keyword
MENU ▼
Read by QxMD icon Read
search

Electrophysiology

keyword
https://www.readbyqxmd.com/read/28530663/a-cerebellum-like-circuit-in-the-auditory-system-cancels-responses-to-self-generated-sounds
#1
Shobhit Singla, Conor Dempsey, Richard Warren, Armen G Enikolopov, Nathaniel B Sawtell
The dorsal cochlear nucleus (DCN) integrates auditory nerve input with a diverse array of sensory and motor signals processed in circuitry similar to that of the cerebellum. Yet how the DCN contributes to early auditory processing has been a longstanding puzzle. Using electrophysiological recordings in mice during licking behavior, we show that DCN neurons are largely unaffected by self-generated sounds while remaining sensitive to external acoustic stimuli. Recordings in deafened mice, together with neural activity manipulations, indicate that self-generated sounds are cancelled by non-auditory signals conveyed by mossy fibers...
May 22, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28530551/angular-velocity-integration-in-a-fly-heading-circuit
#2
Daniel Turner-Evans, Stephanie Wegener, Hervé Rouault, Romain Franconville, Tanya Wolff, Johannes D Seelig, Shaul Druckmann, Vivek Jayaraman
Many animals maintain an internal representation of their heading as they move through their surroundings. Such a compass representation was recently discovered in a neural population in the Drosophila melanogaster central complex, a brain region implicated in spatial navigation. Here, we use two-photon calcium imaging and electrophysiology in head-fixed walking flies to identify a different neural population that conjunctively encodes heading and angular velocity, and is excited selectively by turns in either the clockwise or counterclockwise direction...
May 22, 2017: ELife
https://www.readbyqxmd.com/read/28530239/thermogenetic-neurostimulation-with-single-cell-resolution
#3
Yulia G Ermakova, Aleksandr A Lanin, Ilya V Fedotov, Matvey Roshchin, Ilya V Kelmanson, Dmitry Kulik, Yulia A Bogdanova, Arina G Shokhina, Dmitry S Bilan, Dmitry B Staroverov, Pavel M Balaban, Andrei B Fedotov, Dmitry A Sidorov-Biryukov, Evgeny S Nikitin, Aleksei M Zheltikov, Vsevolod V Belousov
Thermogenetics is a promising innovative neurostimulation technique, which enables robust activation of neurons using thermosensitive transient receptor potential (TRP) cation channels. Broader application of this approach in neuroscience is, however, hindered by a limited variety of suitable ion channels, and by low spatial and temporal resolution of neuronal activation when TRP channels are activated by ambient temperature variations or chemical agonists. Here, we demonstrate rapid, robust and reproducible repeated activation of snake TRPA1 channels heterologously expressed in non-neuronal cells, mouse neurons and zebrafish neurons in vivo by infrared (IR) laser radiation...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28530225/a-canonical-neural-mechanism-for-behavioral-variability
#4
Ran Darshan, William E Wood, Susan Peters, Arthur Leblois, David Hansel
The ability to generate variable movements is essential for learning and adjusting complex behaviours. This variability has been linked to the temporal irregularity of neuronal activity in the central nervous system. However, how neuronal irregularity actually translates into behavioural variability is unclear. Here we combine modelling, electrophysiological and behavioural studies to address this issue. We demonstrate that a model circuit comprising topographically organized and strongly recurrent neural networks can autonomously generate irregular motor behaviours...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28529762/enhanced-inter-subject-brain-computer-interface-with-associative-sensorimotor-oscillations
#5
Simanto Saha, Khawza I Ahmed, Raqibul Mostafa, Ahsan H Khandoker, Leontios Hadjileontiadis
Electroencephalography (EEG) captures electrophysiological signatures of cortical events from the scalp with high-dimensional electrode montages. Usually, excessive sources produce outliers and potentially affect the actual event related sources. Besides, EEG manifests inherent inter-subject variability of the brain dynamics, at the resting state and/or under the performance of task(s), caused probably due to the instantaneous fluctuation of psychophysiological states. A wavelet coherence (WC) analysis for optimally selecting associative inter-subject channels is proposed here and is being used to boost performances of motor imagery (MI)-based inter-subject brain computer interface (BCI)...
