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638 results for “Oscillation”
Spontaneous pupillary oscillations increase during mindfulness meditation
<p>This is the dataset reported in the manuscript "Spontaneous pupillary oscillations increase during mindfulness meditation" currently under review</p>
Data from: Rapid adaptation in large populations with very rare sex: scalings and spontaneous oscillations
Genetic exchange in microbes and other facultative sexuals can be rare enough that evolution is almost entirely asexual and populations almost clonal. But the benefits of genetic exchange depend crucially on the diversity of genotypes in a population. How very rare recombination together with the accumulation of new mutations shapes the diversity of large populations and gives rise to faster adaptation is still poorly understood. This paper analyzes a particularly simple model: organisms with two asexual chromosomes that can reassort during rare matings that occur at a rate r. The speed of adaptation for large population sizes, N, is found to depend on the ratio ∼ log(Nr)/log(N). For larger populations, the r needed to yield the same speed deceases as a power of N. Remarkably, the population undergoes spontaneous oscillations alternating between phases when the fittest individuals are created by mutation and when they are created by reassortment, which—in contrast to conventional regimes—decreases the diversity. Between the two phases, the mean fitness jumps rapidly. The oscillatory dynamics and the strong fluctuations this induces have implications for the diversity and coalescent statistics. The results are potentially applicable to large microbial populations, especially viruses that have a small number of chromosomes. Some of the key features may be more broadly applicable for large populations with other types of rare genetic exchange.
Data from: Walking crowds on a shaky surface: stable walkers discover Millennium Bridge oscillations with and without pedestrian synchrony
Why did the London Millennium Bridge shake when there was a big enough crowd walking on it? What features of human walking dynamics when coupled to a shaky surface produce such shaking? Here, we use a simple biped model capable of walking stably in 3D to examine these questions. We simulate multiple such stable bipeds walking simultaneously on a bridge, showing that they naturally synchronize under certain conditions, but that synchronization is not required to shake the bridge. Under such shaking conditions, the simulated walkers increase their step-widths and expend more metabolic energy than when the bridge does not shake. We also find that such bipeds can walk stably on externally shaken treadmills, synchronizing with the treadmill motion for a range of oscillation amplitudes and frequencies, sometimes performing net positive work on the treadmill. Our simulations illustrate how interactions between (idealized) bipeds through the walking surface can produce emergent collective behavior that may not be exhibited by just a single biped.
Global diversification of Anelosimus spiders driven by long distance overwater dispersal and Neogene climate oscillations
Vicariance and dispersal events, combined with intricate global climatic history, have left an imprint on the spatiotemporal distribution and diversity of many organisms. Anelosimus cobweb spiders (Theridiidae), are solitary-social organisms with a cosmopolitan distribution in temperate- to-tropical areas. Their evolutionary history and the discontinuous distribution of species richness suggest that 1) long distance overwater dispersal, and 2) climate change during the Neogene (23–2.6 Ma), may be major factors in explaining their distribution and diversification. Here we test these hypotheses, and explicitly test if global Miocene/Pliocene climatic cooling in the last 8 Ma affected Anelosimus radiation in parallel in South America and Madagascar. To do so, we investigate the phylogeny and spatiotemporal biogeography of Anelosimus through a culmination of a 20-year comprehensive global sampling at the species level (69 species, including 84% of the known 75 species worldwide, represented by 268 individuals) using nucleotide data from seven loci (5.5 kb). Our results strongly support the monophyly of Anelosimus with an Oligocene (~30 Ma) South American origin. Major clades on other continents originate via multiple, long-distance dispersal events, of solitary or subsocial—but not social—lineages, from the Americas. These intercontinental dispersals were to Africa, Madagascar (twice), and SE Asia/Australasia. The early diversification of Anelosimus spiders coincides with a sudden thermal increase in the late Oligocene (~27–25 Ma), though no causal connection can be made. Our results, however, strongly support the hypothesis that global Neogene climatic cooling in the last 8 Ma drove Anelosimus radiation in parallel in S. America and Madagascar, offering a rare empirical evidence for diversification of a socially diverse group driven by an interplay between long distance dispersal and global Neogene climatic changes.
