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multiscale entropy

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https://www.readbyqxmd.com/read/28628398/skill-level-changes-the-coordination-and-variability-of-standing-posture-and-movement-in-a-pistol-aiming-task
#1
Ji-Hyun Ko, Dong-Wook Han, Karl M Newell
The study investigated the coordination and variability of posture and pistol motion for skilled pistol shooters and novices in a pistol-aiming task. The participants stood on a force platform and held a pistol with the preferred arm to aim for accuracy to a target on 30 s trials. The results revealed that the amount of the centre of pressure (COP) and pistol motion was lower for the expert than novice group. The time-varying structure of COP as indexed by multiscale entropy (MSE) and detrended fluctuation analysis (DFA) was also lower for the expert than the novice group...
June 19, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28599118/sensory-metrics-of-neuromechanical-trust
#2
William Softky, Criscillia Benford
Today digital sources supply a historically unprecedented component of human sensorimotor data, the consumption of which is correlated with poorly understood maladies such as Internet addiction disorder and Internet gaming disorder. Because both natural and digital sensorimotor data share common mathematical descriptions, one can quantify our informational sensorimotor needs using the signal processing metrics of entropy, noise, dimensionality, continuity, latency, and bandwidth. Such metrics describe in neutral terms the informational diet human brains require to self-calibrate, allowing individuals to maintain trusting relationships...
June 9, 2017: Neural Computation
https://www.readbyqxmd.com/read/28592844/the-complexity-of-standing-postural-sway-associates-with-future-falls-in-community-dwelling-older-adults-the-mobilize-boston-study
#3
Junhong Zhou, Daniel Habtemariam, Ikechukwu Iloputaife, Lewis A Lipsitz, Brad Manor
Standing postural control is complex, meaning that it is dependent upon numerous inputs interacting across multiple temporal-spatial scales. Diminished physiologic complexity of postural sway has been linked to reduced ability to adapt to stressors. We hypothesized that older adults with lower postural sway complexity would experience more falls in the future. 738 adults aged ≥70 years completed the Short Physical Performance Battery test (SPPB) test and assessments of single and dual-task standing postural control...
June 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28507237/multiscale-ordinal-network-analysis-of-human-cardiac-dynamics
#4
M McCullough, M Small, H H C Iu, T Stemler
In this study, we propose a new information theoretic measure to quantify the complexity of biological systems based on time-series data. We demonstrate the potential of our method using two distinct applications to human cardiac dynamics. Firstly, we show that the method clearly discriminates between segments of electrocardiogram records characterized by normal sinus rhythm, ventricular tachycardia and ventricular fibrillation. Secondly, we investigate the multiscale complexity of cardiac dynamics with respect to age in healthy individuals using interbeat interval time series and compare our findings with a previous study which established a link between age and fractal-like long-range correlations...
June 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28495840/nonlinearities-of-heart-rate-variability-in-animal-models-of-impaired-cardiac-control-contribution-of-different-time-scales
#5
Luiz Eduardo Virgilio Silva, Renata Maria Lataro, Jaci Airton Castania, Carlos Alberto Aguiar Silva, Helio C Salgado, Rubens Fazan, Alberto Porta
Heart rate variability (HRV) has been extensively explored by traditional linear approaches (e.g. spectral analysis). However, several studies have pointed to the presence of nonlinear features in HRV, suggesting that linear tools might fail to account for the complexity of the HRV dynamics. Even though the prevalent notion is that HRV is nonlinear, the actual presence of nonlinear features is rarely verified. In this study, the presence of nonlinear dynamics was checked as a function of time scales in three experimental models of rats with different impairment of the cardiac control, namely rats with heart failure (HF), spontaneously hypertensive rats (SHRs) and sinoaortic denervated (SAD) rats...
May 11, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28484994/associations-of-blood-glucose-dynamics-with-antihyperglycemic-treatment-and-glycemic-variability-in-type-1-and-type-2-diabetes
#6
K-D Kohnert, P Heinke, L Vogt, P Augstein, A Thomas, E Salzsieder
AIMS: The dynamical structure of glucose fluctuation has largely been disregarded in the contemporary management of diabetes. METHODS: In a retrospective study of patients with diabetes, we evaluated the relationship between glucose dynamics, antihyperglycemic therapy, glucose variability, and glucose exposure, while taking into account potential determinants of the complexity index. We used multiscale entropy (MSE) analysis of continuous glucose monitoring data from 131 subjects with type 1 (n = 18), type 2 diabetes (n = 102), and 11 nondiabetic control subjects...
May 8, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28462498/refined-multiscale-fuzzy-entropy-based-on-standard-deviation-for-biomedical-signal-analysis
#7
Hamed Azami, Alberto Fernández, Javier Escudero
Multiscale entropy (MSE) has been a prevalent algorithm to quantify the complexity of biomedical time series. Recent developments in the field have tried to alleviate the problem of undefined MSE values for short signals. Moreover, there has been a recent interest in using other statistical moments than the mean, i.e., variance, in the coarse-graining step of the MSE. Building on these trends, here we introduce the so-called refined composite multiscale fuzzy entropy based on the standard deviation (RCMFEσ) and mean (RCMFEμ) to quantify the dynamical properties of spread and mean, respectively, over multiple time scales...
