keyword
MENU ▼
Read by QxMD icon Read
search

memory implant

keyword
https://www.readbyqxmd.com/read/28434860/direct-brain-stimulation-modulates-encoding-states-and-memory-performance-in-humans
#1
Youssef Ezzyat, James E Kragel, John F Burke, Deborah F Levy, Anastasia Lyalenko, Paul Wanda, Logan O'Sullivan, Katherine B Hurley, Stanislav Busygin, Isaac Pedisich, Michael R Sperling, Gregory A Worrell, Michal T Kucewicz, Kathryn A Davis, Timothy H Lucas, Cory S Inman, Bradley C Lega, Barbara C Jobst, Sameer A Sheth, Kareem Zaghloul, Michael J Jutras, Joel M Stein, Sandhitsu R Das, Richard Gorniak, Daniel S Rizzuto, Michael J Kahana
People often forget information because they fail to effectively encode it. Here, we test the hypothesis that targeted electrical stimulation can modulate neural encoding states and subsequent memory outcomes. Using recordings from neurosurgical epilepsy patients with intracranially implanted electrodes, we trained multivariate classifiers to discriminate spectral activity during learning that predicted remembering from forgetting, then decoded neural activity in later sessions in which we applied stimulation during learning...
April 13, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28417536/stretchable-and-soft-electronics-using-liquid-metals
#2
REVIEW
Michael D Dickey
The use of liquid metals based on gallium for soft and stretchable electronics is discussed. This emerging class of electronics is motivated, in part, by the new opportunities that arise from devices that have mechanical properties similar to those encountered in the human experience, such as skin, tissue, textiles, and clothing. These types of electronics (e.g., wearable or implantable electronics, sensors for soft robotics, e-skin) must operate during deformation. Liquid metals are compelling materials for these applications because, in principle, they are infinitely deformable while retaining metallic conductivity...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28417025/dorsal-phalloplasty-to-preserve-penis-length-after-penile-prosthesis-implantation
#3
Osama Shaeer, Kamal Shaeer, Islam A Rahman
OBJECTIVES: Following penile prosthesis implantation (PPI), patients may complain of a decrease in visible penis length. A dorsal phalloplasty defines the penopubic junction by tacking pubic skin to the pubis, revealing the base of the penis. This study aimed to evaluate the efficacy of a dorsal phalloplasty in increasing the visible penis length following PPI. METHODS: An inflatable penile prosthesis was implanted in 13 patients with severe erectile dysfunction (ED) at the Kamal Shaeer Hospital, Cairo, Egypt, from January 2013 to May 2014...
February 2017: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/28396399/context-dependent-spatially-periodic-activity-in-the-human-entorhinal-cortex
#4
Zoltan Nadasdy, T Peter Nguyen, Ágoston Török, Jason Y Shen, Deborah E Briggs, Pradeep N Modur, Robert J Buchanan
The spatially periodic activity of grid cells in the entorhinal cortex (EC) of the rodent, primate, and human provides a coordinate system that, together with the hippocampus, informs an individual of its location relative to the environment and encodes the memory of that location. Among the most defining features of grid-cell activity are the 60° rotational symmetry of grids and preservation of grid scale across environments. Grid cells, however, do display a limited degree of adaptation to environments. It remains unclear if this level of environment invariance generalizes to human grid-cell analogs, where the relative contribution of visual input to the multimodal sensory input of the EC is significantly larger than in rodents...
April 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28396186/-eight-days-of-nightmares-%C3%A2-octogenarian-patients-experiences-of-postoperative-delirium-after-transcatheter-or-surgical-aortic-valve-replacement
#5
Irene Instenes, Eva Gjengedal, Leslie S P Eide, Karel K J Kuiper, Anette H Ranhoff, Tone M Norekvål
BACKGROUND: Surgical aortic valve replacement (SAVR) and transcatheter aortic valve implantation (TAVI) are increasingly performed in octogenarian patients with severe aortic stenosis (AS), including those with high surgical risk. Postoperative delirium (PD) is a common and serious complication in older patients, characterised by reduced awareness, change in consciousness, disturbance in logical thinking and hallucinations. METHODS: To explore how octogenarian patients experienced PD, a qualitative study was conducted including five women and five men between 81 and 88 years...
