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Functional near-infrared spectroscopy

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https://www.readbyqxmd.com/read/29784971/normalized-spatial-complexity-analysis-of-neural-signals
#1
Huibin Jia, Yanwei Li, Dongchuan Yu
The spatial complexity of neural signals, which was traditionally quantified by omega complexity, varies inversely with the global functional connectivity level across distinct region-of-interests, thus provides a novel approach in functional connectivity analysis. However, the measures in omega complexity are sensitive to the number of neural time-series. Here, normalized spatial complexity was suggested to overcome the above limitation, and was verified by the functional near-infrared spectroscopy (fNIRS) data from a previous published autism spectrum disorder (ASD) research...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29771819/sharing-as-a-model-for-understanding-division
#2
Alexa Ellis, Xiaosu Hu, Craig E Smith, Pamela E Davis-Kean, Ioulia Kovelman
Emerging research suggests that children's ability to divide is the best predictor of later arithmetic development. Although division is typically taught around grade 3, children much younger than this practice division when sharing and allocating resources (e.g. sharing food). To test the hypothesis that social sharing abilities are linked to the emergence of complex numerical division abilities, we examined sharing and division abilities in adults and children. The first study used functional near infrared spectroscopy to examine the neurocognitive bases of division in adults (N=28; age range: 18-23 years) during a task that evaluated their judgment of proportions in the context of sharing, as well as traditional numerical division tasks...
May 16, 2018: Neuroreport
https://www.readbyqxmd.com/read/29767210/low-threshold-lasing-from-colloidal-cdse-cdsete-core-alloyed-crown-type-ii-heteronanoplatelets
#3
Yuan Gao, Mingjie Li, Savas Delikanli, Haiyang Zheng, Baiquan Liu, Cuong Dang, Tze Chien Sum, Hilmi Volkan Demir
Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning range from the visible to near-infrared region. Amplified spontaneous emission (ASE) was achieved from colloidal type-II core/shell nanocrystals several years ago. However, due to the limited charge-transfer (CT) interfacial states and minimal overlap of electron and hole wave functions, the ASE threshold has still been very high...
May 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29766685/test-retest-reliability-of-brain-mitochondrial-cytochrome-c-oxidase-assessed-by-functional-near-infrared-spectroscopy
#4
Lisa Holper, J John Mann
Functional near-infrared spectroscopy (fNIRS) is a noninvasive method for measuring in vivo both hemodynamic and mitochondrial metabolic activities in brain cortical structures. Although the test-retest reliability of the hemodynamic measures, such as reflected by oxygenated (HbO2), deoxygenated (HHb) hemoglobin, and the tissue oxygenation index (TOI), has been previously reported to be good to excellent, the reliability of the metabolic signal indexed by oxidized cytochrome-c-oxidase (oxCCO) has not been reported...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29760966/fast-localization-method-of-an-anomaly-in-tissue-based-on-differential-optical-density
#5
Huiquan Wang, Lina Ren, Zhe Zhao, Jinhai Wang, Hongli Chen
The position of the source-detector (S-D) relative to an anomaly has an important influence on the detection effect in non-invasive near-infrared spectroscopy-based methods. In this study, a single-source multi-detector structure was designed in order to realize the rapid localization of anomalies within tissue. This method uses finite element analysis of the optical density distribution for different horizontal positions, depths and diameters of anomalies. The difference in optical density between the detectors was then calculated...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29757424/continuous-monitoring-of-kidney-transplant-perfusion-with-near-infrared-spectroscopy
#6
Georgia Malakasioti, Stephen D Marks, Tom Watson, Fariba Williams, Mariesa Taylor-Allkins, Nizam Mamode, Justin Morgan, Wesley N Hayes
Background: Current reliance on clinical, laboratory and Doppler ultrasound (DUS) parameters for monitoring kidney transplant perfusion in the immediate post-operative period in children risks late recognition of allograft hypoperfusion and vascular complications. Near-infrared spectroscopy (NIRS) is a real-time, non-invasive technique for monitoring tissue oxygenation percutaneously. NIRS monitoring of kidney transplant perfusion has not previously been validated to the gold standard of DUS...
