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 12 of 12 for “"event-related fMRI"”.
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Extracting Feature Vectors From Event-Related fMRI Data to Enable Machine Learning Analysis
… the dominant means of extracting summaries of events in fMRI for feature vector based machine learning. While they are both useful and robust, they are limited by the assumptions made in modeling. In this work, we examine a number of feature extraction techniques adjacent to linear models that …
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Seeking the neural basis of grammar : English noun and verb morphological processing investigated with rapid event-related fMRI and intracortical electrophysiology
(cont.) the functionality of the fMRI data analysis and visualization tools used at Massachusetts General Hospital. I analyze and interpret an 18-subject fMRI experiment I ran using the new task design and software tools. Finally, I present preliminary findings on linguistic questions as well as …
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Neurale Mechanismen "intuitiver" Urteilsprozesse
… perception of coherence, we performed an event-related fMRI study using a semantic judgment task. Participants first had to judge whether three simultaneously presented words were coherent in the sense that they were all weakly related to a common associate or incoherent if they were not. …
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Tip-of-the-tongue States in Aging: Evidence From Behavioral and Neuroimaging Studies
… experiences in older adults. In an event-related fMRI design, participants viewed famous and novel faces and were asked to respond regarding successful retrieval, unsuccessful retrieval, or tip-of-the-tongue experiences. Results show that, as a group, older adults had activation in …
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Investigating neural correlates of stimulus repetition using fMRI
… memory. Functional magnetic resonance imaging (fMRI) is a non-invasive way to examine repetition-related effects in the human brain. However the Blood-Oxygenation Level-Dependent (BOLD) signal measured by fMRI is far removed from the electrical activity recorded from single cells in animal …
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The inefficiency of open-loop fMRI experiments
… roles are not well understood. Until recently, event related fMRI experiments used to study the DMN could only be conducted in an open-loop format. The purpose of this study was to demonstrate the potential statistical advantages of real-time fMRI studies to conduct closed-loop experiments to …
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The Effects of Fitness Differences and Fitness Training on Dual-Task Performance and the Brain Processes of Older Adults
Age-related declines in brain structure and function have been well documented. For this reason, it is imperative to develop methods to offset the decline and improve cortical and cognitive function. Physical activity has emerged as one way to improve cognitive function and enhance brain activity …
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Processing of quantitative information, investigated with fMRI.
… quantities also activate the neuron. Recent fMRI studies also confirmed the existence of a number-selective system in humans. Several computational modelling studies predicted a number-sensitive coding stage as a necessary preceding stage to the number-selective neurons (Verguts & Fias, …
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Neuroimaging and behavioral investigation of declarative memory in South African children prenatally exposed to alcohol
… design functional magnetic resonance imaging (fMRI) paradigm to investigate neural activation during visual perception, a lower-order cognitive process essential to memory encoding. The task elicited bilateral category-specific activation during the visual perception of objects and scenes in …
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Wortformen und Konzepte im mentalen Lexikon : eine fMRT-Studie zur Einzelwortverarbeitung bei Sprachgesunden sowie zur Rückbildung nach Aphasie
… aphasia after a left hemisphere lesion. In an event-related fMRI study 15 healthy young men and one patient were scanned during visual language tasks. The first task focussing on word form knowledge required finding a homonym with each meaning related to one of the two given stimuli. In the …
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Hierarchical organisation of voice and voice gender perception
… the recognition of speech, affect and identity related information. Furthermore, this model suggested potential interactions with face perception pathways. In this thesis, I investigated two different stages of this voice perception model. First, little is known about the speed at which the …
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Dissecting the human medial temporal lobe memory system by functional MRI
The work presented in this thesis comprises two event-related functional magnetic resonance imaging (fMRI) studies, which aim at dissociating the contributions of different subregions of the human medial temporal lobe (MTL) to declarative memory processes. The first study examines common neural …