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https://www.readbyqxmd.com/read/27909403/cortical-sensorimotor-processing-of-painful-pressure-in-patients-with-chronic-lower-back-pain-an-optical-neuroimaging-study-using-fnirs
#1
Andrea Vrana, Michael L Meier, Sabina Hotz-Boendermaker, Barry K Humphreys, Felix Scholkmann
In this study we investigated sensorimotor processing of painful pressure stimulation on the lower back of patients with chronic lower back pain (CLBP) by using functional near-infrared spectroscopy (fNIRS) to measure changes in cerebral hemodynamics and oxygenation. The main objectives were whether patients with CLBP show different relative changes in oxy- and deoxyhemoglobin ([O2Hb] and [HHb]) in the supplementary motor area (SMA) and primary somatosensory cortex (S1) compared to healthy controls (HC). Twelve patients with CLBP (32 ± 6...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27894901/bilingualism-yields-language-specific-plasticity-in-left-hemisphere-s-circuitry-for-learning-to-read-in-young-children
#2
K K Jasińska, M S Berens, I Kovelman, L A Petitto
How does bilingual exposure impact children's neural circuitry for learning to read? Theories of bilingualism suggests that exposure to two languages may yield a functional and neuroanatomical adaptation to support the learning of two languages (Klein et al., 2014). To test the hypothesis that this neural adaptation may vary as a function of structural and orthographic characteristics of bilinguals' two languages, we compared Spanish-English and French-English bilingual children, and English monolingual children, using functional Near Infrared Spectroscopy neuroimaging (fNIRS, ages 6-10, N = 26)...
November 25, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27872636/analyzing-brain-functions-by-subject-classification-of-functional-near-infrared-spectroscopy-data-using-convolutional-neural-networks-analysis
#3
Satoru Hiwa, Kenya Hanawa, Ryota Tamura, Keisuke Hachisuka, Tomoyuki Hiroyasu
Functional near-infrared spectroscopy (fNIRS) is suitable for noninvasive mapping of relative changes in regional cortical activity but is limited for quantitative comparisons among cortical sites, subjects, and populations. We have developed a convolutional neural network (CNN) analysis method that learns feature vectors for accurate identification of group differences in fNIRS responses. In this study, subject gender was classified using CNN analysis of fNIRS data. fNIRS data were acquired from male and female subjects during a visual number memory task performed in a white noise environment because previous studies had revealed that the pattern of cortical blood flow during the task differed between males and females...
2016: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/27867700/mental-stress-assessment-using-simultaneous-measurement-of-eeg-and-fnirs
#4
Fares Al-Shargie, Masashi Kiguchi, Nasreen Badruddin, Sarat C Dass, Ahmad Fadzil Mohammad Hani, Tong Boon Tang
Previous studies reported mental stress as one of the major contributing factors leading to various diseases such as heart attack, depression and stroke. An accurate stress assessment method may thus be of importance to clinical intervention and disease prevention. We propose a joint independent component analysis (jICA) based approach to fuse simultaneous measurement of electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) on the prefrontal cortex (PFC) as a means of stress assessment...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27867699/characterization-of-autism-spectrum-disorder-with-spontaneous-hemodynamic-activity
#5
Jun Li, Lina Qiu, Lingyu Xu, Ernest V Pedapati, Craig A Erickson, Ulas Sunar
Functional near-infrared spectroscopy (fNIRS) was used to investigate spontaneous hemodynamic activity in the temporal cortex for typically developing (TD) children and children with autism spectrum disorder (ASD). Forty-seven children participated in the experiments including twenty-five with ASD. Compared with TD children, children with ASD showed weaker bilateral resting-state functional connectivity (RSFC), but much stronger fluctuation magnitude in terms of oxy-hemoglobin (HbO2) and deoxy-hemoglobin (Hb)...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27847475/left-lateral-prefrontal-activity-reflects-a-change-of-behavioral-tactics-to-cope-with-a-given-rule-an-fnirs-study
