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https://www.readbyqxmd.com/read/28714545/focal-hemodynamic-responses-in-the-stimulated-hemisphere-during-high-definition-transcranial-direct-current-stimulation
#1
Makii Muthalib, Pierre Besson, John Rothwell, Stéphane Perrey
OBJECTIVE: High-definition transcranial direct current stimulation (HD-tDCS) using a 4 × 1 electrode montage has been previously shown using modeling and physiological studies to constrain the electric field within the spatial extent of the electrodes. The aim of this proof-of-concept study was to determine if functional near-infrared spectroscopy (fNIRS) neuroimaging can be used to determine a hemodynamic correlate of this 4 × 1 HD-tDCS electric field on the brain. MATERIALS AND METHODS: In a three session cross-over study design, 13 healthy males received one sham (2 mA, 30 sec) and two real (HD-tDCS-1 and HD-tDCS-2, 2 mA, 10 min) anodal HD-tDCS targeting the left M1 via a 4 × 1 electrode montage (anode on C3 and 4 return electrodes 3...
July 17, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28701914/reduced-prefrontal-cortex-activation-in-children-with-attention-deficit-hyperactivity-disorder-during-go-no-go-task-a-functional-near-infrared-spectroscopy-study
#2
Shuo Miao, Junxia Han, Yue Gu, Xin Wang, Wenhong Song, Dongqing Li, Zhao Liu, Jian Yang, Xiaoli Li
Objective: Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neuropsychiatric disorders in children and affects 3 to 5% of school-aged children. This study is to demonstrate whether functional near-infrared spectroscopy (fNIRS) can detect the changes in the concentration of oxygenated hemoglobin (oxy-HB) in children with ADHD and typically developing children (TD children). Method: In this study, 14 children with ADHD and 15 TD children were studied. Metabolic signals of functional blood oxygen were recorded by using fNIRS during go/no-go task...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28701789/mental-workload-and-neural-efficiency-quantified-in-the-prefrontal-cortex-using-fnirs
#3
Mickaël Causse, Zarrin Chua, Vsevolod Peysakhovich, Natalia Del Campo, Nadine Matton
An improved understanding of how the brain allocates mental resources as a function of task difficulty is critical for enhancing human performance. Functional near infrared spectroscopy (fNIRS) is a field-deployable optical brain monitoring technology that provides a direct measure of cerebral blood flow in response to cognitive activity. We found that fNIRS was sensitive to variations in task difficulty in both real-life (flight simulator) and laboratory settings (tests measuring executive functions), showing increased concentration of oxygenated hemoglobin (HbO2) and decreased concentration of deoxygenated hemoglobin (HHb) in the prefrontal cortex as the tasks became more complex...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692185/an-application-of-functional-near-infrared-spectroscopy-as-supplementary-examination-for-diagnosis-of-clinical-stages-of-psychosis-spectrum
#4
Shinsuke Koike, Satomura Yoshihiro, Shingo Kawasaki, Yukika Nishimura, Akihide Kinoshita, Hanako Sakurada, Mika Yamagishi, Eriko Ichikawa, Jun Matsuoka, Naohiro Okada, Ryu Takizawa, Kiyoto Kasai
AIM: Research efforts aiming at neuroimaging-aided differential diagnosis for psychiatric disorders have been progressing rapidly. A previous multisite study has developed supplementary diagnostic system using functional near-infrared spectroscopy (fNIRS) that can be easily applied to clinical settings. However, few neuroimaging biomarkers have been developed for psychosis spectrum with various clinical stages. METHODS: We employed the fNIRS as a clinical examination device for 143 participants, comprising 47 ultra-high risk (UHR) individuals, 30 patients with first-episode psychosis (FEP), 34 patients with chronic schizophrenia (ChSZ), and 33 healthy controls, who were independent of the previous study...
July 10, 2017: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28689600/meditation-and-the-brain-neuronal-correlates-of-mindfulness-as-assessed-with-near-infrared-spectroscopy
#5
Friederike Gundel, Johanna von Spee, Sabrina Schneider, Florian B Haeussinger, Martin Hautzinger, Michael Erb, Andreas J Fallgatter, Ann-Christine Ehlis
Mindfulness meditation as a therapeutic intervention has been shown to have positive effects on psychological problems such as depression, pain or anxiety disorders. In this study, we used functional near-infrared spectroscopy (fNIRS) to detect differences in hemodynamic responses of meditation experts (14 participants) and a control group (16 participants) in a resting and a mindfulness condition. In both conditions, the sound of a meditation bowl was used to find group differences in the auditory system and adjacent cortical areas...
