21 papers · ranked by Valyu relevance
Jafar Doostmohammadi, Marc Alwin Gieselmann, Jochem van Kempen, Reza Lashgari + 2 more
Sharp-wave ripples (SWRs) are highly synchronous neuronal activity events. They have been predominantly observed in the hippocampus during offline states such as pause in exploration, slow-wave sleep and quiescent wakefulness. SWRs have been linked to memory consolidation, spatial navigation, and spatial…
José R Donoso, Nikolay Chenkov, Richard Kempter
Sharp wave-ripples (SWRs) are highly synchronous network events displayed by the mammalian hippocampus during slow-wave sleep and immobile resting periods. A SWR event (~100 ms duration) is characterized by fast network oscillations (~200 Hz "ripples") superimposed by a sharp wave, which is a large-amplitude…
Adrian Aleman-Zapata, Melisa Maidana Capitan, Anumita Samanta, Pelin Özsezer + 4 more
'Pelin Özsezer' 'Kopal Agarwal' 'Tugdual Adam' 'Abdelrahman Rayan' 'Lisa Genzel'] Title: Summary Hippocampal ripples project reactivated memories to many brain areas, and recently it has been proposed that different types of ripples exist whose information content is influenced by different regions. Utilizing a…
ZHENG Zishuo
The hippocampus is key to memory encoding, consolidation, and retrieval. Previous work shows that neurons in the hippocampus fire in sequence to encode spatial information. The same group of cells will replay in memory consolidation, coupled with ripples, spindle, and slow waves. As for episodic memory, engram cells…
Anna Maslarova, Jiyun N Shin, Andrea Navas-Olive, Mihály Vöröslakos + 5 more
Hippocampal sharp-wave ripples (SPW-Rs) are high-frequency oscillations critical for memory consolidation in mammals. Despite extensive characterization in rodents, their application as biomarkers to track and treat memory dysfunction in humans is limited by coarse spatial sampling, interference from interictal…
Wilhelm Braun, Raoul-Martin Memmesheimer
Hippocampal sharp wave/ripple oscillations are a prominent pattern of collective activity, which consists of a strong overall increase of activity with onmodulated (140 – 200 Hz) ripple oscillations. Despite its prominence and its experimentally demonstrated importance for memory consolidation, the mechanisms…
Nikolaus Maier, Genela Morris, Friedrich W. Johenning, Dietmar Schmitz + 1 more
'Dietmar Schmitz' 'Liset Menendez de la Prida'] Background Among the various hippocampal network patterns, sharp wave-ripples (SPW-R) are currently the mechanistically least understood. Although accurate information on synaptic interactions between the participating neurons is essential for comprehensive understanding…
ZhiYong Sun, P. Lorenzo Bozzelli, Adam Caccavano, Megan Allen + 4 more
Hippocampal sharp wave ripples (SWRs) represent irregularly occurring synchronous neuronal population events that are observed during phases of rest and slow wave sleep. SWR activity that follows learning involves sequential replay of training-associated neuronal assemblies and is critical for systems level memory…
Bruno Monteiro de Sousa, Eliezyer Fermino de Oliveira, Ikaro Jesus da Silva Beraldo, Rafaela Schuttenberg Polanczyk + 2 more
Sharp wave-ripples (SWRs, 100-250 Hz) are oscillatory events extracellularly recorded in the CA1 subfield of the hippocampus during sleep and quiet wakefulness. SWRs are thought to be involved in the dialogue between the hippocampus and cortical regions to promote memory consolidation during sleep and memory-guided…
Robson Scheffer-Teixeira, Adriano Tort
Sharp-wave ripples (SWRs) are hippocampal network oscillations associated with memory consolidation. They are characterized by the co-occurrence of fast and slow field potentials across CA1 layers: the fast-frequency oscillations, known as ripples, are prominent in the pyramidal cell layer, where they coincide with…
Alexei A. Mailybaev, André Nachbin
Considering two-dimensional potential ideal flow with free surface and finite depth, we study the dynamics of small-amplitude and short-wavelength wavetrains propagating on the background of a steepening nonlinear wave. This can be seen as a model for small ripples developing on slopes of breaking waves in the surf…
Jonathan Colen, Eugene B. Kolomeisky
According to Kelvin, a point pressure source uniformly traveling over the surface of deep calm water leaves behind universal wake pattern confined within 39◦ sector and consisting of the socalled transverse and diverging wavefronts. Actual ship wakes differ in their appearance from both each other and Kelvin's…
Primož Kajdič, Yann Pfau‐Kempf, Lucile Turc, A. P. Dimmock + 1 more
'Minna Palmroth'] We study the interaction of upstream ultra-low frequency (ULF) waves with collisionless shocks by analyzing the outputs of eleven 2D local hybrid simulation runs. Our simulated shocks have Alfv´enic Mach numbers between 4.29-7.42 and their θBN angles are 15◦ , 30◦ , 45◦ and 50◦ . The ULF wave…
A. Mansar, M. R. Turner, T. J. Bridges, F. Dias
The mechanism for the emergence of breaking water waves in deep water, based on the superharmonic instability of periodic Stokes waves, is tested for the effect of real-world perturbations (dissipation, approximation error, changes in depth, non-zero air density, fluctuations in wave and frame speed). An implicit…
Olga Trichtchenko, Bernard Deconinck, Jon Wilkening
Wilton ripples are a type of periodic traveling wave solution of the full water wave problem incorporating the effects of surface tension. They are characterized by a resonance phenomenon that alters the order at which the resonant harmonic mode enters in a perturbation expansion. We compute such solutions using…
Maziyar Jalaal, Carola Seyfert, Jacco H. Snoeijer
Capillary ripples on thin viscous films are important features of coating and lubrication flows. Here we present experiments based on Digital Holographic Microscopy, measuring the morphology of capillary ripples ahead of a viscous drop spreading on a prewetted surface with a nanoscale resolution. Our experiments reveal…
Taiga Kanehira, James Steer, Laura-Beth Jordan, Shaun Fraser + 3 more
The deterministic reproduction of complex 3D wave fields remains a significant challenge in ocean engineering. This study proposes a novel methodology for drawing arbitrary 2D curves and 3D volumetric shapes on a water surface using transient multi-directional focused waves. To overcome the limitations of conventional…
Abhinav Priyadarshi, Paul Prentice, Dmitry Eskin, Peter D. Lee + 1 more
'Iakovos Tzanakis'] Title: Graphical abstract
Iskander Abroug, Nizar Abcha, Denys Dutykh, Armelle Jarno + 1 more
'François Marin'] The propagation of focused wave groups in intermediate water depth and the shoaling zone is experimentally and numerically considered in this paper. The experiments are carried out in a two-dimensional wave flume and wave trains derived from Pierson-Moskowitz and JONSWAP spectrum are generated. The…
Ashley Fidler, Yen-Cheng Lin, James Gaynor, William McCurdy + 3 more
Nonlinear spectroscopies can disentangle spectra that are congested due to inhomogeneous broadening. In conjunction with theoretical calculations, attosecond extreme ultraviolet (XUV) four-wave mixing (FWM) spectroscopy is utilized here to probe the dynamics of autoionizing, inner valence excited Rydberg states of the…
Yan Li, Amin Chabchoub
Wave transformation is an intrinsic dynamic process in coastal areas. An essential part of this process is the variation of water depth, which plays a dominant role in the propagation features of water waves, including a change in wave amplitude during shoaling and de-shoaling, breaking, celerity variation, refraction…