Article
Biology
Ali Foroutannia, Fahimeh Nazarimehr, Mahdieh Ghasemi, Sajad Jafari
Summary: Studying the dynamical behaviors of neuronal models can lead to a better understanding of the real nervous system and specific phenomena in the neuronal system. The thalamocortical network plays a crucial role in consolidating memory function during sleep through the creation of up and down state oscillations and fast-slow spindles.
JOURNAL OF THEORETICAL BIOLOGY
(2021)
Article
Mathematics, Applied
Divya D. Joshi, Prashant M. Gade, Sachin Bhalekar
Summary: In this study, we investigate the fractional maps of complex order in one and two dimensions and find that smooth maps tend to exhibit regular behavior while discontinuous or non-differentiable maps may show chaos. Additionally, complex fractional-order maps that exhibit chaos in two dimensions also demonstrate multistability.
Article
Multidisciplinary Sciences
Johannes Werner, Tobias Pietsch, Frank M. Hilker, Hartmut Arndt
Summary: This article discusses the importance of oscillations and deterministic chaos in natural biological systems, particularly in single-species systems. Through experimental and modeling studies, the nonlinear dynamics and deterministic chaos characteristics are discovered in single-species systems of protists in continuous experimental chemostat system. The study also demonstrates the significant influence of complex processes occurring in single cells on the dynamic behavior at the population level.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
M. Baity-Jesi, E. Calore, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, I. Gonzalez-Adalid Pemartin, A. Gordillo-Guerrero, D. Iniguez, A. Maiorano, E. Marinari, V. Martin-Mayor, J. Moreno-Gordo, A. Munoz Sudupe, D. Navarro, I. Paga, G. Parisi, S. Perez-Gaviro, F. Ricci-Tersenghi, J. J. Ruiz-Lorenzo, S. F. Schifano, B. Seoane, A. Tarancon, D. Yllanes
Summary: Memory and rejuvenation effects in off-equilibrium spin glasses have been regarded as a gateway to experimental exploration of ultrametricity and temperature chaos. However, simulating these effects has been difficult until recent advancements in computing power and understanding of length scales in aging dynamics of spin glasses. A numerical study has shown that at least three different length scales play a crucial role in aging dynamics, challenging previous theories that focused on a single glassy correlation length.
Article
Physics, Fluids & Plasmas
Johann Maddi, Christophe Coste, Michel Saint Jean
Summary: This study investigates a conservative but nonintegrable dimer system in a periodic potential well and discovers its surprisingly rich dynamics. By employing systematic asymptotic analysis and numerical integration, the amplitude equations for the center of mass motion and relative motion are derived, and reliable estimates of the parameters for autoparametric resonance are provided.
Article
Physics, Multidisciplinary
B. Kaviya, R. Gopal, R. Suresh, V. K. Chandrasekar
Summary: We study the dynamics of a damped and driven Mathews-Lakshmanan oscillator type model with position-dependent mass term and find two distinct bifurcation routes leading to sudden, intermittent large-amplitude chaotic oscillations. These infrequent and recurrent large oscillations are characterized as extreme events (EE) when they exceed a pre-defined threshold height. Our findings reveal the emergence of EE from two different bifurcation routes, which has not been reported before. We discuss that EE are caused by the sudden expansion of the chaotic attractor through interior crisis in the system. The different dynamical states are distinguished using Lyapunov exponent spectrum, and the SNA and QP dynamics are determined using singular spectrum analysis and 0-1 test. The region of EE is characterized using the threshold height.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Materials Science, Multidisciplinary
Frank Schindler, Nicolas Regnault, B. Andrei Bernevig
Summary: In this work, a large family of exact eigenstates for density-density interaction terms is found, showing diverse real-space entanglement entropy scaling behaviors and identified through momentum-space entanglement as quantum many-body scars. These exact states differ from typical eigenstates in their momentum-space entanglement and are enabled by the interplay of Fermi statistics and chirality.
