Results 61 to 70 of about 8,598 (236)

Theta‐gamma coupling and ApoE genotype in patients at risk for Alzheimer’s dementia [PDF]

Alzheimer's & Dementia, 2020
AbstractBackgroundTheta‐gamma coupling (TGC) is an electroencephalography (EEG) marker of working memory and depends on robust synaptic plasticity within the recurrent prefrontal cortical networks (Rajji et al. 2017, Buszaski et al. 2012). ApoE4 allele has deleterious effects on synaptic plasticity (Teter et al. 2004).
Rachel A Patterson, Heather J Brooks, Reza Zomorrodi, Sanjeev Kumar, Daniel M Blumberger, Ariel Graff‐Guerrero, Corinne E Fischer, Alastair Flint, Nathan Herrmann, James L Kennedy, Krista L Lanctot, Linda Mah, Benoit H Mulsant, Bruce G Pollock, Tarek K Rajji   +14 more
openaire   +1 more source

Time‐Dependent Oxidation and Scale Evolution of a Wrought Co/Ni‐Based Superalloy

Advanced Engineering Materials, EarlyView.
This study shows how a new wrought Co/Ni‐based superalloy resists oxidation at 800 ∘$^\circ$C. The oxide scale changes from rough, fast‐growing spinel to a dense, protective chromia–alumina layer. Atom probe analysis reveals tiny refractory‐rich bubbles at the interface that mark the transition to long‐term, diffusion‐controlled protection ...
Cameron Crabb, Zachary T. Kloenne, Samuel R. Rogers, Chi Hang Dominik Kwok, Mark C. Hardy, Michele S. Conroy, David Dye   +6 more
wiley   +1 more source

Fear and Safety Engage Competing Patterns of Theta-Gamma Coupling in the Basolateral Amygdala [PDF]

Neuron, 2014
Theta oscillations synchronize the basolateral amygdala (BLA) with the hippocampus (HPC) and medial prefrontal cortex (mPFC) during fear expression. The role of gamma-frequency oscillations in the BLA is less well characterized. We examined gamma- and theta-frequency activity in recordings of neural activity from the BLA-HPC-mPFC circuit during fear ...
Stujenske, Joseph M., Likhtik, Ekaterina, Topiwala, Mihir A., Gordon, Joshua A.   +3 more
openaire   +2 more sources

Theta-gamma phase-amplitude coupling in psychosis and healthy controls: Predicting working memory capacity across different tasks

NeuroImage: Clinical
Theta-gamma phase-amplitude coupling has been proposed as a possible mechanism underlying working memory. Here, we assess whether cortical theta-gamma phase-amplitude coupling is related to working memory deficits in patients with psychosis, and whether ...
Orestis Papaioannou, Kailey Clark, Nicole N Ogbuagu, Steven M Silverstein, Judy L Thompson, Molly A Erickson   +5 more
doaj   +1 more source

Microstructure Reconstruction in Battery Electrodes Using Machine Learning Based on Low‐Voltage Focused Ion Beam–Scanning Electron Microscopy Tomography Images

Advanced Engineering Materials, EarlyView.
Low‐voltage FIB‐SEM tomography combined with a image preprocessing pipeline improves phase contrast and enables reliable machine‐learning segmentation of conductive networks in lithium‐ion battery electrodes. Structural descriptors are extracted from segmented images, done semimanually and automated, and compared.
Lisa Beran, Vincent Nebel, Dominik Perius, Kshitij Kumar, Yannis Heim, Laura Bies, Tobias Kraus   +6 more
wiley   +1 more source

Modeling Dislocation Cutting of γ′ Precipitates in Ni‐Base Superalloys: Linking Atomistic and Dislocation Dynamics Simulations

Advanced Engineering Materials, EarlyView.
Dislocation cutting of γ′ precipitates in Ni‐based superalloys is investigated by linking atomistic simulations with discrete dislocation dynamics. The critical cutting stress is shown to be governed by the antiphase boundary energy, while line tension effects promote edge‐preferred cutting.
Frédéric Houllé, Siwen Gao, Marc Fivel, Anxin Ma, Daria Smirnova, Sriram Anand, Arun Prakash, Julien Guénolé, Alexander Hartmaier, Erik Bitzek   +9 more
wiley   +1 more source

Increasing motor skill acquisition by driving theta-gamma coupling [PDF]

, 2019
Abstract Skill learning is a fundamental adaptive process, but the mechanisms remain poorly understood. Hippocampal learning is closely associated with gamma activity, which is amplitude-modulated by the phase of underlying theta activity.
Akkad, Haya, Dupont-Hadwen, Joshua, Frese, Amba, Tetkovic, Irena, Barrett, Liam, Bestmann, Sven, Stagg, Charlotte J   +6 more
openaire   +1 more source

Spatial Reference Memory is Associated with Modulation of Theta–Gamma Coupling in the Dentate Gyrus [PDF]

Cerebral Cortex, 2015
Spatial reference memory in rodents represents a unique opportunity to study brain mechanisms responsible for encoding, storage and retrieval of a memory. Even though its reliance on hippocampal networks has long been established, the precise computations performed by different hippocampal subfields during spatial learning are still not clear. To study
Bott, Jean-Bastien, Muller, Marc-Antoine, Jackson, Jesse, Aubert, Julien, Cassel, Jean-Christophe, Mathis, Chantal, Goutagny, Romain   +6 more
openaire   +3 more sources

Influence of Scan Strategies in Electron Beam Powder Bed Fusion on Solidification, Microstructure, and High‐Temperature Compressive Properties of γ′‐Strengthened Inconel 738LC

Advanced Engineering Materials, EarlyView.
Experiments and thermophysical simulations were conducted to investigate the electron beam powder bed fusion electron beam (PBF‐EB/M) process for the γ′‐strengthened nickel‐based superalloy Inconel 738LC. The results demonstrate the impact of process‐induced microstructural variations on high‐temperature mechanical behavior, providing a basis for ...
Jan Niklas Petenati, Karthik Kumar Banku, Prasanth Bondi, Ivan Zhirnov, Yangyiwei Yang, Gordon Schmidt, Jürgen Christen, Georg Hasemann, Manja Krüger, Bai‐Xiang Xu, Bilal Gökce, Silja‐Katharina Rittinghaus   +11 more
wiley   +1 more source

Multiple cross-frequency coupling analysis of resting-state EEG in patients with mild cognitive impairment and Alzheimer’s disease

Frontiers in Aging Neuroscience, 2023
IntroductionElectroencephalographic (EEG) abnormalities are seen in patients with Alzheimer’s disease (AD) and mild cognitive impairment (MCI) with characteristic features of cognitive impairment.
Xi Chen, Yingjie Li, Yingjie Li, Renren Li, Xiao Yuan, Meng Liu, Meng Liu, Wei Zhang, Yunxia Li, Yunxia Li   +9 more
doaj   +1 more source