May 2, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28437466/stage-call-cardiovascular-reactivity-to-audition-stress-in-musicians
#8
Theerasak Chanwimalueang, Lisa Aufegger, Tricia Adjei, David Wasley, Cinzia Cruder, Danilo P Mandic, Aaron Williamon
Auditioning is at the very center of educational and professional life in music and is associated with significant psychophysical demands. Knowledge of how these demands affect cardiovascular responses to psychosocial pressure is essential for developing strategies to both manage stress and understand optimal performance states. To this end, we recorded the electrocardiograms (ECGs) of 16 musicians (11 violinists and 5 flutists) before and during performances in both low- and high-stress conditions: with no audience and in front of an audition panel, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28383496/measuring-complexity-and-predictability-of-time-series-with-flexible-multiscale-entropy-for-sensor-networks
#9
Renjie Zhou, Chen Yang, Jian Wan, Wei Zhang, Bo Guan, Naixue Xiong
Measurement of time series complexity and predictability is sometimes the cornerstone for proposing solutions to topology and congestion control problems in sensor networks. As a method of measuring time series complexity and predictability, multiscale entropy (MSE) has been widely applied in many fields. However, sample entropy, which is the fundamental component of MSE, measures the similarity of two subsequences of a time series with either zero or one, but without in-between values, which causes sudden changes of entropy values even if the time series embraces small changes...
April 6, 2017: Sensors
https://www.readbyqxmd.com/read/28336915/a-novel-method-of-evaluating-knee-joint-stability-of-patients-with-knee-osteoarthritis-multiscale-entropy-analysis-with-a-knee-aiming-task
#10
Diange Zhou, Shijie Zhang, Hui Zhang, Long Jiang, Jue Zhang, Jing Fang
Deteriorating knee stability is a local risk factor that reflects the occurrence and aggregative of osteoarthritis (OA). Despite the many biomechanics-based methods for assessing the structural stability of knee joints in clinics, these methods have many limitations. The stability of the knee joint relies on not only biomechanical factors, but also proprioception and the central nervous system. In this study, we attempt to depict the stability of knee joint from a holistic viewpoint, and a novel index of knee joint stability (IKJS) was thus extracted...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28335804/symbolic-time-series-analysis-of-electroencephalographic-eeg-epileptic-seizure-and-brain-dynamics-with-eye-open-and-eye-closed-subjects-during-resting-states
#11
Lal Hussain, Wajid Aziz, Jalal S Alowibdi, Nazneen Habib, Muhammad Rafique, Sharjil Saeed, Syed Zaki Hassan Kazmi
OBJECTIVE: Epilepsy is a neuronal disorder for which the electrical discharge in the brain is synchronized, abnormal and excessive. To detect the epileptic seizures and to analyse brain activities during different mental states, various methods in non-linear dynamics have been proposed. This study is an attempt to quantify the complexity of control and epileptic subject with and without seizure as well as to distinguish eye-open (EO) and eye-closed (EC) conditions using threshold-based symbolic entropy...
March 23, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28334026/exploring-the-link-between-multiscale-entropy-and-fractal-scaling-behavior-in-near-surface-wind
#12
Miguel Nogueira
The equivalency between the power law behavior of Multiscale Entropy (MSE) and of power spectra opens a promising path for interpretation of complex time-series, which is explored here for the first time for atmospheric fields. Additionally, the present manuscript represents a new independent empirical validation of such relationship, the first one for the atmosphere. The MSE-fractal relationship is verified for synthetic fractal time-series covering the full range of exponents typically observed in the atmosphere...
2017: PloS One
https://www.readbyqxmd.com/read/28328498/a-framework-for-patient-state-tracking-by-classifying-multiscalar-physiologic-waveform-features
#13
Benjamin Vandendriessche, Mustafa Abas, Thomas Dick, Kenneth Loparo, Frank Jacono
OBJECTIVE: State-of-the-art algorithms that quantify nonlinear dynamics in physiologic waveforms are underutilized clinically due to their esoteric nature. We present a generalizable framework for classifying multiscalar waveform features, designed for patient-state tracking directly at the bedside. METHODS: An artificial neural network classifier was designed to evaluate multiscale waveform features against a fingerprint database of multifractal synthetic time series...
March 17, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28323219/effects-of-visual-and-auditory-guidance-on-bimanual-coordination-complexity
#14
Daniela V Vaz, Bruce A Kay, Michael T Turvey
Perceptual guidance of movement with simple visual or temporal information can facilitate performance of difficult coordination patterns. Guidance may override coordination constraints that usually limit stability of bimanual coordination to only in-phase and anti-phase. Movement dynamics, however, might not have the same characteristics with and without perceptual guidance. Do visual and auditory guidance produce qualitatively different dynamical organization of movement? An anti-phase wrist flexion and extension coordination task was performed under no specific perceptual guidance, under temporal guidance with a metronome, and under visual guidance with a Lissajous plot...
