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Sample Entropy of the Heart Rate Reflects Properties of the System Organization of Behaviour
Entropy. 2018. Vol. 20. No. 6. P. 1–22.
Bakhchina A., Arutyunova K., Sozinov A., Demidovskij A., Alexandrov Y.
Cardiac activity is involved in the processes of organization of goal-directed behaviour. Each behavioural act is aimed at achieving an adaptive outcome and it is subserved by the actualization of functional systems consisting of elements distributed across the brain and the rest of the body. This paper proposes a system-evolutionary view on the activity of the heart and its variability. We have compared the irregularity of the heart rate, as measured by sample entropy (SampEn), in behaviours that are subserved by functional systems formed at different stages of individual development, which implement organism-environment interactions with different degrees of differentiation. The results have shown that SampEn of the heart rate was higher during performing tasks that included later acquired knowledge (foreign language vs. native language; mathematical vocabulary vs. general vocabulary) and decreased in the stress and alcohol conditions, as well as at the beginning of learning. These results are in line with the hypothesis that irregularity of the heart rate reflects the properties of a set of functional systems subserving current behaviour, with higher irregularity corresponding to later acquired and more complex behaviour.
Levashev V., / Series arXiv "math". 2026. No. 2609.06010.
We prove that continuous A-bilinear pairings on the ring of Laurent series that are invariant under continuous automorphisms coincide, up to a constant, with the pairing given by the residue of a differential form over any commutative associative ring with identity. ...
Added: September 24, 2026
Pyatov P. N., Pivovarov P. A., / Series math "arxiv.org". 2026. No. 2609.06274.
We investigate a special ansats that allows for an iterative solution of the constant Yang-Baxter equation. Testing this ansatz, we construct four sequences of the constant R-matrices. In each sequence the R-matrices act on the tensor squares of vector spaces of linearly growing dimensions. Each R-matrix also depends on a single complex parameter.
By analyzing the ...
Added: September 24, 2026
Medvedev V., / Series arXiv "math". 2026.
We study complete static manifolds with boundary admitting a nowhere-vanishing static potential. Our main result shows that, under a natural lower bound relating the scalar curvature and the boundary mean curvature, a simple static manifold with boundary must in fact have positive scalar curvature, negative boundary mean curvature, and be compact; we also obtain explicit ...
Added: September 19, 2026
Poddiakov A., / Series Social Science Research Network "Social Science Research Network". 2026. No. 7437658.
Clarity of knowledge and reasoning is necessary in many cases. Yet vagueness in scientific thinking related to surprise, curiosity, "ability to engage with not-knowing" (de Freitas) and abductive reasoning is also a crucially important source of scientific creativity which supplements combinatorial logic when dealing with the already known. Starting from studies by C. S. Peirce ...
Added: September 15, 2026
Glutsyuk A., / Series arXiv "math". 2026.
B.Josephson (Nobel Prize, 1973) predicted a tunnelling effect for a system of two superconductors separated by a narrow dielectric (such a system is called Josephson junction): existence of a supercurrent through it and equations governing it. The overdamped Josephson junction is modeled by the family of differential equations on the 2-torus, dθdτ=1ω(cosθ+B+Acosτ), which is known as ...
Added: September 8, 2026
Portnova G., Proskurnina E., Liaukovich K. et al., Journal of Molecular Neuroscience 2026 Vol. 76 No. 1 P. 19
Added: September 5, 2026
Pochinka O., Shmukler V., / Series math.RT "arXiv:1808.06395 [math.RT]". 2026.
Anosov flows have a long and rich history, firstly motivated by the
study of geodesic flows in negative curvature surface by Anosov and Sinai.
Not every closed manifold admits an Anosov flow for well-known reasons:
the fundamental group of a 3-manifold M admitting an Anosov flow must
have exponential growth, and M must be universally covered by R3. Nevertheless,
there ...
Added: August 31, 2026
Shabanov N., Kuricheva O., Kurbatova J. et al., / Series Working Papers SSRN "Department of Economics Ca’ Foscari University of Venice". 2026.
The carbon balance of an ecosystem is the difference between Gross Primary Productivity (GPP) and Ecosystem Respiration (Reco) as expressed by Net Ecosystem Exchange (NEE). While remote sensing retrievals of GPP have reached maturity, Reco estimation remains underexplored and ultimately cast bias on NEE. Here we present an end-to-end multi-scale analysis of the mechanism of ...
Added: August 21, 2026
Ponomarenko A., / Series Computer Science "arxiv.org". 2025.
This paper addresses the challenge of merging hierarchical navigable small world (HNSW) graphs, a critical operation for distributed systems, incremental indexing, and database compaction. We propose three algorithms for this task: Naive Graph Merge (NGM), Intra Graph Traversal Merge (IGTM), and Cross Graph Traversal Merge (CGTM). These algorithms differ in their approach to vertex selection ...
Added: July 30, 2026
Loubenets E. R., / Series arxiv.org "quant-ph". 2026. No. 2607.18050.
