keyword
MENU ▼
Read by QxMD icon Read
search

imaging AND awake

keyword
https://www.readbyqxmd.com/read/28819211/dynamic-local-connectivity-uncovers-altered-brain-synchrony-during-propofol-sedation
#1
Rose Dawn Bharath, Rajanikant Panda, Jitender Saini, Kamath Sriganesh, G S Umamaheswara Rao
Human consciousness is considered a result of the synchronous "humming" of multiple dynamic networks. We performed a dynamic functional connectivity analysis using resting state functional magnetic resonance imaging (rsfMRI) in 14 patients before and during a propofol infusion to characterize the sedation-induced alterations in consciousness. A sliding 36-second window was used to derive 59 time points of whole brain integrated local connectivity measurements. Significant changes in the connectivity strength (Z Corr) at various time points were used to measure the connectivity fluctuations during awake and sedated states...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28794407/focal-cortical-seizures-start-as-standing-waves-and-propagate-respecting-homotopic-connectivity
#2
L Federico Rossi, Robert C Wykes, Dimitri M Kullmann, Matteo Carandini
Focal epilepsy involves excessive cortical activity that propagates both locally and distally. Does this propagation follow the same routes as normal cortical activity? We pharmacologically induced focal seizures in primary visual cortex (V1) of awake mice, and compared their propagation to the retinotopic organization of V1 and higher visual areas. We used simultaneous local field potential recordings and widefield imaging of a genetically encoded calcium indicator to measure prolonged seizures (ictal events) and brief interictal events...
August 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28755982/use-and-perceptions-of-caffeinated-energy-drinks-and-energy-shots-in-canada
#3
Danielle Wiggers, Jessica L Reid, Christine M White, David Hammond
INTRODUCTION: In Canada, energy drinks and energy shots are currently classified and regulated differently (food and drugs versus natural health products, respectively), on the assumption that they are used and perceived differently. The current study examined potential differences in use and perceptions of energy drinks and shots. METHODS: An online survey was conducted in 2015 using a national commercial online panel of youth and young adults aged 12-24 years (n=2,040 retained for analysis in 2016)...
July 26, 2017: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28747086/menthol-enhances-nicotine-induced-locomotor-sensitization-and-in-vivo-functional-connectivity-in-adolescence
#4
Matthew F Thompson, Guillaume L Poirier, Martha I Dávila-García, Wei Huang, Kelly Tam, Maxwell Robidoux, Michelle L Dubuke, Scott A Shaffer, Luis Colon-Perez, Marcelo Febo, Joseph R DiFranza, Jean A King
Mentholated cigarettes capture a quarter of the US market, and are disproportionately smoked by adolescents. Menthol allosterically modulates nicotinic acetylcholine receptor function, but its effects on the brain and nicotine addiction are unclear. To determine if menthol is psychoactive, we assessed locomotor sensitization and brain functional connectivity. Adolescent male Sprague Dawley rats were administered nicotine (0.4 mg/kg) daily with or without menthol (0.05 mg/kg or 5.38 mg/kg) for nine days. Following each injection, distance traveled in an open field was recorded...
July 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28744474/erratum-genetically-expressed-voltage-sensor-arclight-for-imaging-large-scale-cortical-activity-in-the-anesthetized-and-awake-mouse-erratum
#5
Peter Y Borden, Alex D Ortiz, Christian Waiblinger, Audrey J Sederberg, Arthur E Morrissette, Craig R Forest, Dieter Jaeger, Garrett B Stanley
[This corrects the article DOI: 10.1117/1.NPh.4.3.031212.].