March 20, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28318282/altered-resting-state-eeg-complexity-in-children-with-tourette-syndrome-a-preliminary-study
#15
Wen-Chin Weng, Chi-Feng Chang, Lee Chin Wong, Jui-Hsiang Lin, Wang-Tso Lee, Jiann-Shing Shieh
OBJECTIVE: Tourette syndrome is a developmental neuropsychiatric disorder in children, and abnormal corticobasal ganglion connectivity is implied for the pathophysiology. Multiscale entropy, an entropy-based method to measure dynamic complexity at multiple temporal scales, is helpful to disclose the information of brain connectivity. This preliminary study investigated the complexity of resting-state electroencephalogram signals using multiscale entropy in children with Tourette syndrome...
March 20, 2017: Neuropsychology
https://www.readbyqxmd.com/read/28297884/chaotic-dynamics-of-a-swirling-flame-front-instability-generated-by-a-change-in-gravitational-orientation
#16
Hiroshi Gotoda, Hiroaki Kobayashi, Kenta Hayashi
We have intensively examined the dynamic behavior of flame front instability in a lean swirling premixed flame generated by a change in gravitational orientation [H. Gotoda, T. Miyano, and I. G. Shepherd, Phys. Rev. E 81, 026211 (2010)PLEEE81539-375510.1103/PhysRevE.81.026211] from the viewpoints of complex networks, symbolic dynamics, and statistical complexity. Here, we considered the permutation entropy in combination with the surrogate data method, the permutation spectrum test, and the multiscale complexity-entropy causality plane incorporating a scale-dependent approach, none of which have been considered in the study of flame front instabilities...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28290487/cardiac-autonomic-alteration-and-metabolic-syndrome-an-ambulatory-ecg-based-study-in-a-general-population
#17
Yan Ma, Ping-Huei Tseng, Andrew Ahn, Ming-Shiang Wu, Yi-Lwun Ho, Ming-Fong Chen, Chung-Kang Peng
Metabolic syndrome (MetS) has been associated with chronic damage to the cardiovascular system. This study aimed to evaluate early stage cardiac autonomic dysfunction with electrocardiography (ECG)-based measures in MetS subjects. During 2012-2013, 175 subjects with MetS and 226 healthy controls underwent ECG recordings of at least 4 hours starting in the morning with ambulatory one-lead ECG monitors. MetS was diagnosed using the criteria defined in the Adult Treatment Panel III, with a modification of waist circumference for Asians...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28287954/refined-composite-multiscale-dispersion-entropy-and-its-application-to-biomedical-signals
#18
Hamed Azami, Mostafa Rostaghi, Dani Abasolo, Javier Escudero
OBJECTIVE: We propose a novel complexity measure to overcome the deficiencies of the widespread and powerful multiscale entropy (MSE), including, MSE values may be undefined for short signals, and MSE is slow for real-time applications. METHODS: We introduce multiscale dispersion entropy (DisEn - MDE) as a very fast and powerful method to quantify the complexity of signals. MDE is based on our recently developed DisEn, which has a computation cost of O(N), compared with O(N2) for sample entropy used in MSE...
March 8, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28269718/analysis-of-the-sleep-eeg-in-the-complexity-domain
#19
Sara Mariani, Ana F T Borges, Teresa Henriques, Robert J Thomas, Samuel J Leistedt, Paul Linkowski, Jean-Pol Lanquart, Ary L Goldberger, Madalena D Costa
Conventional sleep analysis relies primarily on electroencephalogram (EEG) waveform features assessed in concert with eye movements, respiration and muscle tone. We explore a complementary "complexity domain" approach based on multiscale entropy (MSE) analysis of EEG signals and discuss its relationships to standard sleep analysis and to that based on electrocardiogram (ECG)-derived cardiopulmonary coupling (CPC). We observe a progressive decrease in complexity associated with decreased arousability, as measured by both conventional sleep scoring and CPC analysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269107/memd-enhanced-multivariate-fuzzy-entropy-for-the-evaluation-of-complexity-in-biomedical-signals
#20
Hamed Azami, Keith Smith, Javier Escudero
Multivariate multiscale entropy (mvMSE) has been proposed as a combination of the coarse-graining process and multivariate sample entropy (mvSE) to quantify the irregularity of multivariate signals. However, both the coarse-graining process and mvSE may not be reliable for short signals. Although the coarse-graining process can be replaced with multivariate empirical mode decomposition (MEMD), the relative instability of mvSE for short signals remains a problem. Here, we address this issue by proposing the multivariate fuzzy entropy (mvFE) with a new fuzzy membership function...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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