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 41 for “"ECoG"”.
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Temporal Dynamics of Endogenous and Stimulus-Driven Attention: Combined ECoG/fMRI Studies
… their seizure foci using electrocorticography (ECoG), electrodes placed directly on the cortical surface. We subsequently recorded cortical physiology from the ECoG electrodes during a spatial attention task, involving both goal-driven and stimulus-driven attention, and co-registered electrode …
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The Use of High-Density ECoG for Functional Mapping and Neural Decoding
… and quality of life. Electrocorticography (ECoG) can map functional areas without delivering electrical current to the cortex by placing electrodes directly onto the cortex. Traditional clinical grid electrodes generally have large inter-electrode distance of 1 cm. The customized …
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Monitoring of cerebellar injury using micro ECoG signals in ketamine/xylazine treated rats
… in ketamine/xylazine treated rats by using micro ECoG signals extracted the baseline information in the cerebellum to investigate the altered electrophysiology in the damaged neural circuitry. The temporal course of excitability change in selected neural networks was used as a method to study …
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ECoG correlates of visuomotor transformation, neural plasticity, and application to a force-based brain computer interface
<p>Electrocorticography: ECoG) has gained increased notoriety over the past decade as a possible recording modality for Brain-Computer Interface: BCI) applications that offers a balance of minimal invasiveness to the patient in addition to robust spectral information over time. More recently, the …
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Electrocorticographic Neural Correlates of Arm Movements and Associated Goal Orientation in Humans
… encoding using subdural electrocorticographic: ECoG) recordings in humans. Using a joystick-based visuomotor task, subjects performed both a standard, delayed match-to-sample center-out task as well as a circular tracing task. Spectral analyses of the ECoG signals clearly showed significant …
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Investigation of the Clinical Utility of the Spatio-Spectral Dynamics of Sensorimotor ECoG in Response to Different Somatosensory Stimulation Modalities in Human Subjects
… achieved with high-density electrocorticogram (ECoG) grids. The recorded neural data interpretation can be achieved with machine learning algorithms. Additionally, we used the unique opportunity to assess sensorimotor rhythms intraoperatively during awake surgery with ECoG. We also investigated …
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Reading Your Own Mind: Dynamic Visualization of Real-Time Neural Signals
… for the specific case of Electrocorticography: ECoG) recordings from clinical epilepsy patients. First, queued patient tasks were used to explore the predictive nature of both local and global features of the ECoG signal. Second, an algorithm was developed and tested for estimating the most …
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Neural Adaptation and the Effect of Interelectrode Spacing on Epidural Electrocorticography for Brain-Computer Interfaces
Electrocorticography: ECoG) is increasingly being identified as a safe and reliable recording technique for both Brain-Computer Interface: BCI) applications as well as neurophysiology studies. This thesis describes some of the first real-time closed-loop BCI studies of chronic ECoG in non-human …
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Multi-Modality Assessment Of Language Function
… employed is task-related electrocorticography (ECoG). This is complemented by discussion and evaluation of previously published functional magnetic resonance imaging (fMRI) data. Language-related structure is explored using diffusion-weighted magnetic resonance imaging in conjunction with ECoG …
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The Role of Low Tone Average in the Diagnosis of Meniere's Disease
… Objective tests, such as electrocochleography (ECoG) exists to aid in the diagnosis; however the tests are not necessarily specific and in many cases require significant skill in performing, as well as interpreting, the results. Audiograms are performed routinely in evaluating a patient with …
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Nonuniform Power Changes and Spatial, Temporal and Spectral Diversity in High Gamma Band (>60 Hz) Signals in Human Electrocorticography
… analyses of electrocorticographic: ECoG) signals, we hypothesized that induced high-gamma band: 60-500Hz) power changes are more heterogeneous than currently understood. We quantified this spectral non-uniformity with two different approaches using single-word repetition tasks in …
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A retrospective cross-sectional analysis of palliative care needs and interventions in patients with cervical cancer in a palliative care unit in Soweto, Johannesburg
… age 60. A proportion of 41.7% of patients had an ECOG Performance status score of 0-1 which meant that they had no to little impact on the performance of daily activities. The majority of patients' performance was significantly impacted (58.3%) by their illness, bearing an ECOG score of 2 2 …
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Study of prognostic markers in advanced cancer
… that CPS (Clinician Predicted Survival), mGPS, ECOG-PS (Eastern Cooperative Oncology Group - Performance Status), dyspnoea, Global Health, cognitive impairment, anorexia, weight loss, LDH, WCC and neutrophil count (NC) predicted survival at 30 days (univariate analysis). CPS, ECOG-PS, mGPS, …
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Phase- and amplitude-coupling are tied by an intrinsic spatial organization but show divergent stimulus-related changes
… cue-based motor task using electrocorticography (ECoG) in 18 patients (8 females) undergoing presurgical monitoring. Significant correspondence between the spatial pattern of PhC and AmpC was detected during stimulus processing across all subjects and frequency bands (R≈0.50 for theta, decreasing …
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Health-Related Quality of Life and Adjustment in Patients with Hepatocellular Carcinoma
… the EORTC and HADS scores after controlling for ECOG and α-FP. Cognitive representations mediated the effects of ECOG on the EORTC and HADS scores, and coping mediated the effects of cognitive representations on psychological aspects of adjustment outcomes. An adjustment model with multiple …
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A comparison of imaging modalities and decoding methods for detecting semantic information in the brain
… compare the capacities of electrocorticography (ECoG) and 7 tesla functional magnetic resonance imaging (7T-fMRI) to detect semantic representations; and (3) to evaluate the strengths and limitations of multivariate analysis methods, in particular methods based on regularised regression, for …
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Outcome and prognostic factors of palliative chemotherapy for non-small cell lung cancer patients at single institution: 2002-2011
… characteristics, 300(74.6%) patients were in the ECOG performance status (PS) 0,1 groups, 31(7.7%) patients were in the ECOG PS 2,3 groups and 71(17.7%) patients had missing values indicating that palliative chemotherapy was mainly performed in groups with good ECOG PS. As for disease stages, …
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"Towards Closed-Loop Sleep Monitoring in Parkinson’s Disease: Self-Supervised Learning Strategies for Sleep Stage Classification"
… strategy, pretrained on large public EEG/ECoG datasets from healthy subjects to learn balanced representations of all sleep stages, thereby improving discrimination of rare classes. While pretraining yielded limited overall improvement, it specifically enhanced N3 stage identification and …
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Low Frequency Biasing
Die Elektrocochleographie (EcoG) ist eine der vielversprechendsten Methoden, cochleäre Dysfunktionen mit objektiver Diagnostik zu verifizieren. Erweitert durch das Prinzip des Biasings, also der gleichzeitigen Präsentation von Testtönen in einen niederfrequenten 52-Hz-Sinusdauerton, läßt sich die …
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Inferring Undirected and Causally Directed Graph Structures from Multivariate Time Series
… monkeys are inferred from Electrocorticographic (ECoG) activity recorded while the animals were alert. The locations of ECoG electrodes are considered as nodes of a graph, the coefficients of the auto-regressive (AR) representation of the signals measured at each node are considered as the signal …
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