May 11, 2018: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29752969/optical-mapping-of-prefrontal-brain-connectivity-and-activation-during-emotion-anticipation
#7
Meng-Yun Wang, Feng-Mei Lu, Zhishan Hu, Juan Zhang, Zhen Yuan
Accumulated neuroimaging evidence shows that the dorsal lateral prefrontal cortex (dlPFC) is activated during emotion anticipation. The aim of this work is to examine the brain connectivity and activation differences in dlPFC between the positive, neutral and negative emotion anticipation by using functional near-infrared spectroscopy (fNIRS). The hemodynamic responses were first assessed for all subjects during the performance of various emotion anticipation tasks. And then small-world analysis was performed, in which the small-world network indicators including the clustering coefficient, average path length, average node degree, and measure of small-world index were calculated for the functional brain networks associated with the positive, neutral and negative emotion anticipation, respectively...
May 9, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29751038/magnetic-guanidinylated-chitosan-nanobiocomposite-a-green-catalyst-for-the-synthesis-of-1-4-dihydropyridines
#8
Ali Maleki, Razieh Firouzi-Haji, Zoleikha Hajizadeh
In this study, a novel magnetic guanidinylated chitosan nanobiocomposite was synthesized and characterized by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis (CHN), thermogravimetric analysis (TGA), X-ray diffraction (XRD) pattern, energy dispersive X-ray (EDX) analysis, vibrating sample magnetometer (VSM) curves, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. SEM and TEM images of the nanobiocomposite showed its nearly spherical shape and uniform size distribution with an average size of about 42 nm...
May 8, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29745536/-design-and-experiment-of-a-multi-modal-electroencephalogram-near-infrared-spectroscopy-helmet-for-simultaneously-acquiring-at-the-same-brain-area
#9
Xin Xiong, Yunfa Fu, Xiabing Zhang, Song Li, Baolei Xu, Xuxian Yin
Multi-modal brain-computer interface and multi-modal brain function imaging are developing trends for the present and future. Aiming at multi-modal brain-computer interface based on electroencephalogram-near infrared spectroscopy (EEG-NIRS) and in order to simultaneously acquire the brain activity of motor area, an acquisition helmet by NIRS combined with EEG was designed and verified by the experiment. According to the 10-20 system or 10-20 extended system, the diameter and spacing of NIRS probe and EEG electrode, NIRS probes were aligned with C3 and C4 as the reference electrodes, and NIRS probes were placed in the middle position between EEG electrodes to simultaneously measure variations of NIRS and the corresponding variation of EEG in the same functional brain area...
April 1, 2018: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29740266/improvement-of-olfactory-function-with-high-frequency-non-invasive-auricular-electrostimulation-in-healthy-humans
#10
Ashim Maharjan, Eunice Wang, Mei Peng, Yusuf O Cakmak
In past literature on animal models, invasive vagal nerve stimulation using high frequencies has shown to be effective at modulating the activity of the olfactory bulb (OB). Recent advances in invasive vagal nerve stimulation in humans, despite previous findings in animal models, used low frequency stimulation and found no effect on the olfactory functioning. The present article aimed to test potential effects of non-invasive, high and low frequency vagal nerve stimulation in humans, with supplementary exploration of the orbitofrontal cortex using near-infrared spectroscopy (NIRS)...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29734383/eyes-closed-hybrid-brain-computer-interface-employing-frontal-brain-activation
#11
Jaeyoung Shin, Klaus-Robert Müller, Han-Jeong Hwang
Brain-computer interfaces (BCIs) have been studied extensively in order to establish a non-muscular communication channel mainly for patients with impaired motor functions. However, many limitations remain for BCIs in clinical use. In this study, we propose a hybrid BCI that is based on only frontal brain areas and can be operated in an eyes-closed state for end users with impaired motor and declining visual functions. In our experiment, electroencephalography (EEG) and near-infrared spectroscopy (NIRS) were simultaneously measured while 12 participants performed mental arithmetic (MA) and remained relaxed (baseline state: BL)...
