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https://www.readbyqxmd.com/read/28087436/functional-connectivity-analysis-using-fnirs-in-healthy-subjects-during-prolonged-simulated-driving
#1
Liwei Xu, Bitian Wang, Gongcheng Xu, Wei Wang, Zhian Liu, Zengyong Li
Noninvasive and accurate assessment of driving fatigue in relation to brain activity during long-term driving can contribute to traffic safety and accident prevention. This study evaluated functional connectivity (FC) in relevant brain regions. Synergistic mechanisms in different brain regions were detected by a novel simulator, which combined semi-immersive virtual reality technology and functional near-infrared spectroscopy. Each subject was instructed to complete driving tasks coupled with a mental calculation task...
January 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28043899/prefrontal-cortex-mediated-executive-function-as-assessed-by-stroop-task-performance-associates-with-weight-loss-among-overweight-and-obese-adolescents-and-young-adults
#2
Xia Xu, Zhang-Yan Deng, Qin Huang, Wei-Xia Zhang, Chang-Zhu Qi, Jia-Ai Huang
People with cognitive deficits or executive dysfunction are often overweight or obese. Several human neuroimaging studies have found that executive function (EF) predicts food intake and weight gain; however, fewer studies have investigated the relationship between EF and weight loss. The Stroop task is a classic measure of EF that is used in many neuroimaging studies. In the present work, functional near infrared spectroscopy (fNIRS) data were collected during performance of the Stroop task from a sample of overweight or obese adolescents and young adults (n=31) who participated in a summer fitness and weight loss camp...
December 30, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/28041606/acquisition-retention-and-transfer-of-simulated-laparoscopic-tasks-using-fnir-and-a-contextual-interference-paradigm
#3
Patricia A Shewokis, Faiz U Shariff, Yichuan Liu, Hasan Ayaz, Andres Castellanos, D Scott Lind
BACKGROUND: Using functional near infrared spectroscopy, a noninvasive, optical brain imaging tool that monitors changes in hemodynamics within the prefrontal cortex (PFC), we assessed performance and cognitive effort during the acquisition, retention and transfer of multiple simulated laparoscopic tasks by novice learners within a contextual interference paradigm. METHODS: Third-year medical students (n = 10) were randomized to either a blocked or random practice schedule...
December 1, 2016: American Journal of Surgery
https://www.readbyqxmd.com/read/28031998/different-mechanosensory-stimulations-of-the-lower-back-elicit-specific-changes-in-hemodynamics-and-oxygenation-in-cortical-sensorimotor-areas-a-fnirs-study
#4
Andrea Vrana, Michael L Meier, Sabina Hotz-Boendermaker, Barry K Humphreys, Felix Scholkmann
BACKGROUND AND OBJECTIVES: This study aimed at investigating the feasibility of functional near-infrared spectroscopy (fNIRS) to measure changes in cerebral hemodynamics and oxygenation evoked by painful and nonpainful mechanosensory stimulation on the lower back. The main objectives were to investigate whether cortical activity can be (1) detected using functional fNIRS, and (2) if it is possible to distinguish between painful and nonpainful pressure as well as a tactile brushing stimulus based on relative changes in oxy- and deoxyhemoglobin ([O2Hb] and [HHb])...
December 2016: Brain and Behavior
https://www.readbyqxmd.com/read/28028863/stress-and-gender-effects-on-prefrontal-cortex-oxygenation-levels-assessed-during-single-and-dual-task-walking-conditions
#5
Roee Holtzer, Chelsea Scheon, Eleni Demetriou, Jeannette R Mahoney, Meltem Izzetoglu, Cuiling Wang, Joe Verghese
The ability to walk is critical for functional independence and wellbeing. The pre-frontal cortex (PFC) plays a key role in cognitive control of locomotion, notably under attention-demanding conditions. Factors that influence brain responses to cognitive demands of locomotion, however, are poorly understood. Herein we evaluated the individual and combined effects of gender and perceived stress on stride velocity and PFC Oxygenated Hemoglobin (HbO2 ) assessed during single and dual-task walking conditions. The experimental paradigm included Normal-Walk (NW); Cognitive Interference (Alpha); and Walk-While-Talk (WWT) tasks...
