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Electro physiology

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https://www.readbyqxmd.com/read/28342407/music-and-natural-sounds-in-an-auditory-steady-state-response-based-brain-computer-interface-to-increase-user-acceptance
#1
Jeong Heo, Hyun Jae Baek, Seunghyeok Hong, Min Hye Chang, Jeong Su Lee, Kwang Suk Park
Patients with total locked-in syndrome are conscious; however, they cannot express themselves because most of their voluntary muscles are paralyzed, and many of these patients have lost their eyesight. To improve the quality of life of these patients, there is an increasing need for communication-supporting technologies that leverage the remaining senses of the patient along with physiological signals. The auditory steady-state response (ASSR) is an electro-physiologic response to auditory stimulation that is amplitude-modulated by a specific frequency...
March 18, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28334999/rewiring-the-primary-somatosensory-cortex-in-carpal-tunnel-syndrome-with-acupuncture
#2
Yumi Maeda, Hyungjun Kim, Norman Kettner, Jieun Kim, Stephen Cina, Cristina Malatesta, Jessica Gerber, Claire McManus, Rebecca Ong-Sutherland, Pia Mezzacappa, Alexandra Libby, Ishtiaq Mawla, Leslie R Morse, Ted J Kaptchuk, Joseph Audette, Vitaly Napadow
Carpal tunnel syndrome is the most common entrapment neuropathy, affecting the median nerve at the wrist. Acupuncture is a minimally-invasive and conservative therapeutic option, and while rooted in a complex practice ritual, acupuncture overlaps significantly with many conventional peripherally-focused neuromodulatory therapies. However, the neurophysiological mechanisms by which acupuncture impacts accepted subjective/psychological and objective/physiological outcomes are not well understood. Eligible patients (n = 80, 65 female, age: 49...
March 2, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28277429/the-influence-of-exercise-to-rest-ratios-on-physical-and-physiological-performance-during-hurling-specific-small-sided-games
#3
Shane Malone, Brian Hughes, Kieran Collins
The current study examined the impact of different exercise to rest ratios on hurling specific small-sided games (SSG). Thirty-four (n = 34) hurling players were monitored during an in-season training period. Heart rate (Polar Electro Oy, Kempele, Finland) and global positioning system technology (VX Sport, 4-Hz, Lower Hutt, New Zealand) were used to analyse the physical and physiological differences between exercise to rest ratios across bouts of SSG. Total distance (m) high-speed distance (m) (≥17 km·h), very high-speed distance (≥22 km·h) (m), total accelerations (n), acceleration distance (m), peak velocity (km·h) and % maximum heart rate (%HRmax) were measured...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28269050/dictionary-learning-for-sparse-representation-and-classification-of-neural-spikes
#4
Ahmed H Dallal, Yiran Chen, Douglas Weber, Zhi-Hong Mao
Spike sorting is the problem of identifying and clustering neurons spiking activity from recorded extracellular electro-physiological data. This is important for experimental neuroscience. Existing approaches to solve this problem consist of three steps: spike detection, feature extraction, and clustering. In our method, we use Fisher discriminant based dictionary learning to learn dictionary, whose sub-dictionaries are class specific, and estimate discriminative sparse coding coefficients by minimizing the within class scatter and maximizing the between class scatter...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268339/sensing-textile-seam-line-for-wearable-multimodal-physiological-monitoring
#5
M McKnight, T Agcayazi, H Kausche, T Ghosh, A Bozkurt
This paper investigates a novel multimodal sensing method by forming seam-lines of conductive textile fibers into commercially available fabrics. The proposed ultra-low cost micro-electro-mechanical sensor would provide, wearable, flexible, textile based biopotential signal recording, wetness detection and tactile sensing simultaneously. Three types of fibers are evaluated for their array-based sensing capability, including a 3D printed conductive fiber, a multiwall carbon nanotube based fiber, and a commercially available stainless steel conductive thread...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28263770/human-physiological-responses-to-wooden-indoor-environment
#6
Xi Zhang, Zhiwei Lian, Yong Wu
Previous studies are mainly focused on non-wooden environments, whereas few are concerned with wooden ones. How wooden indoor environments impact the physiology of the occupants is still unclear. The purpose of this study was to explore the distinct physiological responses to wooden and non-wooden indoor environments, assessed by physiological parameters tests including blood pressure, electrocardiogram measurements, electro-dermal activity, oxyhemoglobin saturation, skin temperature, and near distance vision...