Article
Optics
Maxime Martinez, Pierre-Elie Larre, Dominique Delande, Nicolas Cherroret
Summary: In random kicked rotors with local interactions, the system exhibits a rich dynamical phase diagram when the random kinetic energy is smaller than the interaction energy. This includes a low-energy prethermal phase and sharp crossovers towards full thermalization.
Article
Mathematics, Applied
Debarghya Pattanayak, Arindam Mishra, Nandadulal Bairagi, Syamal K. Dana
Summary: This paper discusses the statistics of transient dynamics in a classic tri-trophic food chain with bistability. It is found that the distribution of the transient time to predator extinction exhibits interesting patterns of inhomogeneity and anisotropy in the basin of the predator-free state. Two new metrics, homogeneity index and local isotropic index, are introduced to characterize the distinctive features of the distribution. The paper also explains the origin of multimodal distributions and presents their ecological implications.
Article
Mathematics, Applied
Gonzalo Marcelo Ramirez-Avila, Juergen Kurths, Jason A. C. Gallas
Summary: Stability rings are closed parameter paths in the control space of a vertical-cavity surface-emitting semiconductor laser where laser stability can be maintained even in the presence of small parameter fluctuations. Research suggests that such stability-enhancing rings are common structures present in the control parameter space of many complex systems.
Article
Physics, Multidisciplinary
Jiahui Li, Rosario Fazio, Stefano Chesi
Summary: This paper studies the semiclassical limit of the anisotropic two-photon Dicke model with a dissipative bosonic field and describes its rich nonlinear dynamics, including fixed points, limit cycles, chaotic dynamics, and phase coexistence.
NEW JOURNAL OF PHYSICS
(2022)
Review
Mathematics, Interdisciplinary Applications
Markus Vogl
Summary: This study applies bibliometric analysis and snowball sampling procedure to examine the relevant publications and contributions in financial chaos research, and presents the interconnectivities and gaps within the existing research. It also discusses a controversy regarding the dynamics of financial dataset and provides empirical insights derived from the sampled literature. Additionally, the study explores the interconnections between chaoticity, Hurst exponents, multifractality, scaling, long memory, and market efficiency.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Engineering, Multidisciplinary
Augusto Cheffer, Marcelo A. Savi, Tiago Leite Pereira, Aline Souza de Paula
Summary: This study investigates cardiac rhythms through a mathematical model analyzing the electrical activity of the heart and conducting numerical simulations to reproduce synthetic ECGs with various responses. The results show that nonlinear tools can assist in understanding physiology and characterizing pathologies.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Pharmacology & Pharmacy
Jingyao Jiang, Yi Zhao, Jin Liu, Yaoxin Yang, Peng Liang, Han Huang, Yongkang Wu, Yi Kang, Tao Zhu, Cheng Zhou
Summary: This study investigates the EEG changes induced by isoflurane anesthesia and explores the underlying neurophysiological mechanisms. The findings demonstrate a correlation between isoflurane concentration and the power of slow and alpha oscillations, as well as the thalamocortical coherence. These EEG changes provide neurophysiological signatures for monitoring the depth of isoflurane anesthesia.
FRONTIERS IN PHARMACOLOGY
(2022)
Article
Engineering, Mechanical
Zhimin Wang, Guoguang Jin, Dong Liang, Zhan Wei, Boyan Chang, Yang Zhou
Summary: In this study, a dynamic modeling and analysis method for a planar six-bar feeding mechanism with multi-clearance lubricated joints is proposed based on the Newton-Euler equation. The influence of clearance size, crank speed, and viscosity coefficient of lubricant on the dynamic behavior of the mechanism is comprehensively revealed under dry friction and lubrication conditions. The bifurcation and chaotic behavior of the mechanism under lubrication condition are emphatically studied, and the combined effect of crank speed and clearance size on the nonlinear behavior of the mechanism is investigated.