December 28, 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28018934/prefrontal-hemodynamic-mapping-by-functional-near-infrared-spectroscopy-in-response-to-thermal-stimulations-over-three-body-sites
#6
Amarnath Yennu, Fenghua Tian, Robert J Gatchel, Hanli Liu
Functional near-infrared spectroscopy (fNIRS) was used to examine hemodynamic responses in the prefrontal cortex (PFC) during noxious thermal pain, induced by thermal stimulations over three different body sites over the right forearm, right temporomandibular joint, and left forearm. Functional NIRS measurements were obtained from three groups of healthy volunteers, one group for each body region. Each group was subjected to both low-pain stimulation (LPS) and high-pain stimulation (HPS) by a [Formula: see text] thermode of a temperature-controlled thermal stimulator over the respective three body sites...
October 2016: Neurophotonics
https://www.readbyqxmd.com/read/28018728/phoebe-a-method-for-real-time-mapping-of-optodes-scalp-coupling-in-functional-near-infrared-spectroscopy
#7
Luca Pollonini, Heather Bortfeld, John S Oghalai
Recent functional near-infrared spectroscopy (fNIRS) instrumentation encompasses several dozen of optodes to enable reconstructing a hemodynamic image of the entire cerebral cortex. Despite its potential clinical applicability, widespread use of fNIRS with human subjects is currently limited by unresolved issues, namely the collection from the entirety of optical channels of signals with a signal-to-noise ratio (SNR) sufficient to carry out a reliable estimation of cortical hemodynamics, and the considerable amount of time that placing numerous optodes take with individuals for whom achieving good optical coupling to the scalp is difficult due to thick or dark hair...
December 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/28017265/cortical-specialisation-to-social-stimuli-from-the-first-days-to-the-second-year-of-life-a-rural-gambian-cohort
#8
S Lloyd-Fox, K Begus, D Halliday, L Pirazzoli, A Blasi, M Papademetriou, M K Darboe, A M Prentice, M H Johnson, S E Moore, C E Elwell
Brain and nervous system development in human infants during the first 1000days (conception to two years of age) is critical, and compromised development during this time (such as from under nutrition or poverty) can have life-long effects on physical growth and cognitive function. Cortical mapping of cognitive function during infancy is poorly understood in resource-poor settings due to the lack of transportable and low-cost neuroimaging methods. Having established a signature cortical response to social versus non-social visual and auditory stimuli in infants from 4 to 6 months of age in the UK, here we apply this functional Near Infrared Spectroscopy (fNIRS) paradigm to investigate social responses in infants from the first postnatal days to the second year of life in two contrasting environments: rural Gambian and urban UK...
November 27, 2016: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28012401/using-fnirs-to-examine-occipital-and-temporal-responses-to-stimulus-repetition-in-young-infants-evidence-of-selective-frontal-cortex-involvement
#9
Lauren L Emberson, Grace Cannon, Holly Palmeri, John E Richards, Richard N Aslin
How does the developing brain respond to recent experience? Repetition suppression (RS) is a robust and well-characterized response of to recent experience found, predominantly, in the perceptual cortices of the adult brain. We use functional near-infrared spectroscopy (fNIRS) to investigate how perceptual (temporal and occipital) and frontal cortices in the infant brain respond to auditory and visual stimulus repetitions (spoken words and faces). In Experiment 1, we find strong evidence of repetition suppression in the frontal cortex but only for auditory stimuli...
December 15, 2016: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28000262/optimal-measurements-of-hemodynamic-response-latency-in-fnirs-using-the-jackknife-approach
#10
Manon Maheux, Étienne Bisaillon-Sicotte, Shirin Tabrizi, Jorge L Armony, Jean-Marc Lina, Pierre Jolicoeur
Functional near-infrared spectroscopy (fNIRS) permits measurements of changes in the concentration of oxygenated and deoxygenated hemoglobin, typically with a higher sampling rate than with other imaging methods based on the hemodynamic response. We examined the potential of the fNIRS technique to estimate variations in the latency of hemodynamic responses to experimental events and sought optimal methods to maximize the reliability and reproducibility of latency effects. We used Monte Carlo simulations using subsamples of real fNIRS measures to estimate the statistical power of different approaches (such as fixed threshold, percent of peak, fractional-area latency, for both individual-subject estimates and estimates from jackknife averages) to detect a known simulated latency shift...