#6
Naoki Miura, Naoko Shirasawa, Shin'ichiro Kanoh
Rules prescribe human behavior and our attempts to choose appropriate behavior under a given rule. Cognitive control, a mechanism to choose and evaluate actions under a rule, is required to determine the appropriate behavior within the limitations of that rule. Consequently, such cognitive control increases mental workload. However, the workload caused by a cognitive task might be different when an additional rule must be considered in choosing the action. The present study was a functional near-infrared spectroscopy (fNIRS) investigation of an experimental task, in which the difficulty of an operation and existence of an additional rule were manipulated to dissociate the influence of that additional rule on cognitive processing...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27846398/cortical-activation-during-balancing-on-a-balance-board
#7
Fabian Herold, Katja Orlowski, Sabrina Börmel, Notger G Müller
BACKGROUND: Keeping one's balance is a complex motor task which requires the integration and processing of different sensory information. For this, higher cortical processes are essential. However, in the past research dedicated to the brain's involvement in balance control has predominantly used virtual reality paradigms whilst little is known about cortical activation during the challenging balancing on unstable surfaces (e.g. balance board). Hence, the main goal of this study was the simultaneous evaluation of cortical activation patterns and sway parameters during balancing on a balance board...
November 12, 2016: Human Movement Science
https://www.readbyqxmd.com/read/27833547/new-insights-into-signed-path-coefficient-granger-causality-analysis
#8
Jian Zhang, Chong Li, Tianzi Jiang
Granger causality analysis, as a time series analysis technique derived from econometrics, has been applied in an ever-increasing number of publications in the field of neuroscience, including fMRI, EEG/MEG, and fNIRS. The present study mainly focuses on the validity of "signed path coefficient Granger causality," a Granger-causality-derived analysis method that has been adopted by many fMRI researches in the last few years. This method generally estimates the causality effect among the time series by an order-1 autoregression, and defines a positive or negative coefficient as an "excitatory" or "inhibitory" influence...
2016: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/27833164/periodontal-tactile-input-activates-the-prefrontal-cortex
#9
Nobuaki Higaki, Takaharu Goto, Tetsuo Ichikawa
The prefrontal cortex (PFC) plays a role in complex cognitive behavioural planning, decision-making, and social behaviours. However, the effects of sensory integration during motor tasks on PFC activation have not been studied to date. Therefore, we investigated the effect of peripheral sensory information and external information on PFC activation using functional near-infrared spectroscopy (fNIRS). Cerebral blood flow (CBF) was increased around bilateral Brodmann areas 46 and 10 during visual and auditory information integration during an occlusal force (biting) task...
November 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27818001/simultaneous-eeg-fnirs-reveals-how-age-and-feedback-affect-motor-imagery-signatures
#10
Catharina Zich, Stefan Debener, Ann-Kathrin Thoene, Ling-Chia Chen, Cornelia Kranczioch
Stroke frequently results in motor impairment. Motor imagery (MI), the mental practice of movements, has been suggested as a promising complement to other therapeutic approaches facilitating motor rehabilitation. Of particular potential is the combination of MI with neurofeedback (NF). However, MI NF protocols have been largely optimized only in younger healthy adults, although strokes occur more frequently in older adults. The present study examined the influence of age on the neural correlates of MI supported by electroencephalogram (EEG)-based NF and on the neural correlates of motor execution...