NONLINEAR DYNAMICS
(2023)
Article
Clinical Neurology
Jennifer M. Walters, Eung Chang Kim, Jiaren Zhang, Han Gil Jeong, Archit Bajaj, Brian C. Baculis, Gregory C. Tracy, Baher Ibrahim, Catherine A. Christian-Hinman, Daniel A. Llano, Graham R. Huesmann, Hee Jung Chung
Summary: This study is the first to demonstrate that the drug TC-2153 has inhibitory effects on hippocampal excitability and seizure severity in both sexes. TC-2153 can reduce seizure severity and decrease overall hippocampal excitability.
Article
Neurosciences
Daniel A. Llano, Susanna S. Kwok, Viswanath Devanarayan
Summary: The study found a connection between hearing loss and smaller brainstem and cerebellar volumes in Alzheimer's Disease (AD) patients, with a more rapid decrease in brain volumes among normal subjects with hearing loss, suggesting that hearing loss may accelerate AD pathology.
FRONTIERS IN HUMAN NEUROSCIENCE
(2021)
Article
Acoustics
Jihun Kim, Mathew R. Lowerison, Nathiya V. Chandra Sekaran, Zhengchang Kou, Zhijie Dong, Michael L. Oelze, Daniel A. Llano, Pengfei Song
Summary: Ultrasound localization microscopy (ULM) shows potential for visualizing tissue microvasculature at depth with high spatial resolution. A novel ULM imaging sequence based on MB uncoupling via transmit excitation (MUTE) is proposed, which silences MB signals to facilitate MB separation and localization, resulting in reduced data acquisition time and improved temporal resolution.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Neurosciences
Georgiy Yudintsev, Alexander R. Asilador, Stacy Sons, Nathiya Vaithiyalingam Chandra Sekaran, Macey Coppinger, Kavya Nair, Masumi Prasad, Gang Xiao, Baher A. Ibrahim, Yoshitaka Shinagawa, Daniel A. Llano
Summary: Research has shown that there are differences in the origin and termination patterns of layer 5 and layer 6 corticocollicular neurons in the auditory cortex, with layer 5 neurons concentrated in the primary AC and layer 6 neurons originating from broader auditory and limbic areas. Additionally, layer 5 sends dense projections to all regions of nonlemniscal IC, while layer 6 sends smaller terminals to the most superficial part of the IC. This diversity in the corticocollicular pathway suggests distinct roles in top-down modulation, with layer 5 providing strong, rapid, and unimodal feedback, while layer 6 provides heteromodal and limbic modulation diffusely.
JOURNAL OF NEUROSCIENCE
(2021)
Article
Multidisciplinary Sciences
Matthew R. Lowerison, Nathiya Chandra Sekaran, Wei Zhang, Zhijie Dong, Xi Chen, Daniel A. Llano, Pengfei Song
Summary: Aging-related cognitive decline is a health crisis, with no established mechanism identified. This study used super-resolution ultrasound localization microscopy to image the vasculature of aged mice and found decreased blood velocity, increased vascular tortuosity, and reduced blood volume in the cerebral cortex. These findings provide novel insights into subcortical microvascular dynamics in the aging brain.
SCIENTIFIC REPORTS
(2022)
Article
Psychology, Multidisciplinary
Susanna S. Kwok, Xuan-Mai T. Nguyen, Diana D. Wu, Raksha A. Mudar, Daniel A. Llano
Summary: The association between age-related hearing loss (ARHL) and Alzheimer's Disease (AD) is still poorly understood. A meta-analysis study revealed that AD patients have significantly impaired hearing compared to controls, with a greater effect seen at higher sound frequencies.
FRONTIERS IN PSYCHOLOGY
(2022)
Article
Geriatrics & Gerontology
Lydia T. Nguyen, Elizabeth A. Lydon, Shraddha A. Shende, Daniel A. Llano, Raksha A. Mudar
Summary: Individuals with mild cognitive impairment (MCI) show impaired value-directed strategic processing compared to cognitively normal older adults, as evidenced by behavioral and neural differences.
Article
Neurosciences
David Perez-Gonzalez, Thomas G. Schreiner, Daniel A. Llano, Manuel S. Malmierca
Summary: Age-related hearing loss is a common condition among the elderly, impacting their communication and social participation. Recent studies suggest a possible link between hearing loss and the development of Alzheimer's disease, with changes in acetylcholine playing a role in both hearing deviance detection and Alzheimer's disease. Further research is needed to explore this association.