March 20, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28386925/vagus-nerve-stimulation-surgical-technique-of-implantation-and-revision-and-related-morbidity
#6
Flavio Giordano, Anna Zicca, Carmen Barba, Renzo Guerrini, Lorenzo Genitori
Indications for vagus nerve stimulation (VNS) therapy include focal, multifocal epilepsy, drop attacks (tonic/atonic seizures), Lennox-Gastaut syndrome, tuberous sclerosis complex (TSC)-related multifocal epilepsy, and unsuccessful resective surgery. Surgical outcome is about 50-60% for seizures control, and may also improve mood, cognition, and memory. On this basis, VNS has also been proposed for the treatment of major depression and Alzheimer's' disease. The vagus nerve stimulator must be implanted with blunt technique on the left side to avoid cardiac side effects through the classic approach for anterior cervical discectomy...
April 2017: Epilepsia
https://www.readbyqxmd.com/read/28384805/speech-recognition-in-adults-with-cochlear-implants-the-effects-of-working-memory-phonological-sensitivity-and-aging
#7
Aaron C Moberly, Michael S Harris, Lauren Boyce, Susan Nittrouer
Purpose: Models of speech recognition suggest that "top-down" linguistic and cognitive functions, such as use of phonotactic constraints and working memory, facilitate recognition under conditions of degradation, such as in noise. The question addressed in this study was what happens to these functions when a listener who has experienced years of hearing loss obtains a cochlear implant. Method: Thirty adults with cochlear implants and 30 age-matched controls with age-normal hearing underwent testing of verbal working memory using digit span and serial recall of words...
April 4, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28377210/similar-patterns-of-neural-activity-predict-memory-function-during-encoding-and-retrieval
#8
James E Kragel, Youssef Ezzyat, Michael R Sperling, Richard Gorniak, Gregory A Worrell, Brent M Berry, Cory Inman, Jui-Jui Lin, Kathryn A Davis, Sandhitsu R Das, Joel M Stein, Barbara C Jobst, Kareem A Zaghloul, Sameer A Sheth, Daniel S Rizzuto, Michael J Kahana
Neural networks that span the medial temporal lobe (MTL), prefrontal cortex, and posterior cortical regions are essential to episodic memory function in humans. Encoding and retrieval are supported by the engagement of both distinct neural pathways across the cortex and common structures within the medial temporal lobes. However, the degree to which memory performance can be determined by neural processing that is common to encoding and retrieval remains to be determined. To identify neural signatures of successful memory function, we administered a delayed free-recall task to 187 neurosurgical patients implanted with subdural or intraparenchymal depth electrodes...
April 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/28362398/automatic-detection-of-highly-organized-theta-oscillations-in-the-murine-eeg
#9
Ralf Müller, Anna Papazoglou, Julien Soos, Andreas Lundt, Carola Wormuth, Christina Henseler, Dan Ehninger, Karl Broich, Marco Weiergräber
Theta activity is generated in the septohippocampal system and can be recorded using deep intrahippocampal electrodes and implantable electroencephalography (EEG) radiotelemetry or tether system approaches. Pharmacologically, hippocampal theta is heterogeneous (see dualistic theory) and can be differentiated into type I and type II theta. These individual EEG subtypes are related to specific cognitive and behavioral states, such as arousal, exploration, learning and memory, higher integrative functions, etc...
March 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28341611/extinction-memory-is-facilitated-by-methylphenidate-and-regulated-by-dopamine-and-noradrenaline-receptors
#10
Cristiane R G Furini, Jonny A K Behling, Carolina G Zinn, Mara Lise Zanini, Eduardo Assis Brasil, Luiza Doro Pereira, Ivan Izquierdo, Jociane de Carvalho Myskiw
Extinction is defined as the learned inhibition of retrieval and is the mainstay of exposure therapy, which is widely used to treat drug addiction, phobias and fear disorders. The psychostimulant, methylphenidate (MPH) is known to increase extracellular levels of noradrenaline and dopamine by blocking their reuptake and studies have demonstrated that MPH can modulate hippocampal physiology and/or functions including long-term potentiation (LTP), learning and memory. However, the influence of MPH on fear extinction memory has been insufficiently studied...