Data from: Glutamatergic drive along the septo-temporal axis of hippocampus boosts prelimbic oscillations in the neonatal mouse
The long-range coupling within prefrontal-hippocampal networks that account for cognitive performance emerges early in life. The discontinuous hippocampal theta bursts have been proposed to drive the generation of neonatal prefrontal oscillations, yet the cellular substrate of these early interactions is still unresolved. Here, we selectively target optogenetic manipulation of glutamatergic projection neurons in the CA1 area of either dorsal or intermediate/ventral hippocampus at neonatal age to elucidate their contribution to the emergence of prefrontal oscillatory entrainment. We show that despite stronger theta and ripples power in dorsal hippocampus, the prefrontal cortex is mainly coupled with intermediate/ventral hippocampus by phase-locking of neuronal firing via dense direct axonal projections. Theta band-confined activation by light of pyramidal neurons in intermediate/ventral but not dorsal CA1 that were transfected by in utero electroporation with high-efficiency channelrhodopsin boosts prefrontal oscillations. Our data causally elucidates the cellular origin of the long-range coupling in the developing brain.
Data from: Breaking out of the comfort zone: El Niño-Southern Oscillation as a driver of trophic flows in a benthic consumer of the Humboldt Current ecosystem
The trophic flow of a species is considered a characteristic trait reflecting its trophic position and function in the ecosystem and its interaction with the environment. However, climate patterns are changing and we ignore how patterns of trophic flow are being affected. In the Humboldt Current ecosystem, arguably one of the most productive marine systems, El Niño-Southern Oscillation is the main source of interannual and longer-term variability. To assess the effect of this variability on trophic flow we built a 16-year series of mass-specific somatic production rate (P/B) of the Peruvian scallop (Argopecten purpuratus), a species belonging to a former tropical fauna that thrived in this cold ecosystem. A strong increase of the P/B ratio of this species was observed during nutrient-poor, warmer water conditions typical of El Niño, owing to the massive recruitment of fast-growing juvenile scallops. Trophic ecology theory predicts that when primary production is nutrient limited, the trophic flow of organisms occupying low trophic levels should be constrained (bottom-up control). For former tropical fauna thriving in cold, productive upwelling coastal zones, a short time of low food conditions but warm waters during El Niño could be sufficient to waken their ancestral biological features and display massive proliferations.
Reconstructing the Pacific Decadal Oscillation over the last 1600 years by fusing global terrestrial and marine records
<p>This repository includes the PDO reconstruction results of the paper "Reconstructing the Pacific Decadal Oscillation over the last 1600years by fusing global terrestrial and marine records".</p>
Disrupting abnormal neuronal oscillations with adaptive delayed feedback control
<p>This dataset contains the spike data of the experiments performed for the paper:</p><p><strong>Domingos Leite de Castro, Miguel Aroso, A. Pedro Aguiar, David B. Grayden, Paulo Aguiar, "Disrupting abnormal neuronal oscillations with adaptive delayed feedback control", </strong>currently under review</p><p>You can access the pre-print at: https://doi.org/10.1101/2022.07.05.498735</p><p>The data was recorded with the 2100MEA-System from Multichannel Systems using their software Multichannel Experimenter. Each h5 file contains the spike detection results for all electrodes, the electrode labels, and stimulation times. The experiments were performed with microelectrode arrays that contained multiple independent culture wells. The h5 files contain data recorded from all the wells, even though the experiments are only performed in one well at a time. To access the data of a given experiment, choose the electrodes associated with the well identified in the name of the folder, or consult the table in DataTable.xlsx.</p><p>The experiments followed both the European legislation regarding the use of animals for scientific purposes and the protocols approved by the ethical committee of i3S. The Animal Facility of i3S follows the FELASA guidelines and recommendations concerning laboratory animal welfare, complies with the European Guidelines (Directive 2010/63/EU) transposed to Portuguese legislation by Decreto-Lei no 113/2013 and is licensed by the Portuguese official veterinary department (DGAV, Ref 004461). Embryonic (E18) rat hippocampal neurons were cultured on 6-well or 9-well chamber MEA (256-6well MEA200/30iR-ITO-rcr and 256-9wellMEA300/30iR-ITO, respectively) (Multichannel System MCS, Germany) with a density of 5 × 104 cells/well and 3 x 104 cells/well, respectively. Each well of the 6-well MEA has 42 TiN electrodes (array of 7 × 6), and the 9-well contain arrays of 26 TiN electrodes (6 x 5 without corners). The experiments were performed between 13 and 55 days in vitro. </p>
Supporting Data for "Coupling trapped ions to a nanomechanical oscillator"
Open the record for dataset details and reuse information.
Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice
<p>Dataset and codes of the publication "Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice" by Usman Ali, Martin Holthaus, and Torsten Meier,<br>published in PHYSICAL REVIEW RESEARCH 5, 043152 (2023)<br>( <a href="https://doi.org/10.1103/PhysRevResearch.5.043152">https://doi.org/10.1103/PhysRevResearch.5.043152</a> )</p>
Alpha-band oscillations and visual temporal resolution: An expansion and partial replication of Samaha & Postle's 2015 study: "The Speed of Alpha-Band Oscillations Predicts the Temporal Resolution of Visual Perception"
<p>Data for the study "Alpha-band oscillations and visual temporal resolution: An expansion and partial replication of Samaha & Postle’s 2015 study: “The Speed of Alpha-Band Oscillations Predicts the Temporal Resolution of Visual Perception”"</p> <p>Contents consist of curated EEG data for statistical analysis, statistical analysis workflow and code and Matlab code for the behavioural flash fusion task.</p>
A CMOS-compatible oscillation-based VO2 Ising machine solver: Waveforms and code
Open the record for dataset details and reuse information.
Data for the manuscript "Squeezed light from an oscillator measured at the rate of oscillation"
<p>The data and the data analysis scripts supporting the results reported in the manuscript "Squeezed light from an oscillator measured at the rate of oscillation" by Christian Bærentsen, Sergey A. Fedorov, Christoffer Østfeldt, Mikhail V. Balabas, Emil Zeuthen and Eugene S. Polzik.</p> <p>https://arxiv.org/abs/2302.13633</p>
SQUID oscillations in PbTe nanowire networks
<p>This repository contains the raw data and processing codes within the paper "SQUID oscillations in PbTe nanowire networks".</p>
Inlist files for "Detectability of axisymmetric magnetic fields from the core to the surface of oscillating post-main sequence stars"
<p>Concerned article: "Detectability of axisymmetric magnetic fields from the core to the surface of oscillating post-main sequence stars" by Bhattacharya et al. (submitted).<br>Corresponding author: Shatanik Bhattacharya</p> <p>Inlists for the proof-of-concept stellar models used in this project have been provided here for reproducibility.</p> <p>For the red-giant model, the inlist was executed with MESA version r22.05.1 and MESA-SDK version x86 64-linux-22.6.1. Model 500 (age 4.056 Gyr) was used as the RG in this project.</p> <p>For the sub-giant models, the inlist was executed with MESA version r23.05.1 and MESA-SDK version x86 64-linux-22.6.1. Models 345 (age 3.624 Gyr) and 350 (age 3.702 Gyr) were used as the MSG and LSG models respectively.</p>
Data for "FC2DES: Modeling 2D electronic spectroscopy for the Generalized Brownian Oscillator Molecular Hamiltonian"
<p>Within is the 2DES presented in the manuscript: "FC2DES: Modeling 2D electronic spectroscopy for the Generalized Brownian Oscillator Molecular Hamiltonian" as well as the parameter and input files used to create the spectra via the Python code package MolSpecPy.</p>
Self-oscillations of the tube-like astrosphere: new type of instability
<p>Video files complement the main paper, which discusses the instability of astrospheric jets around stars with strong intrinsic magnetic fields.</p> <p><br>"Video-1.avi" corresponds to the 2D flow shown in Figure 2 (Panel A), where the interstellar medium is at rest, $M_A$ = 8, $\chi$ = 4.</p> <p><br>"Video-2.avi" corresponds to the 3D flow shown in Figure 4, with the interstellar medium also at rest and $M_A$ = 3, $\chi$ = 4.</p>
Data for "Improved simulation of Madden–Julian Oscillation with the modified moist physical parameterizations for a global climate model"
<p>Model output data for the manuscript "Improved simulation of Madden–Julian Oscillation with the modified moist physical parameterizations for a global climate model", including convective precipitation (PRECC), large-scale precipitation (PRECL), mean SST and U850, <span>column-integrated MSE tendency anomalies, and boundary layer moisture convergence. </span></p>
Figure files for Charge-noise spectroscopy of Si/SiGe quantum dots via dynamically-decoupled exchange oscillations
<p>This repository contains .fig (matlab) files corresponding to the figures in Charge-noise spectroscopy of Si/SiGe quantum dots via dynamically-decoupled exchange oscillations. The raw data are available from the corresponding author upon reasonable request.</p>
Data for figures: Microresonator Dissipative Kerr Solitons Synchronized to an Optoelectronic Oscillator
<p>This dataset contains the figures and data presented in the paper <Microresonator Dissipative Kerr Solitons Synchronized to an Optoelectronic Oscillator>.</p>
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.