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 36 for “"brain mechanisms"”.
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Brain mechanisms of dreaming
This thesis comprises a series of six studies, aiming at clarifying some controversies surrounding the neuropsychological understanding of dreaming and the methodological issues of neuroanatomical investigation.
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Delay Discounting in At-Risk Preadolescents: Brain Mechanisms and Behavior
… substance use is associated with deficits in brain function and behavior. However, possible deficits that predate substance use initiation remain poorly characterized in preadolescents at-risk for developing substance use disorder (SUD). To characterize potential brain and behavioral …
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BRAIN MECHANISMS SUPPORTING EXPECTATION AND TOP-DOWN ATTENTION TO PAINFUL STIMULI
… sensory experience and related processing in the brain. In pain, top-down information such as expectations of lower pain or placebo treatments significantly reduces both subjective reports of experienced pain and pain-related brain activity. On another hand, top-down influences may be relevant to …
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Visual Enumeration and Estimation: Brain mechanisms, Attentional demands and Number representations.
… dissociable processes and they rely on different brain structures. This was done through a neuropsychological single case study as well as through the first large sample neuropsychological group study using a voxel-based correlation method. Following this, behavioural methods were used to examine …
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Exploring the brain mechanisms of breathlessness through the study of neurological patients
… explores the role of several regions of the brain which have been implicated to have a role in breathlessness perception either from brain imaging studies, or anecdotal evidence from neurological and neurosurgical patients. This thesis explores the neurophysiology of breathlessness with an …
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NEURAL MECHANISMS SUPPORTING COGNITIVE INFLUENCES ON SUPRASPINAL NOCICEPTIVE PROCESSING: INSIGHTS FROM BRAIN LESIONS
… attempts have been made to elucidate the mechanisms by which cognitive information influences the pain processing, most studies describe these influences in terms of the facilitation and attenuation of incoming sensory nociceptive information via descending pain control systems. However, …
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ONTOGENY AND NEURAL MECHANISMS OF VOCAL COMMUNICATION IN MUS MUSCULUS
… communication is ubiquitous across mammals, the brain mechanisms that enable the transition from infant vocalizations to adult vocalizations remain largely unknown. Studying the ontogeny of vocal communication in laboratory mice (Mus musculus) provides a tractable opportunity to begin to …
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Remembering the past : multimodal imaging of cortical contributions to episodic retrieval
… to gain insight into the spatial and temporal brain mechanisms supporting episodic retrieval. Chapter 1 reviews major findings and theories in the episodic retrieval literature grounding the open questions and controversies within the suggested framework. Chapter 2 describes an fMRI and MEG …
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Toward a greater understanding of the brain processes underlying handgrip and handgrip fatigue
… by muscle fatigue. However, the supraspinal mechanisms of handgrip and handgrip fatigue are not fully understood despite the importance of this fundamental movement, numerous publications, and its presence as a longstanding research topic. This thesis investigates the brain mechanisms of …
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Univariate and Multivariate fMRI Investigations of Delay Discounting and Episodic Future Thinking in Alcohol Use Disorder
… this dissertation aim at elucidating the neural mechanisms undergirding AUD, which could lead to more efficacious treatment and rehabilitation strategies. The propensity for impulsive decision making (choosing smaller, sooner rewards over larger, later ones) also known as delay discounting (DD), …
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Neural adaptive mechanisms in respiratory regulation : theory and experiments
… is understood about the neural centers in the brainstem that give rise to known varied respiratory responses. A more complete understanding of respiratory regulation necessitates better knowledge of these underling brain mechanisms. While the task of breathing may seem straightforward, the …
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Spatiotemporal brain imaging and modeling
… modeling to facilitate our understanding of brain cognition. Exploration of these brain mechanisms requires both structural and functional knowledge to (i) reconstruct the spatial distribution of the activity, (ii) to estimate when these areas are activated and what is the temporal sequence …
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Neural Correlates of Temporal Context Processing
… of the present studies is to investigate the brain mechanisms underlying temporal context processing by using both fMRI and ERP techniques. The fMRI study investigated whether hippocampal representations in CA1 and DG/CA3 subfields were sensitive to the flow of physical time, and if so, …
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Memory-related cognitive modulation of human auditory cortex: Magnetoencephalography-based validation of a computational model
… cortex. However, the underlying neuronal mechanisms are not well understood yet. In this dissertation I present a novel approach for integrating 'bottom-up' (neural network modeling) and 'top-down' (experiment) methods to study the dynamics of cortical circuits correlated to shortterm …
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Associations Between and Changes in Hippocampal Volume and the Cortisol Response Over Time: The Role of Childhood Maltreatment and Depression
Stress-related brain mechanisms, specifically HPA axis dysregulation and reductions in hippocampal volume, have long been associated with the pathology of major depressive disorder, especially within the context of a history of childhood maltreatment. However, investigations that examine the …
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Constructing multiple objects across space and time
… to combine these sensory signals in the brain into a single representation of an object or event. Temporal integration, the process of combining information over time is one important prerequisite for it. Likewise, multisensory integration, the process of combining information from …
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Task-specific and interpretable feature learning
… hand, deep networks are shown to be analogous to brain mechanisms. They exhibit the ability to describe semantic content from the primitive level to the abstract level. This dissertation thus also presents a preliminary investigation of the synergy between feature learning with cognitive science …
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Genetically encodable calcium sensors for Magnetic Resonance Imaging
… for understanding the workings of the brain is to fill in the explanatory gap between molecular phenomena and identifiable behavior at the organismal level. Magnetic resonance imaging (MRI) provides a unique tool for bridging this gap, as it allows for imaging tissue throughout whole …
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Devleopmnet of Distriubted Nueral Sysetms for Readnig in Heatlhy and Brian-Injrued Chlidren (If you can read this, you have a well-developed whole word reading system. It should read Development of Distributed Neural Systems for Reading in Healthy and Brain-Injured Children)
… invention too recent to have evolved dedicated brain mechanisms. In the present thesis, we manipulated word frequency and spelling-to-sound consistencies to favor one or the other reading strategy in young readers aged 7-10. Functional magnetic resonance imaging (fMRI) recordings demonstrate …
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