Article
Physics, Multidisciplinary
Bo Zhang, Alexey Snezhko
Summary: This study reports the evidence of hyperuniformity in a chiral active fluid comprised of pear-shaped Quincke rollers and provides new insights into the interplay between chirality, activity, and hyperuniformity.
PHYSICAL REVIEW LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Venkat Venkatasubramanian, Abhishek Sivaram, Laya Das
Summary: Recent attempts towards a theory of active matter have utilized concepts and methods from hydrodynamics, kinetic theory, and non-equilibrium statistical physics. However, these approaches often fail to recognize the crucial feature of active matter, which is the role of purpose and the pursuit of maximum utility. This study introduces a novel game-theoretic framework called statistical teleodynamics, which explicitly accounts for this feature and integrates it with conventional statistical mechanics to create a unified theory of arbitrage equilibrium in both active and passive matter.
COMPUTERS & CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Jing Wang, Lin Ren, Rui Teng, Irving R. Epstein, Hui Wang, Meng Zhang, Ling Yuan, Qingyu Gao
Summary: Chemical waves generated from coupled reactions and transport can mimic nerve signals for studying the origin and regulation of active locomotion. In a nanogel-based PAAm self-oscillating gel, spiral and pulse waves may propagate in directions deviating from the normal to the wave fronts, leading to curved paths and rotational locomotion. This mechanism reveals the general principle behind biological helical locomotion and offers insights for designing complex locomotion in soft robots and smart materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Multidisciplinary
Koushik Goswami
Summary: By modeling the active noise as a generalized form of Ornstein-Uhlenbeck process, the dynamics and work distribution of a Brownian particle in a Gaussian active bath are theoretically investigated, revealing an asymptotic approach to a superdiffusive regime. Two protocols for performing work on the system are considered, with exact expressions for the probability distribution function of work obtained, showing anomalous scaling with time. Fluctuation relations of work are studied, revealing a non-conventional FR emerging in the long-time limit, and recovering known results for the usual OUP bath.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Chemistry, Physical
Pasquale Digregorio, Demian Levis, Leticia F. Cugliandolo, Giuseppe Gonnella, Ignacio Pagonabarraga
Summary: The study provides a comprehensive quantitative analysis of topological defects in 2D passive and active repulsive Brownian disk systems. It reveals that the transition from solid to hexatic phase is driven by the unbinding of dislocations, while extended clusters of defects dominate below the solid-hexatic critical line. Moreover, in high activity regimes, dense phases generated by Motility-Induced Phase Separation exhibit rich topological defect structures.
Article
Physics, Multidisciplinary
Colin-Marius Koch, Michael Wilczek
Summary: The study of a two-dimensional continuum theory for active nematic turbulence reveals that inertial effects can influence flow and lead to large-scale fluid motion when turbulence occurs. Inertial advection mediates energy transfer to large scales.
PHYSICAL REVIEW LETTERS
(2021)
Article
Orthopedics
David A. Nicholls
Summary: The physical therapy profession is at a turning point, with the debate between active and passive therapies reflecting shifting cultural attitudes. The shift towards more self-management has implications for both therapists and clients, emphasizing the need to carefully consider societal changes in practice.
JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY
(2021)
Article
Physics, Fluids & Plasmas
Kristian Stolevik Olsen
Summary: This paper investigates the motion characteristics of self-propelled particles with variable angular velocity over time, mimicking the behavior of synthetic active matter systems. The orientational correlation function and effective diffusivity are analyzed using Langevin dynamics simulations and perturbative methods.
Review
Physics, Multidisciplinary
Igor S. Aranson
Summary: Bacteria, as one of the oldest and most abundant species on Earth, play a significant role in various ecological cycles and can cause infectious diseases. Bacterial suspensions, as examples of active matter, exhibit complex collective behavior. This study provides a critical assessment of the progress in bacterial active matter from a physics perspective, covering experimental results and theoretical approaches.
REPORTS ON PROGRESS IN PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Jyoti Sharma, Ishant Tiwari, P. Parmananda, M. Rivera
Summary: This study reports experiments on an active camphor rotor. It shows that an irregular rotor can be transformed into a periodic rotor with the assistance of suitable external periodic forcing. Additionally, synchronized bursting between two coupled irregular rotors is observed.