February 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28529391/getting-to-the-heart-of-personality-in-early-childhood-cardiac-electrophysiology-and-stability-of-temperament
#6
Mengjiao Li, Kirby Deater-Deckard, Susan D Calkins, Martha Ann Bell
Can detection of highly stable individual differences in temperament in early childhood be enhanced using measures of resting heart rate (HR) and respiratory sinus arrhythmia (RSA)? The current longitudinal study (N = 216, 50% female; two to four years old) tested the statistical moderating effects of longitudinal change in resting HR and RSA on stability of mother-rated temperament. Children with the smallest decreases in resting HR and smallest increases in resting RSA had the most stable individual differences in effortful control...
April 2017: Journal of Research in Personality
https://www.readbyqxmd.com/read/28529158/evaluation-of-direct-and-cell-mediated-triple-gene-therapy-in-spinal-cord-injury-in-rats
#7
Rustem Robertovich Islamov, Andrey Alexandrovich Izmailov, Mikhail Evgenyevich Sokolov, Philip Olegovich Fadeev, Farid Vagizovich Bashirov, Anton Alexandrovich Eremeev, Gulnara Ferdinantovna Shaymardanova, Maxim Michaylovich Shmarov, Boris Savelyevich Naroditskiy, Yuri Alexandrovich Chelyshev, Igor Aleksandrovich Lavrov, András Palotás
Current treatment options for spinal cord injury (SCI) are scarce. One of the most promising innovative approaches include gene-therapy, however no single gene has so far been shown to be of clinical relevance. This study investigates the efficacy of various combinations of vascular endothelial growth factor (VEGF), glial cell-derived neurotrophic factor (GDNF), angiogenin (ANG) and neuronal cell adhesion molecule (NCAM) in rats. Multiple therapeutic genes were administered intrathecally either via adenoviral vectors or by using genetically modified human umbilical cord blood mononuclear cells (hUCBMCs)...
May 18, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28529059/a-review-of-human-neuroimaging-investigations-involved-with-central-autonomic-regulation-of-baroreflex-mediated-cardiovascular-control
#8
Derek S Kimmerly
Effective regulation of central blood volume and arterial pressure is critical for optimal cardiovascular homeostasis. Inadequate regulation of mean arterial pressure has important pathophysiological implications including syncope, end organ damage, and stroke. Such regulation requires appropriate central integration of barosensory afferents and reflex autonomic control of the heart and blood vessels. The neural pathways involved with the baroreflex include brainstem nuclei that receive modulatory input from higher brain centres...
May 15, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28529011/the-effect-of-in-vivo-created-vascularized-neurotube-on-peripheric-nerve-regeneration
#9
Abdul Kerim Yapici, Yalcin Bayram, Hakan Akgun, Recep Gumus, Fatih Zor
INTRODUCTION: Creating vascularized nerve conduits for treatment of nerve gaps have been researched, however, these methods need microsurgical anastomosis thereby complicating the nerve repair process. Thus, the concept of vascularized nerve conduits has not popularized up till now. The aim of this study is to evaluate the effects of vascularized and non-vascularized biological conduits on peripheral nerve regeneration. MATERIAL AND METHODS: Following ethical board approval, 15 Sprague-Dawley rats were used in the study...
May 11, 2017: Injury
https://www.readbyqxmd.com/read/28528905/a-pheromone-antagonist-regulates-optimal-mating-time-in-the-moth-helicoverpa-armigera
#10
Hetan Chang, Yang Liu, Dong Ai, Xingchuan Jiang, Shuanglin Dong, Guirong Wang
Many insect species use multi-component sex pheromones to discriminate among potential mating partners [1-5]. In moths, pheromone blends tend to be dominated by one or two major components, but behavioral responses are frequently optimized by the inclusion of less abundant minor components [6]. An increasing number of studies have shown that female insects use these chemicals to convey their mating availability to males, who can assess the maturity of females and thus decide when to mate [7, 8]. However, little is known about the biological mechanisms that enable males to assess female reproductive status...