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28737365/vim-thalamotomy-in-the-treatment-of-holmes-tremor-secondary-to-hiv-associated-midbrain-lesion-a-case-report
#6
José O Oliveira, Soraya A Jorge Cecilio, Matheus Fernandes Oliveira, Leonardo R Takahashi, Alexandro R Galassi, Vanessa M Holanda, José M Rotta
Holmes' tremor (rubral tremor, cerebellar outflow tremor) is characterized by rest, intention and postural tremor, often localized to one upper extremity, associated with ipsilateral dysmetria and dysdiadochokinesia. We describe a case of successful treatment of Holmes' tremor with unilateral nucleus ventralis intermedius (VIM) thalamotomy. The subject is a 43-year-old woman with unremarkable previous medical history. She presented with complete left hemiparesis in the context of human immunodeficiency syndrome and the magnetic resonance image disclosed a contrast-enhancing lesion in right brain peduncle, in topography of red nucleus...
October 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28736672/handheld-optical-coherence-tomography-angiography
#7
Jianlong Yang, Liang Liu, J Peter Campbell, David Huang, Gangjun Liu
We developed a handheld optical coherence tomography angiography (OCTA) system using a 100-kHz swept-source laser. The handheld probe weighs 0.4 kg and measures 20.6 × 12.8 × 4.6 cm(3). The system has dedicated features for handheld operation. The probe is equipped with a mini iris camera for easy alignment. Real-time display of the en face OCT and cross-sectional OCT images in the system allows accurately locating the imaging target. Fast automatic focusing was achieved by an electrically tunable lens controlled by a golden-section search algorithm...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28735717/real-time-cineangiography-visualization-of-cerebral-aneurysm-rupture-in-an-awake-patient-anatomic-physiological-and-functional-correlates
#8
Tasha L Welch, Waleed Brinjikji, Guiseppe Lanzino, William L Lanier
Intracranial aneurysms are common and, on a population-based perspective, are a major cause of morbidity and mortality as a result of mass effect or rupture. Cerebral angiography is the primary technique used for the diagnosis of cerebral aneurysms, and the imaging data have additional utility for planning medical, endovascular, or surgical treatments. An extremely rare periprocedural complication of cerebral angiography is rupture of the aneurysm, either as a chance phenomenon or as a result of some physiologic change or mechanical effect...
July 20, 2017: Mayo Clinic Proceedings
https://www.readbyqxmd.com/read/28721356/targeted-ischemic-stroke-induction-and-mesoscopic-imaging-assessment-of-blood-flow-and-ischemic-depolarization-in-awake-mice
#9
Matilde Balbi, Matthieu P Vanni, Gergely Silasi, Yuki Sekino, Luis Bolanos, Jeffrey M LeDue, Timothy H Murphy
Despite advances in experimental stroke models, confounding factors such as anesthetics used during stroke induction remain. Furthermore, imaging of blood flow during stroke is not routinely done. We take advantage of in vivo bihemispheric transcranial windows for longitudinal mesoscopic imaging of cortical function to establish a protocol for focal ischemic stroke induction in target brain regions using photothrombosis in awake head-fixed mice. Our protocol does not require any surgical steps at the time of stroke induction or anesthetics during either head fixation or photoactivation...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28712063/resisting-sleep-pressure-impact-on-resting-state-functional-network-connectivity
#10
Laura Tüshaus, Joshua Henk Balsters, Anthony Schläpfer, Daniel Brandeis, Ruth O'Gorman Tuura, Peter Achermann
In today's 24/7 society, sleep restriction is a common phenomenon which leads to increased levels of sleep pressure in daily life. However, the magnitude and extent of impairment of brain functioning due to increased sleep pressure is still not completely understood. Resting state network (RSN) analyses have become increasingly popular because they allow us to investigate brain activity patterns in the absence of a specific task and to identify changes under different levels of vigilance (e.g. due to increased sleep pressure)...
July 15, 2017: Brain Topography
https://www.readbyqxmd.com/read/28689982/network-level-control-of-frequency-tuning-in-auditory-cortex
#11
Hiroyuki K Kato, Samuel K Asinof, Jeffry S Isaacson
Lateral inhibition is a fundamental circuit operation that sharpens the tuning properties of cortical neurons. This operation is classically attributed to an increase in GABAergic synaptic input triggered by non-preferred stimuli. Here we use in vivo whole-cell recording and two-photon Ca(2+) imaging in awake mice to show that lateral inhibition shapes frequency tuning in primary auditory cortex via an unconventional mechanism: non-preferred tones suppress both excitatory and inhibitory synaptic inputs onto layer 2/3 cells ("network suppression")...
