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Noise induced

Shogo Yonekura, Yasuo Kuniyoshi
Organisms generate a variety of noise types, including neural noise, sensory noise, and noise resulting from fluctuations associated with movement. Sensory and neural noises are known to induce stochastic resonance (SR), which improves information transfer to the subjects control systems, including the brain. As a consequence, sensory and neural noise provide behavioral benefits, such as stabilization of posture and enhancement of feeding efficiency. In contrast, the benefits of fluctuations in the movements of a biological system remain largely unclear...
2017: PloS One
Haoran Guo, Enmin Ding, Ying Bai, Hengdong Zhang, Huanxi Shen, Jun Wang, Xianping Song, Wenyan Cai, Jiadi Guo, Baoli Zhu
Noise induced hearing loss (NIHL), a multifactorial disease involving both genetic and environmental factors, is one of the most important occupational health hazards. Nonetheless, the influence of FOXO3 variants on NIHL risk have not been illuminated. This research was conducted to explore the effects of FOXO3 polymorphisms on individual susceptibility to NIHL. A total of 2689 industrial workers from one textile factory of east China were recruited to participate in the current research. Venous blood was collected, questionnaire and pure-tone audiometry (PTA) was conducted by specialist physicians...
2017: PloS One
Atsushi Noguchi, Rekishu Yamazaki, Yutaka Tabuchi, Yasunobu Nakamura
We demonstrate ultrasensitive measurement of fluctuations in a surface-acoustic-wave (SAW) resonator using a hybrid quantum system consisting of the SAW resonator, a microwave (MW) resonator, and a superconducting qubit. The nonlinearity of the driven qubit induces parametric coupling, which up-converts the excitation in the SAW resonator to that in the MW resonator. Thermal fluctuations of the SAW resonator near the quantum limit are observed in the noise spectroscopy in the MW domain.
November 3, 2017: Physical Review Letters
Tobias Grafke, Michael E Cates, Eric Vanden-Eijnden
We model an enclosed system of bacteria, whose motility-induced phase separation is coupled to slow population dynamics. Without noise, the system shows both static phase separation and a limit cycle, in which a rising global population causes a dense bacterial colony to form, which then declines by local cell death, before dispersing to reinitiate the cycle. Adding fluctuations, we find that static colonies are now metastable, moving between spatial locations via rare and strongly nonequilibrium pathways, whereas the limit cycle becomes almost periodic such that after each redispersion event the next colony forms in a random location...
November 3, 2017: Physical Review Letters
Guram Gogia, Justin C Burton
Multistability is an inseparable feature of many physical, chemical, and biological systems which are driven far from equilibrium. In these nonequilibrium systems, stochastic dynamics often induces switching between distinct states on emergent time scales; for example, bistable switching is a natural feature of noisy, spatially extended systems that consist of bistable elements. Nevertheless, here we present experimental evidence that bistable elements are not required for the global bistability of a system...
October 27, 2017: Physical Review Letters
Stephanie K Sayler, Peter M Rabinowitz, Linda F Cantley, Deron Galusha, Richard L Neitzel
OBJECTIVE: This study characterised overall and specific costs associated with hearing conservation programmes (HCPs) at US metal manufacturing sites, and examined the association between these costs and several noise-induced hearing loss (NIHL) outcomes. DESIGN: We interviewed personnel and reviewed records at participating facilities. We also measured noise for comparison to the ten-year average of measurements made by each facility. NIHL outcomes assessed included rates of standard threshold shifts (STS) and high-frequency hearing loss, as well as prevalence of hearing impairment, for each participating facility...
December 7, 2017: International Journal of Audiology
Johannes B Finke, Mauro F Larra, Martina U Merz, Hartmut Schächinger
Facial self-resemblance has been associated with positive emotional evaluations, but this effect may be biased by self-face familiarity. Here we report two experiments utilizing startle modulation to investigate how the processing of facial expressions of emotion is affected by subtle resemblance to the self as well as to familiar faces. Participants of the first experiment (I) (N = 39) were presented with morphed faces showing happy, neutral, and fearful expressions which were manipulated to resemble either their own or unknown faces...