2018: PloS One
https://www.readbyqxmd.com/read/29733408/a-functional-near-infrared-spectroscopy-fnirs-replication-of-the-sunscreen-persuasion-paradigm
#12
Shannon M Burns, Lianne Barnes, Perri L Katzman, Daniel L Ames, Emily B Falk, Matthew D Lieberman
Activity in medial prefrontal cortex (mPFC) during persuasive messages predicts future message-consistent behavior change, but there are significant limitations to the types of persuasion processes that can be invoked inside an MRI scanner. For instance, real world persuasion often involves multiple people in conversation. Functional near infrared spectroscopy (fNIRS) allows us to move out of the scanner and into more ecologically valid contexts. As a first step, the current study used fNIRS to replicate an existing fMRI persuasion paradigm (i...
May 4, 2018: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29721510/evaluation-of-skeletal-muscle-function-and-effects-of-early-rehabilitation-during-acute-heart-failure-rationale-and-study-design
#13
Kinga Węgrzynowska-Teodorczyk, Agnieszka Siennicka, Krystian Josiak, Robert Zymliński, Monika Kasztura, Waldemar Banasiak, Piotr Ponikowski, Marek Woźniewski
Background: Acute heart failure (AHF) is associated with disturbances of the peripheral perfusion leading to the dysfunction of many organs. Consequently, an episode of AHF constitutes a "multiple organ failure" which may also affect the skeletal muscles. However, the abnormalities within skeletal muscles during AHF have not been investigated so far. The aim of this project is to comprehensively evaluate skeletal muscles (at a functional and tissue level) during AHF. Methods: The study will include ≥63 consecutive AHF patients who will be randomized into 2 groups: ≥42 with cardiac rehabilitation group versus ≥21 with standard pharmacotherapy alone...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29720935/brain-oscillatory-and-hemodynamic-activity-in-a-bimanual-coordination-task-following-transcranial-alternating-current-stimulation-tacs-a-combined-eeg-fnirs-study
#14
Alisa Berger, Nils H Pixa, Fabian Steinberg, Michael Doppelmayr
Motor control is associated with synchronized oscillatory activity at alpha (8-12 Hz) and beta (12-30 Hz) frequencies in a cerebello-thalamo-cortical network. Previous studies demonstrated that transcranial alternating current stimulation (tACS) is capable of entraining ongoing oscillatory activity while also modulating motor control. However, the modulatory effects of tACS on both motor control and its underlying electro- and neurophysiological mechanisms remain ambiguous. Thus, the purpose of this study was to contribute to gathering neurophysiological knowledge regarding tACS effects by investigating the after-effects of 10 Hz tACS and 20 Hz tACS at parietal brain areas on bimanual coordination and its concurrent oscillatory and hemodynamic activity...
2018: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29719398/comparison-of-changes-in-oxygenated-hemoglobin-during-the-tree-drawing-task-between-patients-with-schizophrenia-and-healthy-controls
#15
Shinya Nakano, Yoshihisa Shoji, Kiichiro Morita, Hiroyasu Igimi, Mamoru Sato, Youhei Ishii, Akihiko Kondo, Naohisa Uchimura
Background: Tree-drawing test is used as a projective psychological test that expresses the abnormal internal experience in patients with schizophrenia (SZ). Despite the widely accepted view that the cognitive function is involved in characteristic tree-drawing in patients with SZ, no study has psychophysiologically examined it. The present study aimed to investigate the involvement of cognitive function during tree-drawing in patients with SZ. For that purpose, we evaluated the brain function in patients with SZ during a tree-drawing task by using near-infrared spectroscopy (NIRS) and compared them with those in healthy controls...
