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Functional near-infrared spectroscopy

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https://www.readbyqxmd.com/read/28649190/effects-of-light-and-sound-on-the-prefrontal-cortex-activation-and-emotional-function-a-functional-near-infrared-spectroscopy-study
#1
Shota Hori, Koichi Mori, Takehisa Mashimo, Akitoshi Seiyama
We constructed a near infrared spectroscopy-based real-time feedback system to estimate the subjects' emotional states using the changes in oxygenated hemoglobin concentration [Δ(oxy-Hb)] in the prefrontal cortex (PFC). Using this system, we investigated the influences of continual mild and equivocal stimuli consisting of lights and a reconstructed waterfall sound on Δ[oxy-Hb] in the PFC. The visual (light) and auditory (sound) stimuli changed randomly and independently, depending on the emotional states of the individual subjects...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28645025/decreased-functional-connectivity-and-disrupted-neural-network-in-the-prefrontal-cortex-of-affective-disorders-a-resting-state-fnirs-study
#2
Huilin Zhu, Jie Xu, Jiangxue Li, Hongjun Peng, Tingting Cai, Xinge Li, Shijing Wu, Wei Cao, Sailing He
BACKGROUND: Affective disorders (AD) have been conceptualized as neural network-level diseases. In this study, we utilized functional near infrared spectroscopy (fNIRS) to investigate the spontaneous hemodynamic activities in the prefrontal cortex (PFC) of the AD patients with or without medications. METHODS: 42 optical channels were applied to cover the superior frontal gyrus (SFG), middle frontal gyrus (MFG), and inferior frontal gyrus (IFG), which constitute one of the most important affective networks of the brain...
June 17, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28642548/hemodynamics-of-speech-production-an-fnirs-investigation-of-children-who-stutter
#3
B Walsh, F Tian, J A Tourville, M A Yücel, T Kuczek, A J Bostian
Stuttering affects nearly 1% of the population worldwide and often has life-altering negative consequences, including poorer mental health and emotional well-being, and reduced educational and employment achievements. Over two decades of neuroimaging research reveals clear anatomical and physiological differences in the speech neural networks of adults who stutter. However, there have been few neurophysiological investigations of speech production in children who stutter. Using functional near-infrared spectroscopy (fNIRS), we examined hemodynamic responses over neural regions integral to fluent speech production including inferior frontal gyrus, premotor cortex, and superior temporal gyrus during a picture description task...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642340/cardiovascular-and-cerebral-hemodynamics-during-exercise-and-recovery-in-obese-individuals-as-a-function-of-their-fitness-status
#4
Mathieu Gayda, Gabriel Lapierre, Olivier Dupuy, Sarah Fraser, Louis Bherer, Martin Juneau, Vincent Gremeaux, Anil Nigam
The aim of this study was to compare cardiovascular hemodynamics and cerebral oxygenation/perfusion (COP) during and after maximal incremental exercise in obese individuals according to their aerobic fitness versus age-matched healthy controls (AMHC). Fifty-four middle-aged obese (OB) and 16 AMHC were recruited. Maximal cardiopulmonary function (gas exchange analysis), cardiac hemodynamics (impedance cardiography), and left frontal COP (near-infrared spectroscopy: NIRS) were measured continuously during a maximal incremental ergocycle test...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28641441/the-closo-si12c12-molecule-from-cluster-to-crystal-effects-of-hydrogenation-and-oligomerization-on-excited-states
#5
Xiaofeng F Duan, Larry W Burggraf
Excited state properties of chain and cyclic oligomers of closo-Si12C12 moieties are calculated using time-dependent density functional theory methods. Ultraviolet, visible, and near-infrared photo-absorption properties are described for oligomers that form by linking closo-Si12C12 monomer moieties through Si-Si bonds. Natural transition orbitals for electron and hole states of stationary-state excitons in oligomers were compared to understand how exciton states are influenced by oligomer structure. Depending on the structure, some prominent excited states have large electron-hole charge separation while others do not; some exhibit exciton delocalization while others do not...