May 17, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28528848/temporal-expectancies-driven-by-self-and-externally-generated-rhythms
#11
Alexander Jones, Yi-Fang Hsu, Lionel Granjon, Florian Waszak
The dynamic attending theory proposes that rhythms entrain periodic fluctuations of attention which modulate the gain of sensory input. However, temporal expectancies can also be driven by the mere passage of time (foreperiod effect). It is currently unknown how these two types of temporal expectancy relate to each other, i.e. whether they work in parallel and have distinguishable neural signatures. The current research addresses this issue. Participants either tapped a 1Hz rhythm (active task) or were passively presented with the same rhythm using tactile stimulators (passive task)...
May 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28527890/mechano-electric-coupling-heterogeneity-in-repolarization-and-the-electrocardiographic-t-wave
#12
REVIEW
V M F Meijborg, C N W Belterman Va, J M T de Bakker, R Coronel, C E Conrath
Stretch influences repolarization by mechano-electric coupling (MEC) and contributes to arrhythmogenesis. Although there is an abundance of research on electrophysiological effects of MEC, it is still unclear how MEC translates to the ECG. We aim to provide an overview of the MEC research focused on the ECG and the underlying changes in electrophysiology. In addition, we present new data on the effect of left ventricular pressure on the electrocardiographic T-wave. We show that an increase in left ventricular pressure leads to prolonged QT-intervals with increased amplitudes of the STT-segment...
May 17, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28527317/fully-automatic-segmentation-of-left-ventricular-anatomy-in-3-d-lge-mri
#13
Tanja Kurzendorfer, Christoph Forman, Michaela Schmidt, Christoph Tillmanns, Andreas Maier, Alexander Brost
The current challenge for electrophysiology procedures, targeting the left ventricle, is the localization and qualification of myocardial scar. Late gadolinium enhanced magnetic resonance imaging (LGE-MRI) is the current gold standard to visualize regions of myocardial infarction. Commonly, a stack of 2-D images is acquired of the left ventricle in short-axis orientation. Recently, 3-D LGE-MRI methods were proposed that continuously cover the whole heart with a high resolution within a single acquisition. The acquisition promises an accurate quantification of the myocardium to the extent of myocardial scarring...
May 8, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28527237/the-n-terminus-of-the-prion-protein-is-a-toxic-effector-regulated-by-the-c-terminus
#14
Bei Wu, Alex McDonald, Markham Kathleen, Celeste B Rich, Kyle P Mchugh, Jörg Tatzelt, Colby David, Glenn L Millhauser, David Harris
PrP(C), the cellular isoform of the prion protein, serves to transduce the neurotoxic effects of PrP(Sc), the infectious isoform, but how this occurs is mysterious. Here, using a combination of electrophysiological, cellular, and biophysical techniques, we show that the flexible, N-terminal domain of PrP(C) functions as a powerful toxicity-transducing effector whose activity is tightly regulated in cis by the globular C-terminal domain. Ligands binding to the N-terminal domain abolish the spontaneous ionic currents associated with neurotoxic mutants of PrP, and the isolated N-terminal domain induces currents when expressed in the absence of the C-terminal domain...
May 20, 2017: ELife
https://www.readbyqxmd.com/read/28526877/magnetospinography-visualizes-electrophysiological-activity-in-the-cervical-spinal-cord
#15
Satoshi Sumiya, Shigenori Kawabata, Yuko Hoshino, Yoshiaki Adachi, Kensuke Sekihara, Shoji Tomizawa, Masaki Tomori, Senichi Ishii, Kyohei Sakaki, Dai Ukegawa, Shuta Ushio, Taishi Watanabe, Atsushi Okawa
Diagnosis of nervous system disease is greatly aided by functional assessments and imaging techniques that localize neural activity abnormalities. Electrophysiological methods are helpful but often insufficient to locate neural lesions precisely. One proposed noninvasive alternative is magnetoneurography (MNG); we have developed MNG of the spinal cord (magnetospinography, MSG). Using a 120-channel superconducting quantum interference device biomagnetometer system in a magnetically shielded room, cervical spinal cord evoked magnetic fields (SCEFs) were recorded after stimulation of the lower thoracic cord in healthy subjects and a patient with cervical spondylotic myelopathy and after median nerve stimulation in healthy subjects...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526621/electrophysiological-signatures-of-phonological-and-semantic-maintenance-in-sentence-repetition
#16
Jed A Meltzer, Aneta Kielar, Lilia Panamsky, Kira A Links, Tiffany Deschamps, Rosie C Leigh
Verbal short-term memory comprises resources for phonological rehearsal, which have been characterized anatomically, and for maintenance of semantic information, which are less understood. Sentence repetition tasks tap both processes interactively. To distinguish brain activity involved in phonological vs. semantic maintenance, we recorded magnetoencephalography during a sentence repetition task, incorporating three manipulations emphasizing one mechanism over the other. Participants heard sentences or word lists and attempted to repeat them verbatim after a 5-second delay...