2017: PloS One
Qing Guo, Fangyi Wan
The different Poisson noise-induced complete synchronization of the global coupled dynamical network is investigated. Based on the stability theory of stochastic differential equations driven by Poisson process, we can prove that Poisson noises can induce synchronization and sufficient conditions are established to achieve complete synchronization with probability 1. Furthermore, numerical examples are provided to show the agreement between theoretical and numerical analysis.
2017: PloS One
Peijun Tang, Shaojie Liu, Junbo Chen, Zhiling Yuan, Bingkai Xie, Jianhua Zhou, Zhilie Tang
We developed a cross-correlation photothermal optical coherence tomography (CC-PTOCT) system for photothermal imaging with high lateral and axial resolution. The CC-PTOCT system consists of a phase-sensitive OCT system, a modulated pumping laser, and a digital cross-correlator. The pumping laser was used to induce the photothermal effect in the sample, causing a slight phase modulation of the OCT signals. A spatial phase differentiation method was employed to reduce phase accumulation. The noise brought by the phase differentiation method and the strong background noise were suppressed efficiently by the cross-correlator, which was utilized to extract the photothermal signals from the modulated signals...
December 1, 2017: Optics Letters
Hans Weber, Pejman Ghanouni, Aurea Pascal-Tenorio, Kim Butts Pauly, Brian A Hargreaves
PURPOSE: To explore the temperature-induced signal change in two-dimensional multi-spectral imaging (2DMSI) for fast thermometry near metallic hardware to enable MR-guided focused ultrasound surgery (MRgFUS) in patients with implanted metallic hardware. METHOD: 2DMSI was optimized for temperature sensitivity and applied to monitor focus ultrasound surgery (FUS) sonications near metallic hardware in phantoms and ex vivo porcine muscle tissue. Further, we evaluated its temperature sensitivity for in vivo muscle in patients without metallic hardware...
December 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Amisha Kanji, Katijah Khoza-Shangase, Liepollo Ntlhakana
PURPOSE: The current study aimed to investigate the knowledge of mine workers regarding noise induced hearing loss in the South African gold and non-ferrous mining subsectors. METHOD: A descriptive research design was adopted. Semi-structured interviews were conducted on 90 participants who comprised managers, supervisors and miners. Data was analysed qualitatively. RESULTS: The majority of participants (97%) acknowledged working in a noisy environment and demonstrated knowledge of the consequences of this exposure on their hearing function...
December 7, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
Saeid Golbidi, Huige Li, Ismail Laher
SIGNIFICANCE: Modern technologies have eased our lives but these conveniences can impact our lifestyles in destructive ways. Noise pollution, mental stresses, and smoking (as a stress-relieving solution) are some environmental hazards which affect our well-being and health care budgets. Scrutinizing their pathophysiology could lead to solutions to reduce their harmful effects. Recent advances: Oxidative stress plays an important role in initiating local and systemic inflammation following noise pollution, mental stress, and smoking...
December 6, 2017: Antioxidants & Redox Signaling
Neeraj K Surana, Dennis L Kasper
Microbiome-wide association studies have established that numerous diseases are associated with changes in the microbiota. These studies typically generate a long list of commensals implicated as biomarkers of disease, with no clear relevance to disease pathogenesis. If the field is to move beyond correlations and begin to address causation, an effective system is needed for refining this catalogue of differentially abundant microbes and to allow subsequent mechanistic studies. Here we demonstrate that triangulation of microbe-phenotype relationships is an effective method for reducing the noise inherent in microbiota studies and enabling identification of causal microbes...