June 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28636067/dynamic-time-warping-based-averaging-framework-for-functional-near-infrared-spectroscopy-brain-imaging-studies
#6
Li Zhu, Laleh Najafizadeh
No abstract text is available yet for this article.
June 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28635348/hope-coping-skills-and-the-prefrontal-cortex-in-alcohol-use-disorder-recovery
#7
Spencer D Bradshaw, Sterling T Shumway, Cynthia M Dsauza, Neli Morris, Nicholas D Hayes
BACKGROUND: Alcohol use disorders adversely affect individual and societal health. These disorders are a chronic brain disease, and protective factors against relapse should be studied. Prefrontal cortex (PFC) dysfunction is evident in alcohol use disorders, and research that explores recovery of the PFC in alcohol use disorders is needed, specifically in regard to how psychological and behavioral factors can augment medicalized treatments and protect against relapse. For example, hope or a belief that recovery is possible is an important cognitive construct-thought to precede behavioral action-that has been associated with relapse...
March 1, 2017: American Journal of Drug and Alcohol Abuse
https://www.readbyqxmd.com/read/28631348/updating-of-working-memory-in-ecstasy-polydrug-users-findings-from-fnirs
#8
Catharine Montgomery, John E Fisk, Carl A Roberts
AIMS/OBJECTIVES: Cognitive deficits are now well documented in ecstasy (MDMA) users with type and relative demand of task emerging as important factors. The updating component of executive processes appears to be particularly affected. The study reported here used functional near infrared spectroscopy imaging to investigate changes in cortical haemodynamics during memory updating. METHOD: Twenty ecstasy users and 20 non-users completed verbal and spatial memory updating tasks and brain blood oxygenation and deoxygenation change was measured using functional near infrared spectroscopy...
June 19, 2017: Human Psychopharmacology
https://www.readbyqxmd.com/read/28628483/sige-layer-thickness-effect-on-the-structural-and-optical-properties-of-well-organized-sige-sio2-multilayers
#9
Eliana Vieira, Johann Toudert, Anabela Gomes Rolo, Andrea Parisini, Joaquim Leitão, Maria Rosario Correia, Nuno Franco, Eduardo Alves, Adil Chahboun, Javier Martin-Sanchez, Rosalia Serna, Maria de Jesus de Matos Gomes
In this work, we report on the production of regular (SiGe/SiO2)20 multilayer structures by conventional RF-magnetron sputtering, at 350 ºC. Transmission electron microscopy, scanning transmission electron microscopy, raman spectroscopy, and X-ray reflectometry measurements revealed that annealing at a temperature of 1000 ºC lead to the formation of SiGe nanocrystals between SiO2 thin layers with good multilayer stability. Reducing the nominal SiGe layer thickness (tSiGe) from 3.5 to 2 nm results in a transition from continuous SiGe crystalline layer (tSiGe ~ 3...
June 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28627542/gas-phase-vibrational-spectroscopy-of-triphenylamine-the-effect-of-charge-on-structure-and-spectra
#10
Musleh Uddin Munshi, Giel Berden, Jonathan Martens, Jos Oomens
The effect of ionization by oxidation and protonation on the structure and IR spectrum of isolated, gas-phase triphenylamine (TPA) has been investigated by infrared multiple photon dissociation (IRMPD) spectroscopy in the fingerprint range from 600 cm(-1) to 1800 cm(-1) using an infrared free electron laser. IR spectra calculated using density functional theory (DFT) convincingly reproduce the experimental data. Spectral and structural differences are identified among neutral TPA, TPA˙(+) and protonated TPA and qualitatively related to effects of resonance delocalization...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28627364/modulating-perceptual-complexity-and-load-reveals-degradation-of-the-visual-working-memory-network-in-ageing
#11
Sobanawartiny Wijeakumar, Vincent A Magnotta, John P Spencer
Previous neuroimaging studies have reported a posterior to anterior shift of activation in ageing (PASA). Here, we explore the nature of this shift by modulating load (1,2 or 3 items) and perceptual complexity in two variants of a visual working memory task (VWM): a 'simple' color and a 'complex' shape change detection task. Functional near-infrared spectroscopy (fNIRS) was used to record changes in activation in younger (N=24) and older adults (N=24). Older adults exhibited PASA by showing lesser activation in the posterior cortex and greater activation in the anterior cortex when compared to younger adults...