Article
Energy & Fuels
Rene Behmann, Jack Phan, Artur Root, Michael Schmidt, Wolfgang G. Bessler
Summary: This study demonstrates the feasibility of integrating a commercial lithium-ion battery into a commercial micro-PV system. Simulations and experiments were conducted to evaluate the impact of battery and PV size on self-consumption, self-sufficiency, and cost savings. The results show that both passive and active coupling architectures can achieve stable operation and shift PV energy from day to night.
Article
Chemistry, Physical
F. Orts, M. Maier, M. Fuchs, G. Ortega, E. M. Garzon, A. M. Puertas
Summary: The dynamics of a tracer particle in a bath of quasi-hard colloidal spheres is investigated using Langevin dynamics simulations and mode coupling theory. The study reveals that the size of the tracer particle has a significant impact on its motion, as well as on the dynamics of the bath particles.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Jyoti Sharma, Ishant Tiwari, Dibyendu Das, P. Parmananda
Summary: The study demonstrates the existence of chimeralike states in an ensemble of homogeneous coupled oscillators, specifically in active camphor ribbons. These states are characterized by the coexistence of synchronized and unsynchronized groups within the ensemble. The experimental results were successfully reproduced using a numerical model simulating the repulsive Yukawa interactions between the ribbons.
Article
Mechanics
Tirthankar Banerjee, Robert L. Jack, Michael E. Cates
Summary: This study investigates the dynamics of tracer particles in one-dimensional systems consisting of active and passive particles. The results show that the behavior of the tracer particles is influenced by the density of the surrounding environmental particles.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Physics, Fluids & Plasmas
Deping Huang, Yunfei Du, Huijun Jiang, Zhonghuai Hou
Summary: Confinement has significant effects on the collective dynamics of active systems. In a modeled active system in circular confinement, biased active particles can spontaneously form a spiral vortex near the boundary with nonmonotonic dependencies on the biased angle and the strength of the anisotropic interaction. This work provides insights into dynamic behaviors and designing ordered collective behaviors.
Article
Neurosciences
Eric Avila, Kaushik J. Lakshminarasimhan, Gregory C. DeAngelis, Dora E. Angelaki
Article
Neurosciences
Jean Laurens, Dora E. Angelaki
JOURNAL OF NEUROPHYSIOLOGY
(2019)
Article
Multidisciplinary Sciences
Jean Laurens, Dora E. Angelaki
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Multidisciplinary Sciences
Dora E. Angelaki, Julia Ng, Amada M. Abrego, Henry X. Cham, Eftihia K. Asprodini, J. David Dickman, Jean Laurens
NATURE COMMUNICATIONS
(2020)
Article
Biochemistry & Molecular Biology
Jean-Paul Noel, Ling-Qi Zhang, Alan A. Stocker, Dora E. Angelaki
Summary: Individuals with autism spectrum disorder (ASD) show deficits in sensory encoding, reflecting a lack in processing sensory information. Additionally, adaptation to changing stimulus statistics also differs between neurotypical and ASD groups, with ASD individuals exhibiting lower encoding capacity.
Article
Biology
Valeria Aguillon-Rodriguez, Dora Angelaki, Hannah Bayer, Niccolo Bonacchi, Matteo Carandini, Fanny Cazettes, Gaelle Chapuis, Anne K. Churchland, Yang Dan, Eric Dewitt, Mayo Faulkner, Hamish Forrest, Laura Haetzel, Michael Hausser, Sonja B. Hofer, Fei Hu, Anup Khanal, Christopher Krasniak, Ines Laranjeira, Zachary F. Mainen, Guido Meijer, Nathaniel J. Miska, Thomas D. Mrsic-Flogel, Masayoshi Murakami, Jean-Paul Noel, Alejandro Pan-Vazquez, Cyrille Rossant, Joshua Sanders, Karolina Socha, Rebecca Terry, Anne E. Urai, Hernando Vergara, Miles Wells, Christian J. Wilson, Ilana B. Witten, Lauren E. Wool, Anthony M. Zador
Summary: Research on measuring mouse behavior has yielded reproducible results across multiple laboratories, showing that once training is complete, there are no significant differences in behavior across labs. Additionally, mice in different labs adopted similar strategies for decision-making.