July 19, 2017: Neuron
https://www.readbyqxmd.com/read/28680907/visual-stimulation-quenches-global-alpha-range-activity-in-awake-primate-v4-a-case-study
#12
Thomas Deneux, Timothée Masquelier, Maria A Bermudez, Guillaume S Masson, Gustavo Deco, Ivo Vanzetta
Increasing evidence suggests that sensory stimulation not only changes the level of cortical activity with respect to baseline but also its structure. Despite having been reported in a multitude of conditions and preparations (for instance, as a quenching of intertrial variability, Churchland et al., 2010), such changes remain relatively poorly characterized. Here, we used optical imaging of voltage-sensitive dyes to explore, in V4 of an awake macaque, the spatiotemporal characteristics of both visually evoked and spontaneously ongoing neuronal activity and their difference...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28674167/mesoscale-mapping-of-mouse-cortex-reveals-frequency-dependent-cycling-between-distinct-macroscale-functional-modules
#13
Matthieu P Vanni, Allen W Chan, Matilde Balbi, Gergely Silasi, Timothy H Murphy
Connectivity mapping based on resting state activity in mice has revealed functional motifs of correlated activity. However, the rules by which motifs organize into larger functional modules that lead to hemisphere wide spatial-temporal activity sequences is not clear. We explore cortical activity parcellation in head-fixed, quiet awake GCaMP6 mice from both sexes by using mesoscopic calcium imaging. Spectral decomposition of spontaneous cortical activity revealed the presence of two dominant frequency modes (<1Hz and ∼3Hz), each of them associated with a unique spatial signature of cortical macro-parcellation not predicted by classical cytoarchitectonic definitions of cortical areas...
July 3, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28663893/functional-imaging-of-neuronal-activity-of-auditory-cortex-by-using-cal-520-in-anesthetized-and-awake-mice
#14
Jingcheng Li, Jianxiong Zhang, Meng Wang, Junxia Pan, Xiaowei Chen, Xiang Liao
The organization in the primary auditory cortex (Au1) is critical to the basic function of auditory information processing and integration. However, recent mapping experiments using in vivo two-photon imaging with different Ca(2+) indicators have reached controversial conclusions on this topic, possibly because of the different sensitivities and properties of the indicators used. Therefore, it is essential to identify a reliable Ca(2+) indicator for use in in vivo functional imaging of the Au1, to understand its functional organization...
May 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28659792/the-serotonin-receptor-6-antagonist-idalopirdine-and-acetylcholinesterase-inhibitor-donepezil-have-synergistic-effects-on-brain-activity-a-functional-mri-study-in-the-awake-rat
#15
Craig F Ferris, Praveen Kulkarni, Jason R Yee, Mark Nedelman, Inge E M de Jong
The 5-HT6 receptor is a promising target for cognitive disorders, in particular for Alzheimer's disease (AD) and other CNS disorders. The high-affinity and selective 5-HT6 receptor antagonist idalopirdine (Lu AE58054) is currently in development for mild-moderate AD as adjunct therapy to acetylcholinesterase inhibitors (AChEIs). We studied the effects of idalopirdine alone and in combination with the AChEI donepezil on brain activity using BOLD (Blood Oxygen Level Dependent) functional magnetic resonance imaging (fMRI) in the awake rat...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28658617/reliable-and-elastic-propagation-of-cortical-seizures-in%C3%A2-vivo
#16
Michael Wenzel, Jordan P Hamm, Darcy S Peterka, Rafael Yuste
Mapping the fine-scale neural activity that underlies epilepsy is key to identifying potential control targets of this frequently intractable disease. Yet, the detailed in vivo dynamics of seizure progression in cortical microcircuits remain poorly understood. We combine fast (30-Hz) two-photon calcium imaging with local field potential (LFP) recordings to map, cell by cell, the spread of locally induced (4-AP or picrotoxin) seizures in anesthetized and awake mice. Using single-layer and microprism-assisted multilayer imaging in different cortical areas, we uncover reliable recruitment of local neural populations within and across cortical layers, and we find layer-specific temporal delays, suggesting an initial supra-granular invasion followed by deep-layer recruitment during lateral seizure spread...
