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 805 for “"MEG"”.
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State-space modeling of MEG time series
Magnetoencephalography (MEG) non-invasively offers information about neural activity in the brain by measuring its magnetic field. Estimating the cerebral sources of neural activity from MEG is an ill-posed inverse problem that presents several challenges. First, this inverse problem is …
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A MEG investigation of lexical access in aphasia
… cortical activation. Magnetoencephalography (MEG) was used to measure the cortical activity of 7 people with aphasia, 9 age-matched control participants, and 10 younger control participants as they completed an auditory lexical decision task and a passive listening task with phonemes. In the …
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A finite difference forward model for MEG and EEG
In this thesis, I designed and implemented a model of the electromagnetic signals generated by the human brain as seen on magnetoencephalography and electroencephalography machines. The model makes a novel use of the principle of reciprocity combined with Ohm's Law and the Biot Savart Law to build …
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From representation to recognition : MEG studies of face perception
… must solve. Here I used magnetoencephalography (MEG) in an effort to characterize the sequence of cognitive and neural processes underlying this remarkable ability. This work is designed to answer several questions. First, how long does it take for the human visual system to recognize a stimulus …
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MEG coherence imaging in dyslexia: Activation of working memory pathways
… dyslexics by means of magnetoenchephalographic (MEG) coherence imaging. Dyslexics showed an early onset of activation in the precentral gyrus and the superior frontal gyrus, which differed from controls where activation was initiated in posterior cortical regions (supramarginal gyrus and superior …
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Source localization of MEG generation using spatio-temporal Kalman filter
The inverse problem for magnetoencephalography (MEG) involves estimating the magnitude and location of sources inside the brain that give rise to the magnetic field recorded on the scalp as subjects execute cognitive, motor and/or sensory tasks. Given a forward model which describes how the signals …
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Setting location priors using beamforming improves model comparison in MEG-DCM
… experimental tasks. Magnetoencephalography (MEG) allows for the observation of the fast neuronal dynamics necessary to characterize the activity of sources and their interactions. A network representation of these sources and their connections can be formed by mapping them to nodes and their …
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DTI and MEG Imaging of Subconcussive Impacts in High School Football Players
Football has the highest concussion rate of any competitive contact sport. High school aged males visit the emergency department for concussions caused by football more often than any other cause. While proper identification, diagnosis, and management of concussions in the emergency department can …
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The Dissociation of Location and Object Working Memory Using Fmri and Meg
… two imaging methods (magnetoencephalography, MEG, and functional magnetic imaging, fMRI). These two techniques provide complimentary results due the high temporal resolution of MEG and the high spatial resolution of fMRI. The use of identical location and object change detection tasks was …
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Multimodal integration of EEG and MEG data using minimum ℓ₂-norm estimates
… (EEG) and magnetoencephalography (MEG) data on the minimum ℓ₂-norm estimates of cortical current densities. We investigated analytically the effect of including EEG recordings in MEG studies versus the addition of new MEG channels. To further confirm these results, clinical datasets …
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Head movements of children in MEG : quantification, effects on source estimation, and compensation
Head movements during MEG recordings in children may lead to inaccurate localization of brain activity. In this thesis, we examined the effects of head movements on source estimation in twenty children performing a simple auditory cognitive task. In addition, we tested the ability of a recently …
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Egy csapatban?!- avagy hogyan valósul meg a sajátos nevelési igényű gyermekek segítése az óvodákban?
Dolgozatom első részében eddigi tapasztalataim alapján bemutatom, hogy milyen társadalmi változások hatására alakult ki a sajátos nevelési igényű gyerekek nevelését, oktatását illetően az inklúzív szemlélet. Az integráció és inklúzió fogalmakat definiálom illetve külön hangsúlyt fektetek a kettő …
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MEG correlates of visual perception : the M170 response to degraded face and building images
… and is measured with magnetoencephalography (MEG). The remainder of this report will focus on what neural step the M170 may reflect. It will include a comprehensive review of past M170 research (preceded by some important facts about MEG), and a new experiment addressing two pivotal questions: …
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Jeg Gikk Meg Over Sjo og Land: A Journey for the Future into the Past
Using Scandinavian immigrant culture as a backdrop, this project presents an integrated multiple intelligences approach to teaching Kindergarten and elementary school students about their music, history, and cultural inheritance. The paper describes eight themes that formed the framework of the …
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Jeg Gikk Meg Over Sjo og Land: A Journey for the Future into the Past
Using Scandinavian immigrant culture as a backdrop, this project presents an integrated multiple intelligences approach to teaching Kindergarten and elementary school students about their music, history, and cultural inheritance. The paper describes eight themes that formed the framework of the …
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Uncovering Dynamic Semantic Networks in the Brain Using Novel Approaches for EEG/MEG Connectome Reconstruction
… Electro-/MagnetoEncephaloGraphy (EEG/MEG) data in order to track dynamic modulations of activity and connectivity within the semantic networks while a concept unfolds in the brain. Moreover, in order to obtain more accurate connectivity estimates of the semantic networks, we propose …
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Analysis of beta-band MEG coherence in ASD during direct gaze processing: Relationship to social cognition
… gaze while undergoing Magnetoencephalography (MEG). Results revealed significant intra- and inter-hemispheric between-group differences in average coherence (1-45 Hz), providing preliminary support for increased long-range left hemisphere coherence and increased interhemisphere …
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Models and algorithms of brain connectivity, spatial sparsity, and temporal dynamics for the MEG/EEG inverse problem
Magnetoencephalography (MEG) and electroencephalography (EEG) are noninvasive functional neuroimaging techniques that provide high temporal resolution recordings of brain activity, offering a unique means to study fast neural dynamics in humans. Localizing the sources of brain activity from MEG/EEG …
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