Article
Biology
Akis Stavropoulos, Kaushik J. Lakshminarasimhan, Jean Laurens, Xaq Pitkow, Dora Angelaki
Summary: This study investigated the impact of sensory observation and latent control dynamics on human path integration using a novel motion-cueing algorithm. The results showed that vestibular signals alone are unable to support accurate path integration without sustained acceleration. Furthermore, the study found that performance in all conditions reflected a failure to fully adapt to changes in the underlying control dynamics.
Article
Biology
HyungGoo R. Kim, Dora E. Angelaki, Gregory C. DeAngelis
Summary: The detection of object motion in a scene during self-motion is not well understood. Neurons in the macaque middle temporal area have been found to have incongruent depth tuning for binocular disparity and motion parallax cues, and they play a role in predicting perceptual decisions during the detection of moving objects.
Article
Biology
Seren Zhu, Kaushik J. Lakshminarasimhan, Nastaran Arfaei, Dora E. Angelaki, Hang Zhang
Summary: This study examines the characteristics of gaze during visually-guided navigation, showing that the spatial distribution and temporal evolution of gaze are significantly influenced by environmental complexity.
Article
Biology
Jean-Paul Noel, Sabyasachi Shivkumar, Kalpana Dokka, Ralf M. Haefner, Dora E. Angelaki
Summary: Autism spectrum disorder (ASD) is a disorder characterized by social, communicative, and sensory anomalies. Computational psychiatry aims to understand the underlying computations that give rise to the heterogeneous phenotypes observed in ASD. This study suggests that individuals with ASD have different internal models for attributing world causes to sensory signals compared to neurotypical individuals, and that there may be an explicit compensatory mechanism in ASD to counterbalance their bias towards integration.
Article
Biology
Jean-Paul Noel, Edoardo Balzani, Eric Avila, Kaushik J. Lakshminarasimhan, Stefania Bruni, Panos Alefantis, Cristina Savin, Dora E. Angelaki
Summary: This study provides insights into the operation and coordination of neural nodes in naturalistic self-environment interactions. The findings suggest that different brain areas code for different variables during a task involving catching fireflies in virtual reality, with MSTd and dlPFC forming a functional subnetwork that plays a crucial role in indicating the animals' gaze position.
Article
Biology
Jean-Paul Noel, Johannes Bill, Haoran Ding, John Vastola, Gregory C. DeAngelis, Dora E. Angelaki, Jan Drugowitsch
Summary: A key computation in building adaptive internal models of the external world is the process of causal inference, which assigns sensory signals to their likely cause(s). Existing studies have mainly focused on causal inference in two-alternative forced-choice tasks, while less is known about its application in naturalistic action-perception loops. This study examines the disambiguation of retinal motion caused by self- and/or object-motion during closed-loop navigation. Normative accounts and empirical findings suggest that humans tend to misattribute object-motion to the self, especially during passive self-motion and when targets are presented eccentrically. The study also reveals the modulation of gaze pursuit by target velocity during object-only motion, but not during concurrent object- and self-motion. These findings contribute to our understanding of causal inference within action-perception loops.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Review
Behavioral Sciences
Jean-Paul Noel, Dora E. Angelaki
Summary: Autism spectrum disorder (ASD) has a wide range of impacts on behaviors and neural functions, leading to numerous theories at different levels of description. Our proposal aims to relate existing behavioral, computational, algorithmic, and neural accounts of ASD to each other. We suggest that ASD can be seen as a disorder of causal inference at the computational level, which relies on divisive normalization at the algorithmic level. Impairments in divisive normalization may be caused by excitatory-to-inhibitory imbalances at the neural implementation level. We also explore similar frameworks, such as predictive coding and circular inference, in relation to ASD. Our goal is to inspire efforts in unifying the various explanations of ASD.
TRENDS IN COGNITIVE SCIENCES
(2023)
Article
Biology
Jean Laurens, Sheng Liu, Xiong-Jie Yu, Raymond Chan, David Dickman, Gregory C. DeAngelis, Dora E. Angelaki