January 2017: Psychophysiology
https://www.readbyqxmd.com/read/27973985/relationship-between-sustained-unilateral-hand-clench-emotional-state-line-bisection-performance-and-prefrontal-cortical-activity-a-functional-near-infrared-spectroscopy-study
#11
Ruth E Propper, Kyle Dodd, Stephen D Christman, Tad T Brunyé
Sustained unilateral hand clenching alters perceptual processing and affective/motivational state, with these alterations presumed to reflect increased hemispheric activity contralateral to the side of motor movement. However, data from electroencephalographic and imaging studies are contradictory regarding the relationship between sustained hand clenching and brain activity. In order to investigate the relationship between brain activity, sustained unilateral hand clenching, and changes in affect and perceptual processing, frontal hemispheric activity was measured via functional near-infrared spectroscopy (fNIRS), using derived O2Hb prior to, during, and post-sustained unilateral hand clench...
December 14, 2016: Laterality
https://www.readbyqxmd.com/read/27965875/measuring-prefrontal-cortical-activity-during-dual-task-walking-in-patients-with-parkinson-s-disease-feasibility-of-using-a-new-portable-fnirs-device
#12
Freek Nieuwhof, Miriam F Reelick, Inbal Maidan, Anat Mirelman, Jeffrey M Hausdorff, Marcel G M Olde Rikkert, Bastiaan R Bloem, Makii Muthalib, Jurgen A H R Claassen
BACKGROUND: Many patients with Parkinson's disease (PD) have difficulties in performing a second task during walking (i.e., dual task walking). Functional near-infrared spectroscopy (fNIRS) is a promising approach to study the presumed contribution of dysfunction within the prefrontal cortex (PFC) to such difficulties. In this pilot study, we examined the feasibility of using a new portable and wireless fNIRS device to measure PFC activity during different dual task walking protocols in PD...
2016: Pilot and Feasibility Studies
https://www.readbyqxmd.com/read/27939793/validating-an-image-based-fnirs-approach-with-fmri-and-a-working-memory-task
#13
Sobanawartiny Wijeakumar, Theodore J Huppert, Vincent A Magnotta, Aaron T Buss, John P Spencer
In the current study, we extend a previous methodological pipeline by adding a novel image reconstruction approach to move functional near-infrared (fNIRS) signals from channel-space on the surface of the head to voxel-space within the brain volume. We validate this methodology by comparing voxel-wise fNIRS results to functional magnetic resonance imaging (fMRI) results from a visual working memory (VWM) task using two approaches. In the first approach, significant voxel-wise correlations were observed between fNIRS and fMRI measures for all experimental conditions across brain regions in the fronto-parieto-temporal cortices...
December 8, 2016: NeuroImage
https://www.readbyqxmd.com/read/27931245/brain-activation-in-frontotemporal-and-alzheimer-s-dementia-a-functional-near-infrared-spectroscopy-study
#14
Florian G Metzger, Betti Schopp, Florian B Haeussinger, Katja Dehnen, Matthis Synofzik, Andreas J Fallgatter, Ann-Christine Ehlis
BACKGROUND: Frontotemporal dementia is an increasingly studied disease, the underlying functional impairments on a neurobiological level of which have not been fully understood. Patients with the behavioral-subtype frontotemporal dementia (bvFTD) are particularly challenging for clinical measurements such as functional imaging due to their behavioral symptoms. Here, an alternative imaging method, functional near-infrared spectroscopy (fNIRS), is introduced to measure task-related cortical brain activation based on blood oxygenation...
December 8, 2016: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/27915210/functional-brain-imaging-of-walking-while-talking-an-fnirs-study
#15
Florian G Metzger, Ann-Christine Ehlis, Florian B Haeussinger, Patrick Schneeweiss, Justin Hudak, Andreas J Fallgatter, Sabrina Schneider
Since functional imaging of whole body movements is not feasible with functional magnetic resonance imaging (fMRI), the present study presents in vivo functional near-infrared spectroscopy (fNIRS) as a suitable technique to measure body movement effects on fronto-temporo-parietal cortical activation in single- and dual-task paradigms. Previous fNIRS applications in studies addressing whole body movements were typically limited to the assessment of prefrontal brain areas. The current study investigated brain activation in the frontal, temporal and parietal cortex of both hemispheres using functional near-infrared spectroscopy (fNIRS) with two large 4×4 probe-sets with 24 channels each during single and dual gait tasks...
November 30, 2016: Neuroscience
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
#16
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
#17
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
#18
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
#19
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
#20
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
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