June 27, 2017: Cell Reports
https://www.readbyqxmd.com/read/28654383/brain-and-brown-adipose-tissue-metabolism-in-transgenic-tg2576-mice-models-of-alzheimer-disease-assessed-using-18-f-fdg-pet-imaging
#17
Robert A Coleman, Christopher Liang, Rima Patel, Sarah Ali, Jogeshwar Mukherjee
OBJECTIVE: Imaging animal models of Alzheimer disease (AD) is useful for the development of therapeutic drugs and understanding AD. Transgenic Swedish hAPPswe Tg2576 mice are a good model of β-amyloid plaques. We report (18)F-fluoro-2-deoxyglucose ((18)F-FDG) positron emission tomography (PET) imaging of brain and intrascapular brown adipose tissue (IBAT) in transgenic mice 2576 (Tg2576) and wild-type (WT) mice. METHODS: Transgenic Tg2576 mice and WT mice, >18 months were injected intraperitonally with ≈ 25 to 30 MBq (18)F-FDG while awake...
January 1, 2017: Molecular Imaging
https://www.readbyqxmd.com/read/28643823/-chewing-on-bruxism-diagnosis-imaging-epidemiology-and-aetiology
#18
F Lobbezoo, R Jacobs, A De Laat, G Aarab, P Wetselaar, D Manfredini
Since the publication of a special issue on bruxism of the NTvT in July 2000, consensus has been reached on bruxism's definition as a repetitive masticatory muscle activity that is characterised by clenching and/or grinding while awake (awake bruxism) or during sleep (sleep bruxism). As yet, however, no consensus exists about the diagnosis of bruxism: sufficient evidence to establish the reliability and validity of the commonly used techniques (self-report, clinical examination, imaging, electromyography, polysomnography) has not yet been produced...
June 2017: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/28634149/a-non-invasive-restraining-system-for-awake-mouse-imaging
#19
Dan Madularu, Axel P Mathieu, Chathura Kumaragamage, Lauren M Reynolds, Jamie Near, Cecilia Flores, M Natasha Rajah
BACKGROUND: Preclinical neuroimaging allows for the assessment of brain anatomy, connectivity and function in laboratory animals, such as mice and rats. Most of these studies are performed under anesthesia to avoid movement during the scanning sessions. METHOD: Due to the limitations associated with anesthetized imaging, recent efforts have been made to conduct rodent imaging studies in awake animals, habituated to the restraint systems used in these instances. As of now, only one such system is commercially available for mouse scanning (Animal Imaging Research, Boston, MA, USA) integrating the radiofrequency coil electronics with the restraining element, an approach which, although effective in reducing head motion during awake imaging, has some limitations...
June 17, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28615151/parkinson-s-disease-patient-preference-and-experience-with-various-methods-of-dbs-lead-placement
#20
Sara C LaHue, Jill L Ostrem, Nicholas B Galifianakis, Marta San Luciano, Nathan Ziman, Sarah Wang, Caroline A Racine, Philip A Starr, Paul S Larson, Maya Katz
INTRODUCTION: Physiology-guided deep brain stimulation (DBS) surgery requires patients to be awake during a portion of the procedure, which may be poorly tolerated. Interventional MRI-guided (iMRI) DBS surgery was developed to use real-time image guidance, obviating the need for patients to be awake during lead placement. METHODS: All English-speaking adults with PD who underwent iMRI DBS between 2010 and 2014 at our Center were invited to participate. Subjects completed a structured interview that explored perioperative preferences and experiences...
April 17, 2017: Parkinsonism & related Disorders
keyword
keyword
38014
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"