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 27 for “"alpha power"”.
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Dynamics of alpha power in multimodal processing
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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The good, the bad, the complex: Investigating the behavioural consequences of EEG alpha oscillations in visual detection and selective attention
… in ongoing brain activity, especially in the alpha band (8-12 Hz) of the scalp-recorded electroencephalogram (EEG), with variability in the detection of visual stimuli. Lower alpha power over posterior cortex is generally assumed to lead to superior detection performance. It has also been …
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Electrophysiological Correlates of Prosocial Emotions
… by resting-state electroencephalography (EEG) alpha power at individual peak frequencies. Trait gratitude was not significantly associated with either HF_RSA or resting-state alpha power, indicating that dispositional gratitude may not be directly reflected in baseline autonomic or cortical …
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Unsupervised discovery and validation of affective engagement states using synchronized EEG and eye-tracking during digital learning
… processed using sliding windows to extract band-power features. Frontal Alpha Asymmetry (FAA; log alpha power difference, F4–F3) and the Beta–Alpha ratio (BA; log beta/alpha power ratio) were used as affective proxies. Instead of predefined emotion labels, unsupervised clustering methods were …
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THE EFFECTIVENESS OF BUPROPION SR ON DEPRESSIVE SYMPTOMS IN SMOKERS: SELF-REPORTS, EEG, AND INDIVIDUAL DIFFERENCES
… Glassman et al., 1998). Here the parietal EEG alpha asymmetry was used as a dimensional neuropsychological marker of depressive symptoms (i.e., the more depressed, the higher alpha power in the right vs. left parietal lobe during visuospatial tasks [Henriques & Davidson, 1997; Rabe et al, …
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Electrophysiological systems underlying human domain-general cognition and selective attention
… (MVPA), I show that both aperiodic (broadband power, slope, and intercept) and oscillatory (theta, alpha, and beta power) components encode task demand and content across three cognitive tasks. Aperiodic broadband power, in particular, shows the strongest decoding performance and cross-task …
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Task-Dependent Oscillatory Brain Activity During Oculomotor Delayed Response Task
… demands during the delay period. Changes in alpha power were used to index cognitive efforts during the delay period. Continuous EEGs from 25 healthy young adults (18-34 years) were recorded using dense electrode array. The data was analyzed by 6-cycle Morlet wavelet decompositions in the …
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No tDCS Augmented Working Memory Training Benefit in Undergraduates Rewarded with Course Credit
… regions enhanced theta phase locking, reduced alpha power, and strengthened theta-gamma phase amplitude coupling. Objective: To determine whether tDCS to frontal or parietal sites optimized WM training gains we pre-registered a tDCS-WM training study. Methods: 80 undergraduates were randomly …
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Exploring Neural Activities in the Prefrontal Cortex of Fragile X Syndrome Mouse Models Using Electroencephalography
… EEG studies have identified alterations in gamma power, alpha slowing, cross-frequency coupling, and reduced signal complexity, suggesting potential translational biomarkers of network dysfunction. However, the extent to which these signatures are conserved in preclinical models—especially in …
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The neurophysiology of intersensory selective attention and task switching
… <p>Neural oscillations in the alpha band (~8-14 Hz) have been shown to index the distribution of selective attention, and there is increasing evidence that oscillations in this band are in fact utilized by the nervous system to suppress distracting, task-irrelevant information. …
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Personality, Affect and EEG: An Integration of Three Models to Predict Neural Patterns of Activity
… frontal and posterior electroencephalogram (EEG) alpha were associated with basic dimensions of personality, extraversion and neuroticism. A theoretical model proposed that extraversion and neuroticism (measured by the NEO-PI-R) were related to the affect circumplex and Heller's (1990, 1993) model …
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Alpha thalamocortical networks during propofol general anesthesia and disorders of consciousness
Alpha (8-12 Hz) rhythms are a fundamental feature of awake electroencephalography (EEG), thought to be generated by circuits connecting the cortex and thalamus. These rhythms provide a functional architecture for cortical activity underpinning cognitive and sensory processing. Attenuation of alpha …
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Inciting anarchy in vigilance research: Addressing the limitations of reductionism
… within a limited time-window; 2) prestimulus alpha power was associated with correct responses to rarelyoccurring trials, irrespective of these trials requiring unique responses; 3) vigilance can function in multiple ways given various task demands, some of which may be robust to performance …
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Lateralization of motor behavior as a measure of cognitive functioning and resting-state electrocortical activity
… performance on finger-tapping tasks (FTT), alpha power during resting-state electroencephalography (EEG), handedness, and relevant psychological outcomes. Methods. A sample of 48 individuals between the ages of 18 and 35 completed online assessments including a modified FTT paradigm, the …
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Optimal network control for big and heavy data delivery
… which solves the above issue by adding alpha power on the queue backlog, has been proposed. Nevertheless, even though maximum weight-alpha scheduling overcomes this existing issue, it still must to decide the value for different kinds of arrival traffic, which is not easy to implement in …
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Sex Differences on a Mental Rotation Task: Variations in Hemispheric Activation Between Children and College Students
… and girls. After covarying for baseline EEG high alpha power values, EEG results during the mental rotation task indicated an interaction, with men exhibiting more activation (lower EEG power values at 10.5-13.5Hz) than women in the parietal and posterior temporal regions, while boys' and girls' …
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Brain Electrical Activity in Infants of Depressed and Anxious Mothers
… asymmetry in infant offspring. EEG measures of alpha power (4-6 Hz) in the right and left hemisphere were recorded in infants (four to eight months of age) of mothers with a documented history of major depressive disorder (n = 39), anxiety disorder (n = 22), and comparison subjects (n = 38) …
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EEG Features of Working Memory Impairment in Alzheimer’s Dementia and Mild Cognitive Impairment
… with a focus on three EEG features: theta and alpha power, theta-gamma coupling, and theta phase synchronization. We hypothesized that these EEG features would be most impaired in those with AD, while individuals with MCI would present with less significant impairments. Additionally, we …
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A domain-general perspective on medial frontal brain activity during performance monitoring
… elicited similar changes across MFNs and theta power. In the final study, we converted our response cueing paradigm into a saccade cueing task in order to examine the oscillatory dynamics of response preparation. We found that, compared to easy pro-saccades, successfully preparing a difficult …
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Employing Intracranial EEG Data to Decipher Sleep Neural Dynamics
… (REM) sleep. We identified differences in alpha power between wake and REM sleep to develop a methodological way to reliably differentiate between wake and REM sleep states. We also wanted to investigate the neural dynamics involved with a particular brainwave seen during sleep, the sleep …
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