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.
Results
Showing 1 to 20 of 39 for “"Magnetoencephalography (MEG)"”.
-
Development of Methodologies for the Solution of the Forward Problem in Magnetic-Field Tomography (MFT) Based on Magnetoencephalography (MEG)
… problem in Magnetic field Tomography based on Magnetoencephalography. Throughout the report full aspects of the accurate solution are discussed, including the development of algorithms and methods for realistic brain model, development of realistic neuronal source, computational approaches, and …
-
Phonological and semantic influences on auditory word perception in children with and without reading impairments using magnetoencephalography (MEG) and electroencephalography (EEG)
… The work in this thesis combined behavioral, MEG, and EEG methods to examine how normal and reading-impaired children, 7-13 years of age, perceive speech under varying degrees of phonological contrast (1 vs. 3 phonetic features). In a series of auditory word perception experiments, good and …
-
Characterizing the spatiotemporal profile and the level of abstractness of action representations: neural decoding of magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) data
… three neuroimaging studies in which we used magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) to characterize the temporal dynamics of abstract representations of observed actions (Study 1 and 2), meaning that generalize across lower level dimensions, and to …
-
Multimodal integration of EEG and MEG data using minimum ℓ₂-norm estimates
… integration of electroencephalography (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 …
-
Words and rules in the brain
… tense generation. Two neuroimaging techniques, magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) were used to test healthy, right-handed subjects who were native speakers of English in a past tense production paradigm, in addition to a lexical access study. The …
-
Deep learning models for the perception of human social interactions
… perception with deep learning models and magnetoencephalography (MEG) data. Specically, I implement dierent deep learning computer vision models and test their performance on a social inter- action detection task as well as their match to neural data from the same task. I nd that detecting …
-
Analysis of beta-band MEG coherence in ASD during direct gaze processing: Relationship to social cognition
… passively viewed direct 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 …
-
Gamma oscillatory activity in autism spectrum disorder during a face cueing task
… between neurotypicals and ASD as measured by magnetoencephalography (MEG) while performing a gaze cueing task simulating joint attention. Results support lower frontal gamma power in ASD, suggesting that impaired generation of gamma activity in the prefrontal cortex may be involved in …
-
Spatio-temporal analysis in functional brain imaging
… activity from electroencephalography (EEG) and magnetoencephalography (MEG) measurements involves solving an ill-posed inverse problem, where infinitely many source distribution patterns can give rise to identical measurements. This thesis aims to improve the accuracy of source localization by …
-
Integration and characterization of a control and signal processing system for a SERF magnetometer array
… by applications in a variety of areas, including magnetoencephalography (MEG), magnetic anomaly detection (MAD), dynamic measurements of geomagnetic fields, and MRI signal detection. While numerous architectures are being pursued in the development of high sensitivity magnetometers, optical atomic …
-
Setting location priors using beamforming improves model comparison in MEG-DCM
… activity of the brain during 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 …
-
Fully Hyperbolic Graph Convolutional Neural Networks for Age Prediction with Multi-Modal Brain Data
Characterizing age-related alterations in MEG brain networks holds great promise in understanding aging trajectories and revealing aberrant patterns of neurodegenerative disorders, such as Alzheimer’s disease. In this study, we utilize a Fully Hyperbolic Neural Network (FHNN) to embed functional …
-
Magnetoencephalographic Study on the Representation of Huygens Noise in the Auditory Cortex of Humans
… onset response (POR) was derived by means of magnetoencephalography (MEG). Source analysis revealed the center of this activity in the lateral part of Heschl's Gyrus in the auditory cortex of both hemispheres. The latency of the POR correlated highly with the perceived pitch. When the …
-
A MEG investigation of lexical access in aphasia
… sensitive means of tracking 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 …
-
From representation to recognition : MEG studies of face perception
… our visual system 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 …
-
Memory-related cognitive modulation of human auditory cortex: Magnetoencephalography-based validation of a computational model
… The experimental approach measures high-density magnetoencephalography (MEG) signals from human participants to investigate the modulation of human auditory evoked responses (AER) induced by the overt processing of auditory STM during task performance. To accomplish this goal, a new signal …
-
Developmental Alterations to the Alpha-Beta Neural Oscillations Underlying Verbal Working Memory Function in Children and Adolescents
… is related to cognition in a broader context. Magnetoencephalography (MEG) was utilized to record neural activity from 74 participants aged 7-15 years (61 participants included in final analysis) during a letter-based Sternberg WM paradigm; participants also completed a neuropsychological …
-
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 …
-
Developmental Plasticity of Language Representation in Healthy Subjects and Children with Medically Intractable Epilepsy
… study, a novel verb generation paradigm and magnetoencephalography (MEG) were used to determine the spatial-temporal characteristics of language expression in healthy subjects (n = 12) and children with neurological disorders (n = 4). Time-frequency and differential beamformer analyses …
-
The Dissociation of Location and Object Working Memory Using Fmri and Meg
… and object VWM across 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 …
Page 1 of 2