June 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28625050/new-insight-into-the-chemical-nature-of-the-plasmonic-nanostructures-synthesized-by-reduction-of-au-iii-with-sulfide-species
#12
Maria Ana Huergo, Lisandro J Giovanetti, Mario Sergio Moreno, Christoph M Maier, Felix G Requejo, Roberto C Salvarezza, Carolina Vericat
We have studied the products of the controversial synthesis of HAuCl4 with Na2S, which include gold nanostructures (Au NSs) that absorb in the near-infrared (NIR) and are highly promising for photothermal therapies and other nanomedical applications. From high resolution transmission electron microscopy, X-ray absorption spectroscopy and small angle X-ray scattering we have found that only metallic gold nanostructures are formed as a result of this synthesis, with no detectable amount of gold sulfide or other oxidized gold species that could account for the NIR absorption...
June 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28622028/prefrontal-activation-during-executive-tasks-emerges-over-early-childhood-evidence-from-functional-near-infrared-spectroscopy
#13
Elizabeth Smith, Afrouz Anderson, Audrey Thurm, Philip Shaw, Mika Maeda, Fatima Chowdhry, Victor Chernomordik, Amir Gandjbakhche
Functional Near Infrared Spectroscopy (fNIRS) is a brain imaging technique that is well-suited for use in young children, making it particularly useful for investigating the neural bases of the development of executive functions. In the present study, children (ages 4-10) underwent fNIRS while completing response inhibition and working memory tasks. While both tasks were associated with increases in oxyhemoglobin and decreases in deoxyhemoglobin, we found that strength of activation increased with age and with improvements in task performance...
June 16, 2017: Developmental Neuropsychology
https://www.readbyqxmd.com/read/28619652/frontal-temporal-and-parietal-systems-synchronize-within-and-across-brains-during-live-eye-to-eye-contact
#14
Joy Hirsch, Xian Zhang, J Adam Noah, Yumie Ono
Human eye-to-eye contact is a primary source of social cues and communication. In spite of the biological significance of this interpersonal interaction, the underlying neural processes are not well-understood. This knowledge gap, in part, reflects limitations of conventional neuroimaging methods, including solitary confinement in the bore of a scanner and minimal tolerance of head movement that constrain investigations of natural, two-person interactions. However, these limitations are substantially resolved by recent technical developments in functional near-infrared spectroscopy (fNIRS), a non-invasive spectral absorbance technique that detects changes in blood oxygen levels in the brain by using surface-mounted optical sensors...
June 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28619260/neural-correlates-of-decision-making-on-whole-body-yaw-rotation-an-fnirs-study
#15
K N de Winkel, A Nesti, H Ayaz, H H Bülthoff
Prominent accounts of decision making state that decisions are made on the basis of an accumulation of sensory evidence, orchestrated by networks of prefrontal and parietal neural populations. Here we assess whether these findings generalize to decisions on self-motion. Participants were presented with whole body yaw rotations of different durations in a 2-Interval-Forced-Choice paradigm, and tasked to discriminate motions on the basis of their amplitude. The cortical hemodynamic response was recorded using functional near-infrared spectroscopy (fNIRS) while participants were performing the task...
June 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28616108/advances-in-basic-science-methodologies-for-clinical-diagnosis-in-female-stress-urinary-incontinence
#16
REVIEW
Marwa Abdulaziz, Emily G Deegan, Alex Kavanagh, Lynn Stothers, Denise Pugash, Andrew Macnab
We provide an overview of advanced imaging techniques currently being explored to gain greater understanding of the complexity of stress urinary incontinence (SUI) through better definition of structural anatomic data. Two methods of imaging and analysis are detailed for SUI with or without prolapse: 1) open magnetic resonance imaging (MRI) with or without the use of reference lines; and 2) 3D reconstruction of the pelvis using MRI. An additional innovative method of assessment includes the use of near infrared spectroscopy (NIRS), which uses non-invasive photonics in a vaginal speculum to objectively evaluate pelvic floor muscle (PFM) function as it relates to SUI pathology...