March 21, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28336569/cued-memory-retrieval-exhibits-reinstatement-of-high-gamma-power-on-a-faster-timescale-in-the-left-temporal-lobe-and-prefrontal-cortex
#11
Robert B Yaffe, Ammar Shaikhouni, Jennifer Arai, Sara K Inati, Kareem A Zaghloul
Converging evidence suggests that reinstatement of neural activity underlies our ability to successfully retrieve memories. However, the temporal dynamics of reinstatement in the human cortex remain poorly understood. One possibility is that neural activity during memory retrieval, like replay of spiking neurons in the hippocampus, occurs at a faster timescale than during encoding. We tested this hypothesis in 34 participants who performed a verbal episodic memory task while we recorded high gamma (62-100 Hz) activity from subdural electrodes implanted for seizure monitoring...
March 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28335695/impact-of-cognition-and-noise-reduction-on-speech-perception-in-adults-with-unilateral-cochlear-implants
#12
Suzanne Carolyn Purdy, David Welch, Ellen Giles, Catherine Louise Anne Morgan, Renique Tenhagen, Abin Kuruvilla-Mathew
OBJECTIVES: The purpose of this study was to investigate the impact of cognition and noise reduction (NR) technology in cochlear implants (CIs) on speech perception and listening effort. METHODS: Thirteen adults fitted with unilateral CIs (Nucleus(®) 6, CP900) participated in this study. Participants performed: (I) cognitive tests of working memory and processing speed, (II) speech perception in noise tests, and (III) an auditory-visual dual-task paradigm to quantify listening effort, as a part of the three-phase experimental study...
March 24, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28335018/dissecting-gamma-frequency-activity-during-human-memory-processing
#13
Michal T Kucewicz, Brent M Berry, Vaclav Kremen, Benjamin H Brinkmann, Michael R Sperling, Barbara C Jobst, Robert E Gross, Bradley Lega, Sameer A Sheth, Joel M Stein, Sandthitsu R Das, Richard Gorniak, S Matthew Stead, Daniel S Rizzuto, Michael J Kahana, Gregory A Worrell
Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not clear, however, which processes contribute to human brain gamma frequency activity, or their dynamics and roles during memory processing...
March 13, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28333145/the-cryo-thermal-therapy-eradicated-melanoma-in-mice-by-eliciting-cd4-t-cell-mediated-antitumor-memory-immune-response
#14
Kun He, Ping Liu, Lisa X Xu
Tumor metastasis is a major concern in tumor therapy. In our previous studies, a novel tumor therapeutic modality of the cryo-thermal therapy has been presented, highlighting its effect on the suppression of distal metastasis and leading to long-term survival in 4T1 murine mammary carcinoma model. To demonstrate the therapeutic efficacy in other aggressive tumor models and further investigate the mechanism of long-term survival induced, in this study, spontaneous metastatic murine B16F10 melanoma model was used...
March 23, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28306221/construction-of-small-diameter-vascular-graft-by-shape-memory-and-self-rolling-bacterial-cellulose-membrane
#15
Ying Li, Kai Jiang, Jian Feng, Jinzhe Liu, Rong Huang, Zhaojun Chen, Junchuan Yang, Zhaohe Dai, Yong Chen, Nuoxin Wang, Wenjin Zhang, Wenfu Zheng, Guang Yang, Xingyu Jiang
Bacterial cellulose (BC) membranes with shape-memory properties allow the rapid preparation of artificial small-diameter blood vessels when combined with microfluidics-based patterning with multiple types of cells. Lyophilization of a wet multilayered rolled BC tube endows it with memory to recover its tubular shape after unrolling. The unrolling of the BC tube yields a flat membrane, and subsequent patterning with endothelial cells, smooth muscle cells, and fibroblast cells is carried out by microfluidics...
