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 16 of 16 for “"BOLD Response"”.
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The negative BOLD response as a marker of the seizure onset zone
… relation to SOZ localization, and the negative response was ignored. It has been suggested that both positive and negative activation maps should be considered, and the maximal cluster of these two maps, regardless of polarity, should be used to localize the SOZ. In the second study, the concept …
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Activation of the corticolimbic brain by visual food cues; Effect of menstrual cycle phase and mood
… main study objectives were: 1) to compare the BOLD response between the peri-ovulatory and luteal phases of the menstrual cycle and 2) to compare the BOLD response between women in a negative and positive affect state in response to visual food stimuli using functional magnetic resonance …
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Improving Executive Functioning in Children with Fetal Alcohol Spectrum Disorders using the Alert Program for Self Regulation®
… also observed as the TXT group showed increased BOLD response in the right prefrontal cortex (PFC) and left caudate on a task of inhibitory control. When treatment responders were compared to nonresponders a pattern of increased BOLD response was found bilaterally in the PFC and left caudate. …
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Cognitive and neural correlates of memory retrieval in young and older adults
… Young adults exhibited repetition-related BOLD response reductions in LIPC that were specific to the particular semantic task engaged, consistent with the hypothesis that LIPC supports controlled semantic retrieval. Older adults, in contrast, exhibited repetition-related signal reductions …
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The effects of caffeine and caffeine withdrawal on measures of mood, cognition, and functional magnetic resonance imaging
… withdrawal on the blood oxygen level dependent (BOLD) signal were investigated using functional imaging. Since the effects of caffeine on the traditional measure of the BOLD response have been inconsistent, time course parameters were extracted in an attempt to separate neural and vascular …
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Biomechanical and Neural Factors Associated with Gait Dysfunction and Freezing in People with Parkinson Disease
… measured via blood oxygen level dependent [BOLD] signal) in those with PD compared to healthy adults. We found that during complex gait tasks, those with PD activated the supplementary motor area more than healthy adults. In addition, we observed reduced activity in the globus pallidus in …
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Neural mechanisms of attention to motion
… account the effect of attention: contrast gain, response gain and baseline shift. However, psychophysical and neuroimaging studies produced results that are not always consistent. We used the functional magnetic resonance imaging (fMRI) to explore how attention alters the appearance of coherently …
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Inhibitory Control Changes in Healthy Aging, Alzheimer’s Disease and Amnestic Mild Cognitive Impairment: An FMRI Study of the Stroop Task
… is required to suppress the automatic reading response in order to identify the ink color of word stimuli with matching (congruent) or non-matching (incongruent) ink color. Whether differences exist behaviorally, or if compensatory brain mechanisms to maintain task performance occur across …
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An fMRI and TMS investigation of response, semantic, and task conflict in the Stroop task.
… stream (i.e., at the task, semantic, and response level). An enduring goal of research investigating attentional control is to establish the point in the processing stream at which information can be selected or ignored, and in turn establish whether dissociable neural networks underpin …
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Biophysical modeling of hemodynamic-based neuroimaging techniques
… limits our ability to recover the hemodynamic response without averaging tens of trials. Developing a new methodology to clean the NIRS signal from systemic interference and isolate the cortical signal would therefore significantly increase our ability to recover the hemodynamic response …
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Dynamic Magnetic Resonance Imaging for Tumor Prognosis
… development of MRI the non-invasive technique, BOLD (Blood Oxygenation Level Dependent) contrast MRI, has been widely used for neuroscience research to detect brain activations. Because deoxyhemoglobin (dHbO2) is paramagnetic and oxyhemoglobin (HbO2) is non-magnetic, the change of concentration …
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Identifying the Seizure Onset Zone using Intracranial EEG-fMRI
… into changes in blood oxygen-level dependent (BOLD) responses associated with interictal epileptiform discharges (IEDs). However, the concordance level between SOZ and IED-related BOLD clusters has not been quantitatively investigated for different brain structures. This thesis aims to identify …
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Full Brain Blood-Oxygen-Level-Dependent Signal Parameter Estimation Using Particle Filters
… predict the Blood-Oxygen-Level-Dependent signal response, more model constraints are needed to uniquely identify a single set of parameters. This illposed nature explains the large discrepancies found in other research that attempted to characterize the model parameters. For this reason the final …
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Blood-Oxygen-Level-Dependent Parameter Identification using Multimodal Neuroimaging and Particle Filters
The Blood Oxygen Level Dependent (BOLD) signal provides indirect estimates of neural activity. The parameters of this BOLD signal can give information about the pathophysiological state of the brain. Most of the models for the BOLD signal are overparameterized which makes the unique identification …
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Towards sustainability in South Africa : a study of local government sustainability planning in the Cape Metropolitan Area
… doing to elevate its citizens quality of life. A bold response to local sustainability planning is required if this is to be achieved.
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Development of diffusive optical imaging as a tool for studying the neurobiology of birdsong
… prototyping technology and applied it to record responses to presentations of birdsong in isoflurane-anesthetized zebra finches. We discovered a subtle but significant difference between the hemoglobin spectra of zebra finches and mammals which has a major impact in how hemodynamic responses are …