April 8, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28685457/physiological-effects-of-continuous-colored-light-exposure-on-mayer-wave-activity-in-cerebral-hemodynamics-a-functional-near-infrared-spectroscopy-fnirs-study
#6
A J Metz, S D Klein, F Scholkmann, U Wolf
We are increasingly exposed to colored light, but its impact on human physiology is not yet extensively investigated. In the present study we aimed to determine the effects of colored light on human cerebral Mayer wave activity (MWA). We measured oxy- ([O2Hb]), deoxy- ([HHb]), total hemoglobin ([tHb]) concentrations and tissue oxygen saturation (StO2) by functional near-infrared spectroscopy (fNIRS) in the left and right pre-frontal cortex (L-PFC, R-PFC) of 17 subjects (median age: 29 years, 6 women). In a randomized crossover design subjects were exposed to blue, red, green, and yellow LED light for 10 min...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28685451/site-specificity-of-changes-in-cortical-oxyhaemoglobin-concentration-induced-by-water-immersion
#7
D Sato, K Yamashiro, Y Yamazaki, A Tsubaki, H Onishi, N Takehara, A Maruyama
Our previous studies have shown that water immersion (WI) changes sensorimotor processing and cortical excitability in the sensorimotor regions of the brain. The present study examined the site specificity of the brain activation during WI using functional near infrared spectroscopy (fNIRS). Cortical oxyhaemoglobin (O2Hb) levels in the anterior and posterior parts of the supplementary motor area (pre-SMA and SMA), primary motor cortex (M1), primary somatosensory cortex (S1), and posterior parietal cortex (PPC) were recorded using fNIRS (OMM-3000; Shimadzu Co...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28685449/relationships-between-gum-chewing-and-stroop-test-a-pilot-study
#8
Y Kawakami, T Takeda, M Konno, Y Suzuki, Y Kawano, T Ozawa, Y Kondo, K Sakatani
Cognitive function tends to decrease with aging, therefore maintenance of this function in an aging society is an important issue. The role of chewing in nutrition is important. Although several studies indicate that gum chewing is thought to improve cognitive function, it remains debatable whether gum-chewing does in fact improve cognitive function. The Stroop test is a psychological tool used to measure cognition. A shorter reaction time indicates a mean higher behavioral performance and higher levels of oxy-Hb concentration...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28685446/pfc-blood-oxygenation-changes-in-four-different-cognitive-tasks
#9
Tomotaka Takeda, Yoshiaki Kawakami, Michiyo Konno, Yoshiaki Matsuda, Masayasu Nishino, Yoshihiro Suzuki, Yoshiaki Kawano, Kazunori Nakajima, Toshimitsu Ozawa, Yoshihiro Kondo, Kaoru Sakatani
Aging often results in a decline in cognitive function, related to alterations in the prefrontal cortex (PFC) activation. Maintenance of this function in an aging society is an important issue. Some practices/drills, moderate exercise, mastication, and a cognitive task itself could enhance cognitive function. In this validation study, before evaluating the effects of some drills on the elderly, we examined the neural substrate of blood oxygenation changes by the use of four cognitive tasks and fNIRS. Seven healthy volunteers (mean age 25...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28685438/functional-nirs-measurement-of-cytochrome-c-oxidase-demonstrates-a-more-brain-specific-marker-of-frontal-lobe-activation-compared-to-the-haemoglobins
#10
Isabel de Roever, Gemma Bale, Robert J Cooper, Ilias Tachtsidis
Functional near-infrared spectroscopy (fNIRS) is an increasingly common neuromonitoring technique used to observe evoked haemodynamic changes in the brain in response to a stimulus. The measurement is typically in terms of concentration changes of oxy- (∆HbO2) and deoxy- (∆HHb) haemoglobin. However, noise from systemic fluctuations in the concentration of these chromophores can contaminate stimulus-evoked haemodynamic responses, leading to misinterpretation of results. Short-separation channels can be used to regress out extracerebral haemodynamics to better reveal cerebral changes, significantly improving the reliability of fNIRS...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28680906/neurofeedback-based-functional-near-infrared-spectroscopy-upregulates-motor-cortex-activity-in-imagined-motor-tasks
#11
Pawan Lapborisuth, Xian Zhang, Adam Noah, Joy Hirsch
Neurofeedback is a method for using neural activity displayed on a computer to regulate one's own brain function and has been shown to be a promising technique for training individuals to interact with brain-machine interface applications such as neuroprosthetic limbs. The goal of this study was to develop a user-friendly functional near-infrared spectroscopy (fNIRS)-based neurofeedback system to upregulate neural activity associated with motor imagery, which is frequently used in neuroprosthetic applications...
April 2017: Neurophotonics
https://www.readbyqxmd.com/read/28673464/force-related-hemodynamic-responses-during-execution-and-imagery-of-a-hand-grip-task-a-functional-near-infrared-spectroscopy-study
#12
Selina C Wriessnegger, Daniela Kirchmeyr, Günther Bauernfeind, Gernot R Müller-Putz
We examined force related hemodynamic changes during the performance of a motor execution (ME) and motor imagery (MI) task by means of multichannel functional near infrared spectroscopy (fNIRS). The hemodynamic responses of fourteen healthy participants were measured while they performed a hand grip execution or imagery task with low and high grip forces. We found an overall higher increase of [oxy-Hb] concentration changes during ME for both grip forces but with a delayed peak maximum for the lower grip force...
