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 56 for “"Wakefulness"”.
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Brain dynamics of behavioral state transitions across sleep and wakefulness
Virtually every organism with a nervous system must enter a reversible state of quiescence, namely sleep, to maintain brain function. Sleep contributes to major aspects of cognition - including mood, attention, learning, memory, and decision making - and almost all neuropsychiatric disorders are …
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Sleep/wakefulness versus urethane anesthesia: analogous arousal states for respiratory control?
… squirrels spent approximately 33% of the time in wakefulness(W), 31% to 14% in light sleep (LS) and 32% to 48% in slow-wave sleep (SWS). Less than 5%of the time was spent in rapid-eye-movement (REM) sleep. Urethane-anesthetized animals spent approximately the same amount of time in each arousal …
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Conflict and adaptation: Identifying the markers of cognitive control in the transition from wakefulness to sleep
… changes that follow the transition from wakefulness to sleep. All studies presented have been driven by the hypothesis that consciousness is selectively required for some cognitive processes and not others. As such, fluctuations in alertness are hypothesised expected to produce a larger …
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The Effects of Self-Guided Meditation and Napping on Memory Consolidation in Humans
… that, compared to an equivalent period of wakefulness, post-training sleep (overnight or daytime naps) benefits memory consolidation (Diekelmann & Born, 2010; Mednick, Nakayama, & Stickgold, 2003; Plihal & Born, 1999; Walker et al., 2003). However, most investigations have employed various …
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Using an extended theory of planned behaviour to investigate sleep impaired driving
… has shown that driving after 15 or more hours of wakefulness increases the risk of being involved in a sleep-related vehicle accident (Stutts et al., 2003). Further, young and elderly adults have been found to have more sleep-related accidents between midnight and 6am and between 3pm and 6pm, …
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The Impact of Synchrony On Neuronal Coding and Behavior
… in rest but low prevalence of synchrony during wakefulness. We next tested whether propagation of synchrony across cortical circuits is state dependent. By optogenetically inducing On and Off state transitions within a single cortical layer during wakefulness, we found that synchronized neural …
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Subcortical Inputs Governing Cortical Network Activity
… same neurons, under anesthesia and subsequent wakefulness, in the rat barrel cortex. In every cell examined throughout layers 2-6, wakefulness produced a temporal pattern of synaptic inputs differing markedly from those under anesthesia. Recurring periods of synaptic quiescence, prominent under …
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The functional neurophysiological sequelae associated with high frequency dream recallers
… model positing that intra-sleep wakefulness is required for dream traces to be encoded into long-term storage, essentially proposing increased DRF as a product of a better memory for dreams. Results from recent studies support this model by demonstrating longer periods of …
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Spatio-temporal dynamics of spontaneous neural activity during the transition from slow oscillations to an awake-like state in isolated cortical networks
… travelling wave. During the tran- sition towards wakefulness, globally synchronous SO break down, giving rise to asynchronous awake-like states or micro-arousals. There is currently a shortage of quantitative techniques to detect such state transitions in neurophysiological record- ings. Notably, …
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Predictors Of Interindividual Differences In Vulnerability To Neurobehavioral Consequences Of Chronic Partial Sleep Restriction
… on the PVT, older age, and ability to sustain wakefulness on the MWT were associated with relative resilience to decrements in vigilant attention during sleep restriction. Interindividual differences in vulnerability to the effects of sleep loss were not accounted for by prior sleep history, …
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A Mathematical Model of the Sleep-Wake Cycle
… cycle usually consists of three distinct states: wakefulness, non-rapid-eye-movement (NREM) and rapid-eye-movement (REM). The process of switching between different states is complex, but a common assumption is that it is regulated primarily by two processes (the circadian and the homeostatic …
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HERE NOR THERE
… that interrogates dreams and dreaming—both wakefulness and unconsciousness. The book examines themes of family and the environment through the lens of Consciousness Studies in relation to lucid dreaming, memory, and cultural practices. More specifically, <em>Here Nor There </em>is an ode to …
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The Effects of Chronic Sleep Deprivation on Sustained Attention: A Study of Brain Dynamic Functional Connectivity
… to assess human sustained attention in rested wakefulness and chronic sleep deprivation conditions. Partial least squares approach was applied to distinguish brain functional connectivity for the experimental conditions. With the integration of a sliding-window approach, dynamic patterns of …
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The Impact of Cortical State On Neural Coding and Behavior
… in local population synchrony during wakefulness play any role in modulating network and behavioral performance. We found that populations of cells exhibit rapid fluctuations in synchrony of ongoing activity ranging from desynchronized responses, indicative of high alertness, to more …
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The Molecular Correlates of Sleep and Sleep Deprivation in vivo and in vitro
… are induced during both spontaneous and enforced wakefulness, and facilitates the dissociation of genes whose expression is tightly linked to the current wake state of the animal from those whose expression is linked to the total amount of wakefulness recently experienced by the animal. Like …
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An electrophysiological examination of intentional and inadvertent sleep onset : the effect of intention on the sleep onset process
… Test (MSLT) and the Repeated Test of Sustained Wakefulness (RTSW) were used to compare intentional and inadvertent sleep onset. Sixteen female participants (aged 19-25) spent two non-consecutive nights in the sleep lab; however, due to physical and technical difficulties only 8 participants …
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Manipulating the Mind: The Ethics of Cognitive Enhancement
… functions--memory, learning, attention, focus, wakefulness, and so on--in normal individuals. Although many interventions including education and the use of computers can be called cognitive enhancers, it is the more unconventional means of cognitive enhancement that tends to be the center of …
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Cholinergic Control of Cortical Circuit Activity
… state transitions that occur during periods of wakefulness. Yet, the underlying circuit mechanisms of synaptic cholinergic function in the neocortex remain unclear. Moreover, acetylcholine continues to be widely viewed as a slow and diffuse neuromodulator, despite the preponderance of in vivo …
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Investigation of Sleep Neural Dynamics in Intracranial EEG Patients
… observed in alpha band activity between wakefulness and rapid eye movement (REM) sleep in frontal and temporal regions of iEEG patients. Lastly, we implement an automated sleep scoring method relying on the variations in alpha and delta bands power during sleep which can be applied to …
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