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765 results for “rhythm”
Enhancement of Hippocampal Spatial Decoding with a Q-Learning Method Utilizing Theta Rhythm Phase Precession as the Relative Reward Approach
<p> Winners of the 2014 Nobel Prize in Physiology or Medicine, Professors John O’Keefe, May‐Britt Moser and Edvard I. Moser found that the internal global positioning system (GPS) in the brain allows us to be able to flexibly navigate the world they live in – exploring new areas, returning quickly to remembered places, and taking shortcuts and confirmed that place cells in hippocampus and grid cells in entorhinal cortex (EC) are responsible for higher-order cognitive map of the environment. Indeed, these abilities feel so easy and natural that it is not immediately obvious how complex the underlying processes really are. In contrast, spatial navigation remains a substantial challenge for artificial agents whose abilities are far outstripped by those of mammals. </p> <p> Hippocampal place cells and interneurons in mammals have proved that they own stable place fields and theta phase precession profiles to encode the spatial information from the environment. The hippocampal CA1 neurons can be represented as the location of the animal and the prospective information of goal location. Reinforcement learning algorithm, e.g., Q-learning, has been adopted to build a navigation model of place cells for the purpose of addressing goal direction navigation problems.<br> In this study, we propose dynamical Q-learning (dQ-learning), because of its adaptive reward function based on theta phase precession, which has recently been associated with a rat’s experiences at destinations, and use of information from both place cells and interneurons as inputs to predict the animal’s trajectory. We evaluated the convergence rates and learning performances of tQ-learning and dQ-learning with different cell types. The results demonstrate that dQ-learning improves learning performance and convergence rate and place cells and interneurons with phase precession may provide valuable information to improve the prediction of trajectory. To investigate whether the enhancement of hippocampal spatial decoding with the dQ-learning method was effective in goal-direction navigation, experimental data were recorded from rats implanted with microelectrodes and trained in a water reward task. During the task electrophysiological recordings of spikes, LFPs, and movement trajectories were acquired. The proposed dQ-learning algorithm achieved better learning performance with good prediction accuracy and a high convergence rate. The adaptive reward function and cell types were found to be critical factors for hippocampal spatial decoding using the dQ-learning method. </p>
Sleep–wake-driven and circadian contributions to daily rhythms in gene expression and chromatin accessibility in the murine cortex
<p>Dataset associated with Hor et al PNAS 2019 (<a href="https://www.pnas.org/content/116/51/25773">https://www.pnas.org/content/116/51/25773</a>) and code (<a href="https://github.com/jakeyeung/SleepDepAnalysis">https://github.com/jakeyeung/SleepDepAnalysis</a>).</p> <p>It specifically includes "dat_combat_countsfilt.5.5.Robj" which is a 102 MB file which exceeds limits on github.</p> <p> </p> <p> </p>
Data from: Distractor effect of auditory rhythms on self-paced tapping in chimpanzees and humans
Humans tend to spontaneously align their movements in response to visual (e.g., swinging pendulum) and auditory rhythms (e.g., hearing music while walking). Particularly in the case of the response to auditory rhythms, neuroscientific research has indicated that motor resources are also recruited while perceiving an auditory rhythm (or regular pulse), suggesting a tight link between the auditory and motor systems in the human brain. However, the evolutionary origin of spontaneous responses to auditory rhythms is unclear. Here, we report that chimpanzees and humans show a similar distractor effect in perceiving isochronous rhythms during rhythmic movement. We used isochronous auditory rhythms as distractor stimuli during self-paced alternate tapping of two keys of an electronic keyboard by humans and chimpanzees. When the tempo was similar to their spontaneous motor tempo, tapping onset was influenced by intermittent entrainment to auditory rhythms. Although this effect itself is not an advanced rhythmic ability such as dancing or singing, our results suggest that, to some extent, the biological foundation for spontaneous responses to auditory rhythms was already deeply rooted in the common ancestor of chimpanzees and humans, 6 million years ago. This also suggests the possibility of a common attentional mechanism, as proposed by the dynamic attending theory, underlying the effect of perceiving external rhythms on motor movement.