October 15, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/27812334/comparable-cerebral-oxygenation-patterns-in-younger-and-older-adults-during-dual-task-walking-with-increasing-load
#11
Sarah A Fraser, Olivier Dupuy, Philippe Pouliot, Frédéric Lesage, Louis Bherer
The neuroimaging literature on dual-task gait clearly demonstrates increased prefrontal cortex (PFC) involvement when performing a cognitive task while walking. However, findings from direct comparisons of the cerebral oxygenation patterns of younger (YA) and older (OA) adults during dual-task walking are mixed and it is unclear how YA and OA respond to increasing cognitive load (difficulty) while walking. This functional near infra-red (fNIRS) study examined cerebral oxygenation of YA and OA during self-paced dual-task treadmill walking at two different levels of cognitive load (auditory n-back)...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27806119/frontal-lobe-hemodynamic-responses-to-painful-stimulation-a-potential-brain-marker-of-nociception
#12
Christopher M Aasted, Meryem A Yücel, Sarah C Steele, Ke Peng, David A Boas, Lino Becerra, David Borsook
The purpose of this study was to use functional near-infrared spectroscopy (fNIRS) to examine patterns of both activation and deactivation that occur in the frontal lobe in response to noxious stimuli. The frontal lobe was selected because it has been shown to be activated by noxious stimuli in functional magnetic resonance imaging studies. The brain region is located behind the forehead which is devoid of hair, providing a relative ease of placement for fNIRS probes on this area of the head. Based on functional magnetic resonance imaging studies showing blood-oxygenation-level dependent changes in the frontal lobes, we evaluated functional near-infrared spectroscopy measures in response to two levels of electrical pain in awake, healthy human subjects (n = 10; male = 10)...
2016: PloS One
https://www.readbyqxmd.com/read/27799581/efficacy-of-an-amblyopia-treatment-program-with-both-eyes-open-a-functional-near-infrared-spectroscopy-study
#13
Yo Iwata, Tomoya Handa, Hitoshi Ishikawa, Nobuyuki Shoji, Kimiya Shimizu
INTRODUCTION AND PURPOSE: To investigate the efficacy of an amblyopia treatment program with both eyes open. METHODS: Ten subjects (mean age 20.5 ± 1.5 years) were enrolled. All subjects had un-remarkable ophthalmic examinations, but several subjects had minor refractive errors. Vision function was evaluated using the 3-D visual function trainer-ORTe. Brain measurements were made using functional near-infrared spectroscopy (fNIRS) to examine the oxygenated hemoglobin (HbO2) concentration change upon visual stimulus presentation...
January 2016: American Orthoptic Journal
https://www.readbyqxmd.com/read/27790181/competition-in-the-brain-the-contribution-of-eeg-and-fnirs-modulation-and-personality-effects-in-social-ranking
#14
Michela Balconi, Maria E Vanutelli
In the present study, the social ranking perception in competition was explored. Brain response (alpha band oscillations, EEG; hemodynamic activity, O2Hb), as well as self-perception of social ranking, cognitive performance, and personality trait (Behavioral Activation System, BAS) were considered during a competitive joint-action. Subjects were required to develop a strategy to obtain a better outcome than a competitor (C) (in term of error rate, and response time, RT). A pre-feedback (without a specific feedback on the performance) and a post-feedback condition (which reinforced the improved performance) were provided...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27788178/bundled-optode-method-in-functional-near-infrared-spectroscopy
#15
Hoang-Dung Nguyen, Keum-Shik Hong, Yong-Il Shin
In this paper, a theory for detection of the absolute concentrations of oxy-hemoglobin (HbO) and deoxy-hemoglobin (HbR) from hemodynamic responses using a bundled-optode configuration in functional near-infrared spectroscopy (fNIRS) is proposed. The proposed method is then applied to the identification of two fingers (i.e., little and thumb) during their flexion and extension. This experiment involves a continuous-wave-type dual-wavelength (760 and 830 nm) fNIRS and five healthy male subjects. The active brain locations of two finger movements are identified based on the analysis of the t- and p-values of the averaged HbOs, which are quite distinctive...