March 2, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28227266/dictionary-learning-for-sparse-representation-and-classification-of-neural-spikes
#7
Ahmed H Dallal, Yiran Chen, Douglas Weber, Zhi-Hong Mao, Ahmed H Dallal, Yiran Chen, Douglas Weber, Zhi-Hong Mao, Douglas Weber, Zhi-Hong Mao, Yiran Chen, Ahmed H Dallal
Spike sorting is the problem of identifying and clustering neurons spiking activity from recorded extracellular electro-physiological data. This is important for experimental neuroscience. Existing approaches to solve this problem consist of three steps: spike detection, feature extraction, and clustering. In our method, we use Fisher discriminant based dictionary learning to learn dictionary, whose sub-dictionaries are class specific, and estimate discriminative sparse coding coefficients by minimizing the within class scatter and maximizing the between class scatter...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226500/sensing-textile-seam-line-for-wearable-multimodal-physiological-monitoring
#8
M McKnight, T Agcayazi, H Kausche, T Ghosh, A Bozkurt, M McKnight, T Agcayazi, H Kausche, T Ghosh, A Bozkurt, T Ghosh, T Agcayazi, M McKnight, A Bozkurt, H Kausche
This paper investigates a novel multimodal sensing method by forming seam-lines of conductive textile fibers into commercially available fabrics. The proposed ultra-low cost micro-electro-mechanical sensor would provide, wearable, flexible, textile based biopotential signal recording, wetness detection and tactile sensing simultaneously. Three types of fibers are evaluated for their array-based sensing capability, including a 3D printed conductive fiber, a multiwall carbon nanotube based fiber, and a commercially available stainless steel conductive thread...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28183644/facile-preparation-of-poly-methylene-blue-modified-carbon-paste-electrode-for-the-detection-and-quantification-of-catechin
#9
G Manasa, Ronald J Mascarenhas, Ashis K Satpati, Ozma J D'Souza, A Dhason
Free radicals are formed as byproducts of metabolism, and are highly unstable due to the presence of unpaired electrons. They readily react with other important cellular components such as DNA causing them damage. Antioxidants such as (+)-catechin (CAT), neutralize free radicals in the blood stream. Hence there is a need for detection and quantification of catechin concentration in various food sources and beverages. Electro-oxidative properties of catechin were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV)...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28177156/from-maxwell-s-equations-to-the-theory-of-current-source-density-analysis
#10
Sergey L Gratiy, Geir Halnes, Daniel Denman, Michael J Hawrylycz, Christof Koch, Gaute T Einevoll, Costas A Anastassiou
Despite the widespread use of current-source density (CSD) analysis of extracellular potential recordings in the brain, the physical mechanisms responsible for the generation of the signal are still debated. While the extracellular potential is thought to be exclusively generated by the transmembrane currents, recent studies suggest that extracellular diffusive, advective and displacement currents-traditionally neglected-may also contribute considerably toward extracellular potential recordings. Here, we first justify the application of the electro-quasistatic approximation of Maxwell's equations to describe the electromagnetic field of physiological origin...
February 8, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28168870/annotation-of-functional-impact-of-voltage-gated-sodium-channel-mutations
#11
Valérie Hinard, Aurore Britan, Mathieu Schaeffer, Monique Zahn-Zabal, Urs Thomet, Jean-Sébastien Rougier, Amos Bairoch, Hugues Abriel, Pascale Gaudet
Voltage-gated sodium channels are pore-forming transmembrane proteins that selectively allow sodium ions to flow across the plasma membrane according to the electro-chemical gradient thus mediating the rising phase of action potentials in excitable cells and playing key roles in physiological processes such as neurotransmission, skeletal muscle contraction, heart rhythm and pain sensation. Genetic variations in the nine human genes encoding these channels are known to cause a large range of diseases affecting the nervous and cardiac systems...
February 7, 2017: Human Mutation
https://www.readbyqxmd.com/read/28123904/cryoelectrolysis-electrolytic-processes-in-a-frozen-physiological-saline-medium
#12
Franco Lugnani, Matteo Macchioro, Boris Rubinsky
BACKGROUND: Cryoelectrolysis is a new minimally invasive tissue ablation surgical technique that combines the ablation techniques of electrolytic ablation with cryosurgery. The goal of this study is to examine the hypothesis that electrolysis can take place in a frozen aqueous saline solution. METHOD: To examine the hypothesis we performed a cryoelectrolytic ablation protocol in which electrolysis and cryosurgery are delivered simultaneously in a tissue simulant made of physiological saline gel with a pH dye...
2017: PeerJ
https://www.readbyqxmd.com/read/28113228/variability-of-ventricular-repolarization-dispersion-quantified-by-time-warping-the-morphology-of-the-t-waves
#13
Julia Ramirez, Michele Orini, Derek Tucker, Esther Pueyo, Pablo Laguna
We propose two electrocardiogram (ECG)-derived markers of T-wave morphological variability in the temporal, dw , and amplitude, da , domains. Two additional markers, d(NL)w and d(NL)a , restricted to measure the non-linear information present within dw and da are also proposed. METHODS: We evaluated the accuracy of the proposed markers in capturing T-wave time and amplitude variations in 3 situations: (1) In a simulated set up with presence of additive Laplacian noise, (2) when modifying the spatio-temporal distribution of electrical repolarization with an electro-physiological cardiac model and (3) in ECG records from healthy subjects undergoing a tilt table test...