FRONTIERS IN NEUROSCIENCE
(2022)
Article
Psychology, Multidisciplinary
Elizabeth A. L. Stine-Morrow, Giavanna S. McCall, Ilber Manavbasi, Shukhan Ng, Daniel A. Llano, Aron K. K. Barbey
Summary: Considerable evidence suggests that language processing depends on memory processes vulnerable to aging declines. This study found that sustained literacy engagement, such as leisure reading, had positive effects on memory and cognition in older adults. The experimental group showed improved verbal working memory, episodic memory, and conceptual integration in sentence processing, regardless of personality characteristics.
FRONTIERS IN PSYCHOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Qi You, Joshua D. Trzasko, Matthew R. Lowerison, Xi Chen, Zhijie Dong, Nathiya Vaithiyalingam ChandraSekaran, Daniel A. Llano, Shigao Chen, Pengfei Song
Summary: This study introduces a curvelet transform-based sparsity promoting (CTSP) algorithm that improves the imaging speed of ultrasound localization microscopy (ULM) by recovering missing microbubble localization signal from data with very short acquisition times. The results demonstrate that CTSP can facilitate fast and robust ULM imaging, especially when microbubble localizations are inadequate.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Review
Behavioral Sciences
Silvio Macias, Daniel A. Llano
Summary: This study takes a comparative approach to understand the top-down modulation mechanisms in the mammalian and amphibian inferior colliculus (IC). The key question addressed is whether the thalamotectal projections in mammals and amphibians are homologous and how they interact with projections from the cerebral cortex. The behavioral significance of these descending pathways is also considered, particularly in anurans' ability to navigate complex acoustic landscapes without a corticocollicular projection.
JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
(2023)
Article
Neurosciences
Ashwini G. Naik, Robert Kenyon, Aynaz Taheri, Tanya Y. BergerWolf, Baher A. Ibrahim, Yoshitaka Shinagawa, Daniel A. Llano
Summary: Understanding the functional correlations between neuron populations is crucial for studying neuronal networks. V-NeuroStack is a novel network visualization tool that allows visualization of large-scale neuronal activity data. It offers both 3D and 2D visualization modes to explore correlations between neurons and examine specific time steps in detail. It can handle large datasets and potentially support future advancements in data capturing techniques.
JOURNAL OF NEUROSCIENCE RESEARCH
(2023)
Editorial Material
Behavioral Sciences
Peter M. Narins, Daniel A. Llano, Gunther K. H. Zupanc
Summary: This special issue of the Journal of Comparative Physiology A commemorates the life and work of Albert (Al) S. Feng, a pioneer in the field of neuroethology of auditory systems. It includes 15 articles written by friends, students, and colleagues, many of whom have become leading experts themselves in this field. Their contributions provide a comprehensive overview of bioacoustics in amphibians and mammals (including bats) and aim to inspire a new generation of scientists to advance our understanding of brain mechanisms of acoustic perception.
JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
(2023)
Article
Geriatrics & Gerontology
Daniel A. Llano, Priya Devanarayan, Viswanath Devanarayan
Summary: This study proposes a framework for classifying and combining biomarkers for Alzheimer's Disease (AD). The researchers found that low levels of VGF in cerebrospinal fluid (CSF) can serve as a strong predictor for the conversion from mild cognitive impairment (MCI) to AD.
NEUROBIOLOGY OF AGING
(2023)
Article
Medicine, General & Internal
Suzanna Kitten, Neel D. Jani, Daniel A. Llano
Summary: Functional neurological symptom disorder is a condition where neurological deficits cannot be explained by medical pathology, and auditory verbal agnosia is one of its manifestations. This case study demonstrates the effectiveness of a multi-pronged treatment approach in resolving conversion symptoms in a 19-year-old patient over several years.
CUREUS JOURNAL OF MEDICAL SCIENCE
(2022)