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 33 for “"oscillatory activity"”.
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Gamma oscillatory activity in autism spectrum disorder during a face cueing task
… suggesting that impaired generation of gamma activity in the prefrontal cortex may be involved in impairments in social cognitive functions such as joint attention in ASD. In contrast to previous research, findings did not support higher posterior gamma power in ASD, indicating a need for …
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EEG Features of Working Memory Impairment in Alzheimer’s Dementia and Mild Cognitive Impairment
… elucidated. Research has reliably shown that oscillatory activity, driven by repetitive and synchronous activity within and between neuronal populations, plays a significant role in memory functioning and can be accurately captured using electroencephalography (EEG). While resting-state …
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Neuronal Network Oscillations in the Control of Human Movement
… understand the relationship between cortical oscillatory activity and the control of human movement. Modulations in motor cortical beta and alpha activity have been consistently implicated in the preparation, execution, and termination of movement. Here, I describe the outcome of four studies …
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Keep calm and age well: Behavioural and electrophysiological investigations into the effects of cumulative stress exposure on ageing cognition
… recordings of the cortical oscillatory activity thought to underlie cognitive operations. In a theoretical sense, work presented in this thesis strengthens past investigations highlighting the adverse effects of life stress on elderly peoples’ working memory abilities by …
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Cellular and Circuit Properties of Slow Oscillations In The Thalamic Reticular Nucleus
… nucleus (TRN) generate distinct types of oscillatory activity. While the reciprocal synaptic circuits between TRN and sensory thalamic nuclei underlie the generation of sleep spindles, the mechanisms regulating slow (<1 >Hz) forms of thalamic oscillations are poorly understood. Under …
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Shedding light on memory retrieval: reactivation of related information and its association with the hippocampus
… both in terms of relating the reactivation activity to structural measures of the hippocampus but also to possible methods by which the hippocampus and sensory cortex communicate. Additionally, this reactivation phenomenon was studied across the lifespan by demonstrating the earliest known …
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Reinforcement Learning Describes the Computational and Neural Processes Underlying Flexible Learning of Values and Attentional Selection
… intracranial EEG to investigate the strength of oscillatory activity in ventromedial prefrontal cortex. In the first project, the RL framework is applied to a feature-based attention task that required macaques to learn the value of stimulus features while ignoring non-relevant information. By …
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An Electrophysiological Investigation into the Role of Cognitive Control in the Attentional Blink
… and event-related and resting alpha frequency oscillatory activity (reflecting degree of attentional investment), are used to explain both intra- and inter-individual variability in performance on the AB task. Results supported the hypothesis that stronger cognitive control and greater …
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Neural Underpinnings of Walking Under Cognitive and Sensory Load: A Mobile Brain/Body Imaging Approach
… task) manipulations on gait and cortical neuro-oscillatory activity in young adults. While walking under increased load, participants adopted a more conservative pattern of gait by taking shorter and wider strides, with cognitive load in particular associated with reduced motor variability. …
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Effects of Reticular Activation on Long-Term Depression in Primary Visual Cortex of the Long-Evans Rat
… depression (LTD) is a widely studied form of activity-dependent synaptic plasticity, typically induced by prolonged low-frequency stimulation (LFS). LFS is highly effective in eliciting LTD in vitro, but several studies have failed to induce LTD using LFS in vivo, for reasons that remain …
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Microdomain calcium oscillations in Drosophila glia regulate seizure susceptibility and require NCKX
Glial cells exhibit spontaneous and activity-dependent fluctuations in intracellular Ca²+, yet it is unclear whether glial Ca²+ oscillations are required during neuronal signaling. Somatic glial Ca²+ waves are primarily mediated by the release of intracellular Ca²+ stores, and their relative …
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State Space Methods Using Biologically-Relevant Generative Models to Analyze Neural Signals
… for their mechanistic importance in coordinating activity within and between brain circuits. Co-occurring broad-band, non-periodic signals are also ubiquitous in neural data and are thought to reflect the characteristics of population-level neuronal spiking activity. Identifying oscillatory …
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A neurophysiological and proteomic study of cognitive enhancing strategies
… cognitive enhancing drugs on emergent network oscillatory activities in hippocampal slices are investigated. The effect of an enriched environment, which causes an improvement in cognitive function, on the expression level of proteins in the hippocampus is also investigated. The development of …
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Electrophysiological systems underlying human domain-general cognition and selective attention
… of electrophysiological systems—including oscillatory, aperiodic, and evoked responses—to these processes, using a combination of cutting-edge techniques such as MEG/EEG, MEG-fMRI fusion, and concurrent TMS-EEG. The research aims to examine how these electrophysiological responses encode …
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Electrophysiological studies of identifying and modulating the preparatory strategic processes involved in episodic memory retrieval
… of multivariate pattern analysis (MVPA) of oscillatory activity. Experiment 1 established evidence of a preparatory form of retrieval orienting and examined the potential fluctuation versus stability of such processing. Experiment 2 attempted to directly modulate the engagement of orienting …
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Advanced Bioelectronic and Microphysiological Systems for Functional Studies of Stem Cell-Derived Neural Models
… interface cerebral organoids and changes in oscillatory activity possibly linked to metabolic recycling. • The development of a full GUI framework for electrophysiological analysis, providing morphological and electrophysiological context to analysis. Together, these platforms advance the …
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Evaluation of an accessible automatic sleep spindle detector
… of sleep spindles, a short burst of neural oscillatory activity, demonstrating the need for good spindle detection. Currently this is done manually by sleep experts, but it is time consuming, motivating research into the creation of automatic spindle detectors. In this thesis, the sleep …
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Developmental Alterations to the Alpha-Beta Neural Oscillations Underlying Verbal Working Memory Function in Children and Adolescents
… the developmental trajectory of neural oscillatory activity, specifically within the alpha-beta frequency range (~8-18 Hz), that supports WM encoding and maintenance processes in children and adolescents. This study also aimed to understand how the development of WM-related oscillatory …
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On the role of neuronal oscillations in auditory cortical processing
… <p>For all studies, laminar profiles of synaptic activity, (indexed by current source density analysis) and concomitant firing patterns in local neurons (multiunit activity) were acquired simultaneously via linear array multielectrodes positioned in A1. The initial study of this dissertation …
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Brain Rhythms in Object Recognition and Manipulation
… with objects represent the most fundamental activity in our everyday life. Whereas the grasp of an object is driven by the perceptual senses, using an object for its function relies on learnt experience to retrieve. Recent theories explain how the brain takes decisions based on perceptual …
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