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 20 for “"Intracranial EEG"”.
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Identifying the Seizure Onset Zone using Intracranial EEG-fMRI
Simultaneous EEG-fMRI has been an effective technique for identification of the seizure onset zone (SOZ) in patients with refractory epilepsy. Recent studies have shown that using intracranial electrodes (iEEG) combined with fMRI offers unique insight into changes in blood oxygen-level dependent …
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Employing Intracranial EEG Data to Decipher Sleep Neural Dynamics
… that involve changes in brainwave patterns. Intracranial EEG (iEEG) is an invasive brain recording technique used in hospital settings in epileptic patients to determine the focus of their seizure activity. The intracranial data recorded allows one to directly observe the neural activity of …
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Investigation of Sleep Neural Dynamics in Intracranial EEG Patients
Intracranial electroencephalography (iEEG) provides superior diagnostic and research benefits over non-invasive EEG in terms of spatial resolution and the level of electrophysiological detail. Post-operative Computed Tomography (CT) scans provide the precision in electrode localization required for …
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Automatic detection of epileptic seizure onset and termination using intracranial EEG
… of real-time epileptic seizure detection from intracranial EEG (IEEG). One difficulty in creating an approach that can be used for many patients is the heterogeneity of seizure IEEG patterns across different patients and even within a patient. In addition, simultaneously maximizing sensitivity …
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Alpha thalamocortical networks during propofol general anesthesia and disorders of consciousness
… 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 power has been linked to clinical …
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The Interictal State In Epilepsy And Behavior
… reviewers in marking interictal spikes on intracranial EEG, and then develop and test an automated detection method to solve this problem. Next, we use this automated detection algorithm to identify spikes on intracranial EEG in both tumor and non-tumor patients in order to determine the …
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Analyzing and Classifying Neural Dynamics from Intracranial Electroencephalography Signals in Brain-Computer Interface Applications
… currently used in electroencephalographic (EEG) signal classification and assess their performance on intracranial EEG (iEEG) data. We first discuss the motor imagery task employed using iEEG signals and find features that clearly distinguish between different classes. Second, we compare the …
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Neural dynamics supporting flexible cognition
… goals. In the following investigations, we use intracranial EEG (iEEG) recordings in humans to study the neural dynamics of flexible cognition during high-order sensory processing. First, we validated assumptions about the locality of iEEG signals and clarified how electrode type, referencing …
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Spatiotemporal Dynamics of Neural Activity During Human Episodic Memory Encoding and Retrieval
… and a particularly powerful neuroimaging tool (intracranial EEG), I document the changes that occur in the brain as episodic memories are first formed and then later retrieved. I find that the episodic memory system is best conceptualized as stage-wise process consisting of distinct brain …
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Electrophysiological Signatures of Spatial and Temporal Coding in Humans
… a brief summary of scalp electroencephalogram (EEG), intracranial EEG, mobile EEG, hippocampal theta oscillations, frontal midline theta oscillations, and behavioral models for spatial and temporal cognition. In Chapter 2, I report the feasibility of recording navigation-related frontal-midline …
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Time-resolved Resting-state fMRI of Brain States Associated with Drug-resistant Epilepsy
… underwent simultaneous resting-state fMRI and intracranial EEG (iEEG), with a focus on the DMN and its interaction with five other major networks. The relationship between the occurrences of iEEG-recorded interictal epileptiform discharges (IEDs) and occupied brain state is examined to better …
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FMRI In Patients With Implanted Electrodes: Mitigating Imaging Artifacts
This thesis explores the integration of intracranial EEG (icEEG) with functional MRI (fMRI) in epilepsy patients with implanted electrodes, aiming to mitigate susceptibility artifacts in the resulting fMRI images and thus enhance diagnostic accuracy. Epilepsy is a complex disorder requiring precise …
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Computational Approaches To Epilepsy: Graph Networks For Localization And Multi-Model Approach For Prediction
… based on the retrospective analysis of intracranial EEG (iEEG) recordings. First, this thesis establishes a generalizable, biomarker-driven framework for identifying the SoZ. It demonstrates that epileptic networks possess common, population-level signatures. By leveraging effective …
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Reinforcement Learning Describes the Computational and Neural Processes Underlying Flexible Learning of Values and Attentional Selection
… mechanisms in the brain benefit from using 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 …
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Network Dynamics of Visual Object Recognition
… human neuroimaging techniques (e.g. fMRI, scalp EEG). To better understand these issues, we leveraged the high spatiotemporal resolution of intracranial EEG (icEEG) recordings to study rapid, transient interactions between the disseminated cortical substrates within category-specific networks. …
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Investigation of High Frequency Oscillations in Epilepsy Using Computational Intelligence
… detained visual examination of long-term intracranial EEG recordings. The clinical utility of HFOs has been hampered due to the challenges associated with the quantitative identification of HFOs in massive-volume iEEG datasets. The lack of established criteria for distinguishing …
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Investigating The Neural Basis of Audiovisual Speech Perception With Intracranial Recordings In Humans
… from the brain surfaces of human subjects using intracranial electrodes, a technique known as electrocorticography (ECoG). First, I studied responses to noisy speech in the auditory cortex, specifically in the superior temporal gyrus (STG). Previous studies identified the anterior parts of the …
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Neural processing of semantic content in movies
… To address this question I analyzed simultaneous intracranial and eyetracking data from over 6,000 electrodes across 23 patients with intractable epilepsy. Responses to fast eye movements – saccades – and film cuts are widespread across the entire brain, while responses to motion are restricted to …
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Organizace funkčních oblastí mozku u epileptochirurgických pacientů
… ABSTRAKT Intrakraniální elektroencefalografie (iEEG) je jednou z vyšetřovacích metod v rámci přípravy kandidátů chirurgické léčby epilepsie. Tato unikátní metoda měření mozkové aktivity představuje vzhledem ke své vysoké prostorové specificitě, kvalitnímu signálu a vysokému časovému rozlišení …