May 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28526554/the-roles-of-orexins-in-sleep-wake-regulation
#17
REVIEW
Michihiro Mieda
Orexin A and orexin B are hypothalamic neuropeptides initially identified as endogenous ligands for two orphan G-protein coupled receptors (GPCRs). A deficiency of orexin signaling results in the sleep disorder narcolepsy-cataplexy in humans, dogs, and rodents, a sleep disorder characterized by excessive daytime sleepiness and cataplexy. Multiple approaches, including molecular genetic, electrophysiological, pharmacological, and neuroanatomical studies have suggested that orexins play critical roles in the maintenance of wakefulness by regulating the function of monoaminergic and cholinergic neurons that are implicated in the regulation of wakefulness...
May 16, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28525682/secondary-sulcus-fixed-foldable-iol-implantation-with-25-g-infusion-in-patients-with-previous-ppv-after-open-globe-injury
#18
Tiangeng He, Caiyun You, Song Chen, Xiangda Meng, Yuanyuan Liu, Hua Yan
PURPOSE: To evaluate the safety and efficacy of secondary sulcus-fixed foldable intraocular lens (IOL) implantation through a clear corneal incision with 25-G infusion in patients with previous pars plana vitrectomy (PPV) after open-globe injury, and to analyze postoperative outcomes and prognostic factors of treatment. METHODS: Clinical data of 89 eyes of 89 patients with open-globe injury who underwent secondary sulcus-fixed foldable IOL implantation through a clear corneal incision with 25-G infusion after vitrectomy in our hospital between January 2008 and June 2015 were retrospectively analyzed...
May 16, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28525585/the-effects-of-gender-on-electrical-therapies-for-the-heart-physiology-epidemiology-and-access-to-therapies-a-report-from-the-xii-congress-of-the-italian-association-on-arrhythmology-and-cardiostimulation-aiac
#19
Giuseppe Boriani, Stefano Lorenzetti, Elisabetta Cerbai, Giuseppe Oreto, Gabriele Bronzetti, Vincenzo Livio Malavasi, Alessandro Biffi, Luigi Padeletti, Gianluca Botto, Igor Diemberger
The difference between men and women is clear even just by looking at an electrocardiogram: females present higher resting heart rate, a shorter QRS complex length and greater corrected QT interval. The development of these differences from pubertal age onward suggests that sexual hormones play a key role, although their effect is far from being completely understood. Different incidences between sexes have been reported for many arrhythmias, both ventricular and supraventricular, and also for sudden cardiac death...
May 19, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28525289/high-throughput-phenotyping-of-human-induced-pluripotent-stem-cell-derived-cardiomyocytes-and-neurons-using-electric-field-stimulation-and-high-speed-fluorescence-imaging
#20
Neil J Daily, Zhong-Wei Du, Tetsuro Wakatsuki
Electrophysiology of excitable cells, including muscle cells and neurons, has been measured by making direct contact with a single cell using a micropipette electrode. To increase the assay throughput, optical devices such as microscopes and microplate readers have been used to analyze electrophysiology of multiple cells. We have established a high-throughput (HTP) analysis of action potentials (APs) in highly enriched motor neurons and cardiomyocytes (CMs) that are differentiated from human induced pluripotent stem cells (iPSCs)...
May 19, 2017: Assay and Drug Development Technologies
keyword
keyword
393
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"