March 17, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28296559/the-irony-of-highly-effective-bacterial-therapy-of-a-patient-derived-orthotopic-xenograft-pdox-model-of-ewing-s-sarcoma-which-was-blocked-by-ewing-himself-80%C3%A2-years-ago
#16
Takashi Murakami, Tasuku Kiyuna, Kei Kawaguchi, Kentaro Igarashi, Arun S Singh, Yukihiko Hiroshima, Yong Zhang, Ming Zhao, Kentaro Miyake, Scott D Nelson, Sarah M Dry, Yunfeng Li, Jonathan C DeLong, Thinzar M Lwin, Takashi Chishima, Kuniya Tanaka, Michael Bouvet, Itaru Endo, Fritz C Eilber, Robert M Hoffman
William B. Coley developed bacterial therapy of cancer more than 100 years ago and had clinical success. James Ewing, a very famous cancer pathologist for whom the Ewing sarcoma is named, was Coley's boss at Memorial Hospital in New York and terminated Coley's bacterial therapy of cancer. A tumor from a patient with soft-tissue Ewing's sarcoma, who failed doxorubicin (DOX) therapy, was previously implanted in nude mice to establish a patient-derived orthotopic xenograft (PDOX) model. In the present study, the Ewing's sarcoma PDOX was treated with tumor-targeting S...
March 15, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28287814/activation-and-deactivation-of-5-ht1-receptor-of-accumbens-shell-area-does-not-alter-acpa-induced-aversive-memory-deficit-in-male-rat
#17
Marzieh Keramati-Nojedehsadat, Shahrbanoo Oryan, Mohammad Reza Zarrindast, Vahab Babapour
BACKGROUND: Some studies have indicated a close relation between serotonergic and cannabinoidergic systems in several brain regions. Thus, the aim of current study is investigating the effect of 5-HT1 receptors of accumbens shell (Acb shell) on aversive memory deficit induced by ACPA (cannabinoid CB1 receptor agonist) using test-retest protocol of elevated plus-maze (EPM) in male Wistar rats. METHOD: Bilateral guide cannulae were implanted to allow microinjection of ACPA, CP94253 HCL (5-HT1 receptor agonist agonist) or GR127935 HCL (5-HT1 receptor antagonist)...
March 2017: Archives of Iranian Medicine
https://www.readbyqxmd.com/read/28283757/concept-of-patient-specific-shape-memory-implants-for-the-treatment-of-orbital-floor-fractures
#18
Ronny Grunert, Maximilian Wagner, Christian Rotsch, Harald Essig, Susanna Posern, Friedemann Pabst, Welf-Guntram Drossel, Juergen Lichtenstein
PURPOSE: We will aim to develop implants made of a Ni-Ti shape memory alloy which can be applied for the treatment of midface fractures, such as isolated orbital floor fractures. These can then be implanted in a compressed form and unfold automatically in the body. With the help of newly developed application instruments, the implants can be applied along transnasal and transantral approaches into the maxillary sinus. Our objective is to evaluate the operation process and the functionality of these implants, already in a pre-investigation by an experienced surgeon on a phantom...
March 10, 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28277213/the-effect-of-learning-modality-and-auditory-feedback-on-word-memory-cochlear-implanted-versus-normal-hearing-adults
#19
Riki Taitelbaum-Swead, Michal Icht, Yaniv Mama
BACKGROUND: In recent years, the effect of cognitive abilities on the achievements of cochlear implant (CI) users has been evaluated. Some studies have suggested that gaps between CI users and normal-hearing (NH) peers in cognitive tasks are modality specific, and occur only in auditory tasks. PURPOSE: The present study focused on the effect of learning modality (auditory, visual) and auditory feedback on word memory in young adults who were prelingually deafened and received CIs before the age of 5 yr, and their NH peers...
March 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28268901/a-flexible-parylene-probe-for-in-vivo-recordings-from-multiple-subregions-of-the-rat-hippocampus
#20
Huijing Xu, Ahuva Weltman, Min-Chi Hsiao, Kee Scholten, Ellis Meng, Theodore W Berger, Dong Song
The hippocampus is crucial to the formation of long-term memory and declarative memory. It is divided into three sub-fields the CA1, the CA3 and the DG. To understand the neuronal circuitry within the hippocampus and to study the role of the hippocampus in memory function requires the collection of neural activities from multiple subregions of the hippocampus simultaneously. Micro-wire electrode arrays are commonly used as an interface with neural systems. However, recording from multiple deep brain regions with curved anatomical structures such as the thin cell body layers of the hippocampus requires the micro-wires to be arranged into a highly accurate, complex layout that is difficult to fabricated manually...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
keyword
keyword
57003
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"