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Showing 1 to 15 of 15 for “"BOLD fMRI"”.
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Oxygen Polarography in the Awake Macaque: Bridging BOLD fMRI and Electrophysiology
<p>Blood oxygen level dependent (BOLD) fMRI is the predominant method for evaluating human brain activity. This technique identifies brain activity by measuring blood oxygen changes associated with neural activity. Although clearly related, the nature of the relationship between BOLD fMRI …
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Optimizing Transcranial Focused Ultrasound: Calibration, Neuro Navigation, and BOLD fMRI Evidence of Neuromodulation
… brain activity, as indicated by changes in BOLD fMRI signals during and after stimulation. While the study's sample size and focus on a single brain region limit the generalizability of the findings, the research establishes a strong foundation for future studies. These should explore the …
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Simultaneous Integrated Functional Magnetic Resonance Imaging and Optical Tomography in the Near Infrared Spectrum (Sinfonis) for Studying Hemodynamic and Neuronal Responses in the Human Brain
… reasonably good consistency with that of the BOLD fMRI result. It has been discovered from the correspondence between the two results that the change in oxyhemoglobin concentration may also play a secondary role in the BOLD signal. However, this hypothesis needs further systematic studies, …
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Pharmacological and Genetic Effects of Serotonin on Value-Based Decision-Making
… structural (DTI) and functional aspects (BOLD-fMRI) of the brain were assessed using magnetic resonance imaging in relation to decision-making. Overall, we only found limited evidence for a serotonergic effect on decision-making that was restricted to a genetic association with …
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Characterization of mismatch between behavioral stimuli and FRMI data using the Kalman filter
… dependent function magnetic resonance imaging, (BOLD fMRI), allows researchers to non-invasively investigate the functioning human brain. The BOLD fMRI response to brief stimuli is called the hemodynamic response function (HRF), which can vary across brain regions and across subjects. Models of …
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Expanding the role of functional mri in rehabilitation research
Functional magnetic resonance imaging (fMRI) based on blood oxygenation level dependent (BOLD) contrast has become a universal methodology in functional neuroimaging. However, the BOLD signal consists of a mix of physiological parameters and has relatively poor reproducibility. As fMRI becomes a …
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The Effect Of Abstinence From Smoking On Stress Reactivity
… stress. Functional magnetic reasoning imaging (fMRI) could provide a much-needed objective measure of stress reactivity. The goal of this dissertation is to contribute to the understanding of abstinence-induced changes in stress reactivity by examining neural, neuroendocrine (cortisol), and …
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Novel Functional Magnetic Resonance Imaging Analysis Approaches for Investigations of the Dynamics of Resting-State Functional Connectivity
… functional magnetic resonance imaging (BOLD fMRI) signals are highly synchronous between brain regions that serve similar functions. This provides a means to investigate functional networks of the human brain; however, most data analysis techniques assume functional connections are …
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A Novel Experimental Method for Measuring Proactive and Reactive Responses to Threat and an Examination of Their Personality and Neural Correlates
… dependent functional magnetic resonance imaging (BOLD fMRI) was used to measure individual differences in threat-related amygdala reactivity and intrinsic connectivity within the corticolimbic circuit.</p><p>Results from Study 1 demonstrate that during threat exposure, participants exhibit …
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Univariate and Multivariate fMRI Investigations of Delay Discounting and Episodic Future Thinking in Alcohol Use Disorder
… functional magnetic resonance imaging (BOLD fMRI). However, the extent to which these brain activation maps reflect the characteristics of impulsive behavior has not been directly studied. To examine this, we used multi-voxel pattern analysis (MVPA) methods such as multivariate …
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Human brain functional dynamic connectivity: challenges and potentials in health and disease studies
… derived from restingstate functional MRI (rs-fMRI), dynamic or time-varying connectivity (TVC) estimates result from temporal fluctuation correlations of BOLD fMRI time series between brain regions. However, given the novelty of this research line, there are still various challenges involved …
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Strategies for Artifact Correction and Motion Monitoring in MRI Through Innovations in Radiofrequency Coil Design
… is used for blood-oxygenation level-dependent (BOLD) functional MRI (fMRI). This was done through modification of the cost function used in the shim optimization, which typically uses a single term representing the B_0 inhomogeneity, to include a second term representing the signal loss, with an …
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The morphology of the intraparietal sulcus in children prenatally exposed to alcohol in a sample of children from the Western Cape, South Africa and its potential relationship with number processing
… used in the third analysis when looking at the BOLD fMRI data of the participants. For this analysis, the manually traced MIPS and LIPS were subdivided into five ROI's for the left and right hemispheres respectively: (1) the superior MIPS, (2) the medial branch of the MIPS, (3) the inferior …
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Approaches to Understanding the Function of Intrinsic Activity and its Relationship to Task-evoked Activity in the Human Brain
… visual cortex the blood oxygen level dependent (BOLD) signal with fMRI to analyze the multivoxel activity patterns and FC structures of intrinsic activity, and compare them to those evoked by natural and synthetic visual stimuli.</p><p>In chapter 1, we review previous evidence of an association …