نتایج جستجو برای: سیگنال bold

تعداد نتایج: 16895  

2011
Swetha Dravida Marina Bedny Rebecca Saxe

On some accounts, word-meanings are organized in the human-brain according to their sensory-motor attributes. We tested an alternative hypothesis: word-meanings are neuroanatomically dissociable along abstract conceptual dimensions (entities vs. events). We measured brain activity in the left middle temporal gyrus (lMTG), a brain region that has previously been shown to respond more to verbs th...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2012
Cesare Magri Ulrich Schridde Yusuke Murayama Stefano Panzeri Nikos K Logothetis

There is growing evidence that several components of the mass neural activity contributing to the local field potential (LFP) can be partly separated by decomposing the LFP into nonoverlapping frequency bands. Although the blood oxygen level-dependent (BOLD) signal has been found to correlate preferentially with specific frequency bands of the LFP, it is still unclear whether the BOLD signal re...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2016
Catherine N Hall Clare Howarth Zebulun Kurth-Nelson Anusha Mishra

Cognitive neuroscience depends on the use of blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) to probe brain function. Although commonly used as a surrogate measure of neuronal activity, BOLD signals actually reflect changes in brain blood oxygenation. Understanding the mechanisms linking neuronal activity to vascular perfusion is, therefore, critical in int...

Journal: :Bulletin of mathematical biology 2011
Roberto C Sotero Yasser Iturria-Medina

A theoretical framework is presented for converting Blood Oxygenation Level Dependent (BOLD) images to brain temperature maps, based on the idea that disproportional local changes in cerebral blood flow (CBF) as compared with cerebral metabolic rate of oxygen consumption (CMRO₂) during functional brain activity, lead to both brain temperature changes and the BOLD effect. Using an oxygen limitat...

Journal: :Journal of neurophysiology 2008
Mark McAvoy Linda Larson-Prior Tracy S Nolan S Neil Vaishnavi Marcus E Raichle Giovanni d'Avossa

The brain exhibits spontaneous neural activity that depends on the behavioral state of the organism. We asked whether the blood oxygenation level-dependent (BOLD) signal reflects these modulations. BOLD was measured under three steady-state conditions: while subjects kept their eyes closed, kept their eyes open, or while fixating. The BOLD spectral density was calculated across brain voxels and...

Journal: :Magnetic resonance imaging 2010
Cheryl A Olman Pierre-Francois Van de Moortele Jennifer F Schumacher Joseph R Guy Kâmil Uğurbil Essa Yacoub

For blood oxygenation level-dependent (BOLD) functional MRI experiments, contrast-to-noise ratio (CNR) increases with increasing field strength for both gradient echo (GE) and spin echo (SE) BOLD techniques. However, susceptibility artifacts and nonuniform coil sensitivity profiles complicate large field-of-view fMRI experiments (e.g., experiments covering multiple visual areas instead of focus...

Journal: :NeuroImage 2014
Laurentius Huber Jozien B. M. Goense Aneurin J. Kennerley Dimo Ivanov Steffen N. Krieger Jöran Lepsien Robert Trampel Robert Turner Harald E. Möller

Decreases in stimulus-dependent blood oxygenation level dependent (BOLD) signal and their underlying neurovascular origins have recently gained considerable interest. In this study a multi-echo, BOLD-corrected vascular space occupancy (VASO) functional magnetic resonance imaging (fMRI) technique was used to investigate neurovascular responses during stimuli that elicit positive and negative BOL...

Journal: :F1000Research 2022

Background: To date, coronavirus diseases 2019 (COVID-19) has no definitive treatment. Thrombosis and hypercoagulation may occur in the advanced stage. Further study on how to use anticoagulants is still required promote best prognosis. Methods: A cross-sectional of 110...

Journal: :Open research Europe 2022

Background: Achieving the United Nations Sustainable Development Goals (SDGs) is beyond capacity of any single organisation. The model for Responsible Research and Innovation (RRI) includes principles engaging stakeholders suggests that an engaged, multi-sectoral approach hold promise to mobilise humanity solve complex urgent global issues.</ns4:...

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