June 2017: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
https://www.readbyqxmd.com/read/28611578/prefrontal-hemodynamics-in-toddlers-at-rest-a-pilot-study-of-developmental-variability
#17
Afrouz A Anderson, Elizabeth Smith, Fatima A Chowdhry, Audrey Thurm, Emma Condy, Lauren Swineford, Stacy S Manwaring, Franck Amyot, Dennis Matthews, Amir H Gandjbakhche
Functional near infrared spectroscopy (fNIRS) is a non-invasive functional neuroimaging modality. Although, it is amenable to use in infants and young children, there is a lack of fNIRS research within the toddler age range. In this study, we used fNIRS to measure cerebral hemodynamics in the prefrontal cortex (PFC) in 18-36 months old toddlers (n = 29) as part of a longitudinal study that enrolled typically-developing toddlers as well as those "at risk" for language and other delays based on presence of early language delays...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28607132/impaired-muscle-oxygenation-and-elevated-exercise-blood-pressure-in-hypertensive-patients-links-with-vascular-stiffness
#18
Konstantina Dipla, Areti Triantafyllou, Nikolaos Koletsos, Stavros Papadopoulos, Vasileios Sachpekidis, Ioannis S Vrabas, Eugenia Gkaliagkousi, Andreas Zafeiridis, Stella Douma
This study examined in vivo (1) skeletal muscle oxygenation and microvascular function, at rest and during handgrip exercise, and (2) their association with macrovascular function and exercise blood pressure (BP), in newly diagnosed, never-treated patients with hypertension and normotensive individuals. Ninety-one individuals (51 hypertensives and 40 normotensives) underwent office and 24-hour ambulatory BP, arterial stiffness, and central aortic BP assessment, followed by a 5-minute arterial occlusion and a 3-minute submaximal handgrip exercise...
June 12, 2017: Hypertension
https://www.readbyqxmd.com/read/28605687/anesthetic-dependent-changes-in-the-chain-melting-phase-transition-of-dppg-liposomes-studied-using-near-infrared-spectroscopy-supported-by-pca
#19
Marta Kuć, Katarzyna Cieślik-Boczula, Maria Rospenk
The effect of inhalation anesthetics (enflurane, isoflurane, sevoflurane or halothane) on the lipid chain-melting phase transition of negatively charged phospholipid membranes was studied using near-infrared (NIR) spectroscopy supported by Principal Component Analysis (PCA). NIR spectra of anesthetics-mixed dipalmitoylphosphatidylglycerol (DPPG) membranes were recorded in a range of the first overtone of the symmetric and antisymmetric stretching vibrations of CH2 groups of lipid aliphatic chains as a function of increasing temperature...
June 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28604786/tinnitus-alters-resting-state-functional-connectivity-rsfc-in-human-auditory-and-non-auditory-brain-regions-as-measured-by-functional-near-infrared-spectroscopy-fnirs
#20
Juan San Juan, Xiao-Su Hu, Mohamad Issa, Silvia Bisconti, Ioulia Kovelman, Paul Kileny, Gregory Basura
Tinnitus, or phantom sound perception, leads to increased spontaneous neural firing rates and enhanced synchrony in central auditory circuits in animal models. These putative physiologic correlates of tinnitus to date have not been well translated in the brain of the human tinnitus sufferer. Using functional near-infrared spectroscopy (fNIRS) we recently showed that tinnitus in humans leads to maintained hemodynamic activity in auditory and adjacent, non-auditory cortices. Here we used fNIRS technology to investigate changes in resting state functional connectivity between human auditory and non-auditory brain regions in normal-hearing, bilateral subjective tinnitus and controls before and after auditory stimulation...
2017: PloS One
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