December 6, 2017: Nature
Ningqian Wang, Xiong Gan, Yun Liu, Zhongju Xiao
The hippocampus is known as a neuronal structure involved in learning, memory and spatial navigation using multi-sensory cues. However, the basic features of its response to acoustic stimuli without any behavioral tasks (conditioning) remains poorly studied. Here, we investigated the CA3 response to auditory stimuli using in vivo loose-patch recordings in awake and anesthetized C57 mice. Different acoustic stimuli in addition to broadband noise such as click, FM sound and pure tone were applied to test the response of CA3 in awake animals...
2017: Frontiers in Physiology
D Basta, M Gröschel, A Ernst
Noise is an important socioeconomic problem in industrialized countries. Development of efficient treatment options for the audiological phenomena resulting from noise-induced hearing loss requires in-depth understanding of the underlying damage mechanisms causing peripheral and central nervous changes. Mechanical damage, ischemia and excitotoxicity are mainly responsible for noise-induced cell death and biophysical changes in the cochlea. Auditory synaptopathy is an additional consequence. Besides these cochlear pathologies, noise exposure leads to extensive changes within the central auditory pathway...
December 4, 2017: HNO
Naoki Masuyama, Chu Kiong Loo, Farhan Dawood
Adaptive Resonance Theory (ART) is one of the successful approaches to resolving "the plasticity-stability dilemma" in neural networks, and its supervised learning model called ARTMAP is a powerful tool for classification. Among several improvements, such as Fuzzy or Gaussian based models, the state of art model is Bayesian based one, while solving the drawbacks of others. However, it is known that the Bayesian approach for the high dimensional and a large number of data requires high computational cost, and the covariance matrix in likelihood becomes unstable...
November 10, 2017: Neural Networks: the Official Journal of the International Neural Network Society
Shu Peng, Yu-Chen Pan, Yaling Wang, Zhe Xu, Chao Chen, Dan Ding, Yongjian Wang, Dong-Sheng Guo
The introduction of controlled self-assembly into living organisms opens up desired biomedical applications in wide areas including bioimaging/assays, drug delivery, and tissue engineering. Besides the enzyme-activated examples reported before, controlled self-assembly under integrated stimuli, especially in the form of sequential input, is unprecedented and ultimately challenging. This study reports a programmable self-assembling strategy in living cells under sequentially integrated control of both endogenous and exogenous stimuli...
November 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Rose Meleady, Dominic Abrams, Julie Van de Vyver, Tim Hopthrow, Lynsey Mahmood, Abigail Player, Ruth Lamont, Ana C Leite
By leaving their engines idling for long periods, drivers contribute unnecessarily to air pollution, waste fuel, and produce noise and fumes that harm the environment. Railway level crossings are sites where many cars idle, many times a day. In this research, testing two psychological theories of influence, we examine the potential to encourage drivers to switch off their ignition while waiting at rail crossings. Two field studies presented different signs at a busy rail crossing site with a 2-min average wait...
December 2017: Environment and Behavior
Marcel Goldberg, Marie Zins
As other occupational risk factors, like noise, heat or some chemicals, stress at work may induce coronary heart disease. Occupational stress has several components and is usually measured using two different instruments: the Karasek model defines the job strain as the association between high constraints and low latitude at work, whereas the Siegrist model relies on the imbalance between efforts at work and rewards. It is now well established that occupational stress is an independent risk factor of coronary heart disease, the attributable risk fraction being about 3...
November 2017: Médecine Sciences: M/S
Kan Sun, Amanda S Azman
A new noise regulation for the mining industry became effective in 2000, providing a consistent regulatory requirement for both coal and non-coal mining divisions. The new rule required mines to implement hearing conservation programs, including a system of continuous noise monitoring, provision of hearing protection devices, audiometric testing, hearing loss training, and record keeping. The goal of this study was to assess hearing conservation program compliance, and excessive noise exposure and hearing loss risks for both coal and non-coal mining divisions through evaluating MSHA citations...
December 4, 2017: Journal of Occupational and Environmental Hygiene
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