October 4, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28113196/an-electrochemistry-study-of-cryoelectrolysis-in-frozen-physiological-saline
#14
Thomas Manuel, Pujita Munnangi, Boris Rubinsky
Cryoelectrolysis is a new minimally invasive tissue ablation surgical technique that combines the processes of electrolysis and solid/liquid phase transformation (freezing). This study investigated this new technique by measuring the pH front propagation and the changes in resistance in a tissue simulant made of physiological saline gel with a pH dye as a function of the sample temperature in the high subzero range above the eutectic. Results demonstrated that effective electrolysis can occur in a high subzero freezing milieu and that the propagation of the pH front is only weakly dependent on temperature...
December 15, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28086779/the-effect-of-electrical-conductivity-of-myocardium-on-cardiac-pumping-efficacy-a-computational-study
#15
Ana Rahma Yuniarti, Ki Moo Lim
BACKGROUND AND AIMS: The existence of non-excitable cells in the myocardium leads to the increasing conduction non-uniformity and decreasing myocardial electrical conductivity. Slowed myocardial conduction velocity (MCV) believed to enhance the probability of cardiac arryhthmia and alter the cardiac mechanical pumping efficacy, even in sinus rhythm. Though several studies on the correlation between MCV and cardiac electrical instabilities exist, there has been no study concerning correlation or causality between MCV and cardiac mechanical pumping efficacy, due to the limitation in clinical methods to document and evaluate cardiac mechanical responses directly...
January 10, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28064021/nanosecond-pulsed-electric-field-induced-dose-dependent-phosphatidylinositol-4-5-bisphosphate-signaling-and-intracellular-electro-sensitization
#16
Gleb P Tolstykh, Melissa Tarango, Caleb C Roth, Bennett L Ibey
Previously, it was demonstrated that nanometer-sized pores (nanopores) are formed in outer cellular membranes after exposure to nanosecond electric pulses (nsEPs). We reported that plasma membrane nanoporation affects phospholipids of the cell membrane, culminating in cascading phosphoinositide phosphatidylinositol-4,5-bisphosphate (PIP2) intracellular signaling. In the current study, we show that nsEPs initiated electric field (EF) dose-dependent PIP2 hydrolysis and/or depletion from the plasma membrane. This process was confirmed using fluorescent optical probes of PIP2 hydrolysis: PLCδ-PH-EGFP and GFP-C1-PKCγ-C1a...
January 5, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28041584/hemodynamics-of-his-bundle-pacing
#17
REVIEW
Luca Alberti, Paolo Pieragnoli, Giuseppe Ricciardi, Luigi Padeletti
This review will focus on the feasibility of long term His bundle pacing and its effects on left ventricle (LV) hemodynamics. Compared with right ventricular pacing, His bundle pacing results in a more physiological electro-mechanical activation that contributes to preserve LV function. Moreover some studies showed a similar effect to biventricular pacing in patients with heart failure and left bundle branch block. Recent observations indicate that His bundle pacing should be considered as an optimal site to pace right ventricle in patients who are candidates for cardiac resynchronization therapy...
January 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28010062/covalent-modulators-of-the-vacuolar-atpase
#18
Ying-Chu Chen, Keriann M Backus, Maria Merkulova, Christina Yang, Dennis Brown, Benjamin F Cravatt, Chao Zhang
The vacuolar H(+) ATPase (V-ATPase) is a complex multisubunit machine that regulates important cellular processes through controlling acidity of intracellular compartments in eukaryotes. Existing small-molecule modulators of V-ATPase either are restricted to targeting one membranous subunit of V-ATPase or have poorly understood mechanisms of action. Small molecules with novel and defined mechanisms of inhibition are thus needed to functionally characterize V-ATPase and to fully evaluate the therapeutic relevance of V-ATPase in human diseases...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27965026/disentangling-stimulus-plausibility-and-contextual-congruency-electro-physiological-evidence-for-differential-cognitive-dynamics
#19
Moreno I Coco, Susana Araujo, Karl Magnus Petersson
Expectancy mechanisms are routinely used by the cognitive system in stimulus processing and in anticipation of appropriate responses. Electrophysiology research has documented negative shifts of brain activity when expectancies are violated within a local stimulus context (e.g., reading an implausible word in a sentence) or more globally between consecutive stimuli (e.g., a narrative of images with an incongruent end). In this EEG study, we examine the interaction between expectancies operating at the level of stimulus plausibility and at more global level of contextual congruency to provide evidence for, or against, a disassociation of the underlying processing mechanisms...
February 2017: Neuropsychologia
https://www.readbyqxmd.com/read/27918346/electrical-stimulation-for-seizure-induction-and-functional-mapping-in-stereoelectroencephalography
#20
Agnès Trébuchon, Patrick Chauvel
The challenge in epilepsy surgery is to remove the epileptogenic zone without compromising postoperative function. Electrical stimulation (ES) was developed to identify with greater anatomical and physiological precision cortical structures essential to language and motor function. Because the language network is widely distributed in the left (dominant) hemisphere, and often varies among patients, brain mapping should delineate eloquent areas at the individual level. Although ES for language is commonly performed during a presurgical investigation, the procedure remains nonstandardized among centers, and differences between grids and intracerebral depth electrodes (stereoelectroencephalography) should be taken into account when comparing results from different series...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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