Data from: Experimental and statistical reevaluation provides no evidence for Drosophila courtship song rhythms
From 1980 to 1992, a series of influential papers reported on the discovery, genetics, and evolution of a periodic cycling of the interval between Drosophila male courtship song pulses. The molecular mechanisms underlying this periodicity were never described. To reinitiate investigation of this phenomenon, we previously performed automated segmentation of songs but failed to detect the proposed rhythm [Arthur BJ, et al. (2013) BMC Biol 11:11; Stern DL (2014) BMC Biol 12:38]. Kyriacou et al. [Kyriacou CP, et al. (2017) Proc Natl Acad Sci USA 114:1970–1975] report that we failed to detect song rhythms because (i) our flies did not sing enough and (ii) our segmenter did not identify many of the song pulses. Kyriacou et al. manually annotated a subset of our recordings and reported that two strains displayed rhythms with genotype-specific periodicity, in agreement with their original reports. We cannot replicate this finding and show that the manually annotated data, the original automatically segmented data, and a new dataset provide no evidence for either the existence of song rhythms or song periodicity differences between genotypes. Furthermore, we have reexamined our methods and analysis and find that our automated segmentation method was not biased to prevent detection of putative song periodicity. We conclude that there is no evidence for the existence of Drosophila courtship song rhythms.
Sex-dimorphic and age-dependent organization of 24 hour gene expression rhythms in human
<p>Supplementary data</p>
Rhythm statue
Rhythm statue autor: Jiří Sobotka material: limestone revealed: 1986 location: Stamicova, Kohoutovice housing estate, Brno Source: Objaverse 1.0 / Sketchfab
Do Sleep and Circadian Rhythm Disturbances Impact the Cognitive and Behavioural Development of Children With Autism?
ClinicalTrials.gov study NCT02878499. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Validation of Digital Heart Rhythm Devices in the Detection of Atrial Fibrillation
ClinicalTrials.gov study NCT06023290. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Towards Understanding Between ADT Treatment, Circadian Rhythm, and Physiological Responsiveness
ClinicalTrials.gov study NCT05968144. IPD Sharing: NO. Countries: 1. Publications: 0.
Stabilization of Circadian Rhythms in Delirious ICU Patients Through Light Intervention
ClinicalTrials.gov study NCT05807178. IPD Sharing: NO. Countries: 1. Publications: 0.
A Light Exposure Tracker Designed to Improve Circadian Rhythms - Aim 1
ClinicalTrials.gov study NCT06356337. IPD Sharing: NO. Countries: 1. Publications: 0.
Biological Rhythms and Vestibular System
ClinicalTrials.gov study NCT01839409. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Changes in Circadian Rhythm After Anaesthesia in Children
ClinicalTrials.gov study NCT05618405. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Resync-AF (Rate vs Rhythm Control in AF Patients With CRT-D)
ClinicalTrials.gov study NCT01233648. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Audiovisuell Distraction Via 2d Videoglasses During Catheter Ablation Procedures in Cardiac Rhythm Disorders.
ClinicalTrials.gov study NCT04873076. IPD Sharing: NO. Countries: 1. Publications: 0.
Prophylactic Anti-aRrhythmic Therapy With Amiodarone in Critically Ill Patients Admitted for an Out-of-hospital Cardiac Arrest With Initial Shockable Rhythm
ClinicalTrials.gov study NCT06835491. IPD Sharing: NO. Countries: 1. Publications: 0.
Brain Computer Interfaces (Mu Rhythm Learning)
ClinicalTrials.gov study NCT02011399. IPD Sharing: Not stated. Countries: 1. Publications: 0.
The Effect of Sequential Feeding for Circadian Rhythm and Gut Flora Rhythm in Critically Ill Patients
ClinicalTrials.gov study NCT06083831. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
The Effect of Simulated Obstructive Apnoea and Hypopnoea on Heart Rhythm in Patients With Paroxysmal Atrial Fibrillation
ClinicalTrials.gov study NCT01796080. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Testing the Performance of Smartphones and Their Accessories in Detecting Irregularly Irregular Heart Rhythm
ClinicalTrials.gov study NCT07154303. IPD Sharing: NO. Countries: 1. Publications: 0.
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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)
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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.