2018: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/29713685/multi-watt-multi-octave-mid-infrared-femtosecond-source
#16
Marcus Seidel, Xiao Xiao, Syed A Hussain, Gunnar Arisholm, Alexander Hartung, Kevin T Zawilski, Peter G Schunemann, Florian Habel, Michael Trubetskov, Vladimir Pervak, Oleg Pronin, Ferenc Krausz
Spectroscopy in the wavelength range from 2 to 11 μm (900 to 5000 cm-1 ) implies a multitude of applications in fundamental physics, chemistry, as well as environmental and life sciences. The related vibrational transitions, which all infrared-active small molecules, the most common functional groups, as well as biomolecules like proteins, lipids, nucleic acids, and carbohydrates exhibit, reveal information about molecular structure and composition. However, light sources and detectors in the mid-infrared have been inferior to those in the visible or near-infrared, in terms of power, bandwidth, and sensitivity, severely limiting the performance of infrared experimental techniques...
April 2018: Science Advances
https://www.readbyqxmd.com/read/29705065/anticipation-of-a-mentally-effortful-task-recruits-dorsolateral-prefrontal-cortex-an-fnirs-validation-study
#17
Eliana Vassena, Robin Gerrits, Jelle Demanet, Tom Verguts, Roma Siugzdaite
Preparing for a mentally demanding task calls upon cognitive and motivational resources. The underlying neural implementation of these mechanisms is receiving growing attention because of its implications for professional, social, and medical contexts. While several fMRI studies converge in assigning a crucial role to a cortico-subcortical network including Anterior Cigulate Cortex (ACC) and striatum, the involvement of Dorsolateral Prefrontal Cortex (DLPFC) during mental effort anticipation has yet to be replicated...
April 26, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29700232/3-4-dihydroxyphenylacetaldehyde-dopal-induced-protein-modifications-and-their-mitigation-by-n-acetylcysteine
#18
Yunden Jinsmaa, Yehonatan Sharabi, Patti Sullivan, Risa Isonaka, David S Goldstein
The catecholaldehyde hypothesis posits that 3,4-dihydroxyphenylacetaldehyde (DOPAL), an obligate intermediary metabolite of dopamine (DA), is an autotoxin that challenges neuronal homeostasis in catecholaminergic neurons. DOPAL toxicity may involve protein modifications, such as oligomerization of alpha-synuclein (AS). Potential interactions between DOPAL and other proteins related to catecholaminergic neurodegeneration, however, have not been systemically explored. This study examined DOPAL-induced protein-quinone adduct formation ("quinonization") and protein oligomerization, ubiquitination, and aggregation in cultured MO3...
April 26, 2018: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29695729/cerebral-oxygen-saturation-and-peripheral-perfusion-in-the-extremely-premature-infant-with-intraventricular-and-or-pulmonary-haemorrhage-early-in-life
#19
Thierry P Beausoleil, Marie Janaillac, Keith J Barrington, Anie Lapointe, Mathieu Dehaes
Extremely preterm infants are at higher risk of pulmonary (PH) and intraventricular (IVH) haemorrhage during the transitioning physiology due to immature cardiovascular system. Monitoring of haemodynamics can detect early abnormal circulation that may lead to these complications. We described time-frequency relationships between near infrared spectroscopy (NIRS) cerebral regional haemoglobin oxygen saturation (CrSO2 ) and preductal peripheral perfusion index (PI), capillary oxygen saturation (SpO2 ) and heart rate (HR) in extremely preterm infants in the first 72 h of life...
April 25, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29695123/different-hemodynamic-responses-of-the-primary-motor-cortex-accompanying-eccentric-and-concentric-movements-a-functional-nirs-study
#20
Lénaic Borot, Grégoire Vergotte, Stéphane Perrey
The literature contains limited evidence on how our brains control eccentric movement. A higher activation is expected in the contralateral motor cortex (M1) but consensus has not yet been reached. Therefore, the present study aimed to compare patterns of M1 activation between eccentric and concentric movements. Nine healthy participants performed in a randomized order three sets of five repetitions of eccentric or concentric movement with the dominant elbow flexors over a range of motion of 60° at two velocities (30°/s and 60°/s)...
April 24, 2018: Brain Sciences
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