June 30, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28668280/classification-of-somatosensory-cortex-activities-using-fnirs
#13
Keum-Shik Hong, M Raheel Bhutta, Xiaolong Liu, Yong-Il Shin
The ability of the somatosensory cortex in differentiating various tactile sensations is very important for a person to perceive the surrounding environment. In this study, we utilize a lab-made multi-channel functional near-infrared spectroscopy (fNIRS) to discriminate the hemodynamic responses (HRs) of four different tactile stimulations (handshake, ball grasp, poking, and cold temperature) applied to the right hand of eight healthy male subjects. The activated brain areas per stimulation are identified with the t-values between the measured data and the desired hemodynamic response function...
June 28, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28663892/assessment-of-mental-stress-effects-on-prefrontal-cortical-activities-using-canonical-correlation-analysis-an-fnirs-eeg-study
#14
Fares Al-Shargie, Tong Boon Tang, Masashi Kiguchi
This paper presents an investigation about the effects of mental stress on prefrontal cortex (PFC) subregions using simultaneous measurement of functional Near-Infrared Spectroscopy (fNIRS) and Electroencephalography (EEG) signals. The aim is to explore canonical correlation analysis (CCA) technique to study the relationship among the bi-modality signals in mental stress assessment, and how we could fuse the signals for better accuracy in stress detection. Twenty-five male healthy subjects participated in the study while performing mental arithmetic task under control and stress (under time pressure with negative feedback) conditions...
May 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28663052/application-of-a-common-spatial-pattern-based-algorithm-for-an-fnirs-based-motor-imagery-brain-computer-interface
#15
Shen Zhang, Yanchun Zheng, Daifa Wang, Ling Wang, Jianai Ma, Jing Zhang, Weihao Xu, Deyu Li, Dan Zhang
Motor imagery is one of the most investigated paradigms in the field of brain-computer interfaces (BCIs). The present study explored the feasibility of applying a common spatial pattern (CSP)-based algorithm for a functional near-infrared spectroscopy (fNIRS)-based motor imagery BCI. Ten participants performed kinesthetic imagery of their left- and right-hand movements while 20-channel fNIRS signals were recorded over the motor cortex. The CSP method was implemented to obtain the spatial filters specific for both imagery tasks...
June 27, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28662727/frontal-brain-activation-changes-due-to-dual-tasking-under-partial-body-weight-support-conditions-in-older-adults-with-multiple-sclerosis
#16
Gioella Chaparro, Julia M Balto, Brian M Sandroff, Roee Holtzer, Meltem Izzetoglu, Robert W Motl, Manuel E Hernandez
BACKGROUND: Gait impairments present while dual-tasking in older adults with multiple sclerosis (MS) have been associated with an increased risk of falls. Prior studies have examined prefrontal cortex (PFC) activity using functional near infrared spectroscopy (fNIRS) while dual-tasking in older adults with and without cognitive impairment. While the benefits of partial body weight support (PBWS) on gait have been clearly outlined in the literature, the potential use of PBWS to improve the ability to dual task in older adults with and without MS has not been examined...
June 29, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28662465/neuroimaging-of-an-attention-demanding-dual-task-during-dynamic-postural-control
#17
Andrea L Rosso, Massimo Cenciarini, Patrick J Sparto, Patrick J Loughlin, Joseph M Furman, Theodore J Huppert
Cognitive tasks impact postural control when performed concurrently as dual-tasks. This is presumed to result from capacity limitations in relevant brain regions. We used functional near-infrared spectroscopy (fNIRS) to measure brain activation of the left motor, temporal, and dorsal-lateral prefrontal brain regions of younger (n=6) and older (n=10) adults. Brain activation was measured during an auditory choice reaction task (CRT) and standing on a dynamic posturography platform, both as single-tasks and concurrently as dual-task...
June 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28659467/motor-learning-in-a-complex-balance-task-and-associated-neuroplasticity-a-comparison-between-endurance-athletes-and-non-athletes
#18
Oliver Seidel, Daniel Carius, Rouven Kenville, Patrick Ragert
Studies suggested that motor expertise is associated with functional and structural brain alterations, which positively affect sensorimotor performance and learning capabilities. The purpose of the present study was to unravel differences in motor skill learning and associated functional neuroplasticity between endurance athletes (EA) and non-athletes (NA). For this purpose, participants had to perform a multimodal balance task (MBT) training on two sessions which were separated by one week. Before and after MBT-training, a static balance task (SBT) had to be performed...
June 28, 2017: Journal of Neurophysiology
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
#19
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...
October 15, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28644914/the-role-of-expectation-in-multisensory-body-representation-neural-evidence
#20
Francesca Ferri, Ettore Ambrosini, Paola Pinti, Arcangelo Merla, Marcello Costantini
Sensory events contribute to body ownership, the feeling that the body belongs to me. However, the encoding of sensory events is not only reactive, but also proactive in that our brain generates prediction about forthcoming stimuli. In previous studies we have shown that prediction of sensory events is a sufficient condition to induce the sense of body ownership. In this study we investigate the underlying neural mechanisms. Participants were seated with their right arm resting upon a table just below another smaller table...
June 23, 2017: European Journal of Neuroscience
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