional Connectivity Across Three Intrinsically Connected Networks in Traumatic Brain Injury
… within three intrinsically connected networks; the default mode network (DMN), central executive network (CEN), and salience network (SN). The aim was to develop a predictive model for each network, based off a combination of cognitive performance, brain volumetric factors, …
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Network identification via multivariate correlation analysis
… approach to assess connectivity in a complex network was proposed. In network connectivity studies, a major problem is to estimate the links between the elements of a system in a robust and reliable way. To address this issue, a statistical method based on Pearson’s correlation coefficient was …
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