2016: PloS One
https://www.readbyqxmd.com/read/27774047/linking-resting-state-networks-in-the-prefrontal-cortex-to-executive-function-a-functional-near-infrared-spectroscopy-study
#16
Jia Zhao, Jiangang Liu, Xin Jiang, Guifei Zhou, Guowei Chen, Xiao P Ding, Genyue Fu, Kang Lee
Executive function (EF) plays vital roles in our everyday adaptation to the ever-changing environment. However, limited existing studies have linked EF to the resting-state brain activity. The functional connectivity in the resting state between the sub-regions of the brain can reveal the intrinsic neural mechanisms involved in cognitive processing of EF without disturbance from external stimuli. The present study investigated the relations between the behavioral executive function (EF) scores and the resting-state functional network topological properties in the Prefrontal Cortex (PFC)...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27772776/brain-activation-changes-during-locomotion-in-middle-aged-to-older-adults-with-multiple-sclerosis
#17
Manuel E Hernandez, Roee Holtzer, Gioella Chaparro, Kharine Jean, Julia M Balto, Brian M Sandroff, Meltem Izzetoglu, Robert W Motl
Mobility and cognitive impairments are common in persons with multiple sclerosis (MS), and are expected to worsen with increasing age. However, no studies, to date, in part due to limitations of conventional neuroimaging methods, have examined changes in brain activation patterns during active locomotion in older patients with MS. This study used functional Near Infrared Spectroscopy (fNIRS) to evaluate real-time neural activation differences in the pre-frontal cortex (PFC) between middle-aged to older adults with MS and healthy controls during single (Normal Walk; NW) and dual-task (Walking While Talking; WWT) locomotion tasks...
November 15, 2016: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/27752520/probe-hosted-silicon-photomultipliers-for-time-domain-functional-near-infrared-spectroscopy-phantom-and-in-vivo-tests
#18
Rebecca Re, Edoardo Martinenghi, Alberto Dalla Mora, Davide Contini, Antonio Pifferi, Alessandro Torricelli
We report the development of a compact probe for time-domain (TD) functional near-infrared spectroscopy (fNIRS) based on a fast silicon photomultiplier (SiPM) that can be put directly in contact with the sample without the need of optical fibers for light collection. We directly integrated an avalanche signal amplification stage close to the SiPM, thus reducing the size of the detection channel and optimizing the signal immunity to electromagnetic interferences. The whole detection electronics was placed in a plastic screw holder compatible with the electroencephalography standard cap for measurement on brain or with custom probe holders...
October 2016: Neurophotonics
https://www.readbyqxmd.com/read/27725946/design-of-multichannel-functional-near-infrared-spectroscopy-system-with-application-to-propofol-and-sevoflurane-anesthesia-monitoring
#19
Zhenhu Liang, Yue Gu, Xuejing Duan, Lei Cheng, Shujuan Liang, Yunjie Tong, Xiaoli Li
Monitoring the changes of cerebral hemodynamics and the state of consciousness during general anesthesia (GA) is clinically important. There is a great need for developing advanced detectors to investigate the physiological processes of the brain during GA. We developed a multichanneled, functional near-infrared spectroscopy (fNIRS) system device and applied it to GA operation monitoring. The cerebral hemodynamic data from the forehead of 11 patients undergoing propofol and sevoflurane anesthesia were analyzed...
October 2016: Neurophotonics
https://www.readbyqxmd.com/read/27725827/analysis-of-different-classification-techniques-for-two-class-functional-near-infrared-spectroscopy-based-brain-computer-interface
#20
Noman Naseer, Nauman Khalid Qureshi, Farzan Majeed Noori, Keum-Shik Hong
We analyse and compare the classification accuracies of six different classifiers for a two-class mental task (mental arithmetic and rest) using functional near-infrared spectroscopy (fNIRS) signals. The signals of the mental arithmetic and rest tasks from the prefrontal cortex region of the brain for seven healthy subjects were acquired using a multichannel continuous-wave imaging system. After removal of the physiological noises, six features were extracted from the oxygenated hemoglobin (HbO) signals. Two- and three-dimensional combinations of those features were used for classification of mental tasks...
2016: Computational Intelligence and Neuroscience
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