In many quantum applications it is important to know whether or not a Bell nonlocal two-qudit state exhibits its nonlocality under correlation scenarios with some given numbers S1,S2≥1 of generalized quantum measurements at two sites. In the present article, we find analytically a new general locality condition sufficient for a nonseparable Werner state with a ...
Added: July 21, 2026
Bolbachan V., / Series math "arxiv.org". 2024.
Chow polylogarithms are some special functions arising in explicit description of the Beilinson regulator map. The most interesting functional equation for this function reflects its vanishing on the boundary in the Bloch's cycle complex. We show that this functional equation formally follows from more simple ones, namely skew-symmetry, functoriality and multiplicativity.
To prove this, we study ...
Added: July 16, 2026
Bolbachan V., / Series math "arxiv.org". 2024.
Let K be a field of characteristic zero. We prove that its motivic cohomology in degree m−1 and weight m is rationally isomorphic to the cohomology of the polylogarithmic complex. This gives a partial extension of A. Suslin theorem describing the indecomposable K3 of a field. ...
Added: July 16, 2026
Panov V., Ryabchenko A., / Series arXiv "stat.ME". 2026. No. 2607.05048.
This paper investigates the problem of statistical inference for a mixture distribution consisting of a discrete and a continuous component, with a particular focus on the class of rational-infinitely divisible distributions. We consider non-parametric estimation of both components of the mixture as well as the quasi-L{é}vy measure, assuming that the mixture belongs to the class ...
Added: July 9, 2026
Васильчук М. С., Шаньков Ф. М., Chumakova M. et al., Psychology. Journal of the Higher School of Economics 2021 Vol. 18 No. 2 P. 247–258
The 2019 Coronavirus disease outbreak leads to negative psychological outcomes not only for healthcare workers and patients, but also for the general public. S. Hobfoll’s Conservation of Resources theory is one of the most applicable models for conceptualizing and evaluating natural and social catastrophes and their impact. A web-based screening has been conducted at the ...
Added: June 30, 2026
Piontkovski D., / Series arXiv "math". 2026.
A noncommutative projective variety is defined, following Artin and Zhang, by a graded coherent algebra 𝐴. The category of coherent sheaves is then the quotient qgr(𝐴) of the category of finitely presented graded modules by the subcategory of torsion modules. We consider the categorical and polynomial entropies of the Serre twist, that is, of the ...
Added: June 23, 2026
Piontkovski D., / Series arXiv "math". 2025.
If a symmetric multilinear algebra is weakly nil, then it is Engel. This result may be regarded as an infinite-dimensional analogue of the well-known Jacobian theorem, which states that if a polynomial mapping has a polynomial inverse, then its Jacobian matrix is invertible. This refines a theorem of Gerstenhaber and partially answers a question posed ...
Added: June 23, 2026
Konakov V., Kucher D., Mammen E., / Series arXiv "math". 2026. No. 2606.11142v1.
In this paper, we construct strong approximations for discrete-time Markov chains weakly converging to continuous diffusion processes, as well as for their perturbed counterparts. Under the assumption of bounded coefficients, we construct closely coupled versions of these processes on a shared probability space. In particular, for both non-degenerate and degenerate cases, we maximize the probability ...
Added: June 11, 2026
Dorri Sedeh S., Kosonogov V., Kerimova N. et al., Frontiers in Psychology 2026 Vol. 17 Article 1710257
Introduction:
As cities continue to grow, access to natural environments is becoming more limited, contributing to increased stress levels in urban populations. Panoramic 360° videos provide a creative and scalable means of simulating natural environments, potentially reducing stress in city residents under controlled settings. Here, we examined whether short immersive experiences in different urban environments support ...
Added: May 25, 2026
Букина А. А., Eritsyan K., Современная зарубежная психология 2026 Т. 15 № 1 С. 106–116
Context and relevance. This article provides an overview of approaches to the study of self-care practices — an important aspect of health and well-being that is currently attracting growing interest. Objective. To systematize the knowledge on self-care practices available in contemporary international scientific literature. Methods and materials. Narrative literature review. Conclusions. Analysis of the studies ...
Added: April 1, 2026
Portnova G., Proskurnina E., Liaukovich K. et al., Journal of Molecular Neuroscience 2026 Vol. 76 Article 19
This study investigates the relationship between stress coping ability, salivary antioxidant capacity (AOC), and trace element concentrations, focusing on zinc (Zn) and potassium (K). A cohort of 73 participants, divided into groups based on stress coping ability (SCA) (“adaptive”, “intermediate”, and “maladaptive”), underwent cognitive tasks while physiological and behavioral data were collected. Saliva samples were ...
Added: February 2, 2026
Ходаковская Э. Н., Nartova-Bochaver S. K., Социальная психология и общество 2025 Т. 16 № 4 С. 109–126
Context and relevance. Modern student youth is a group of high psychological vulnerability due to high social pressure and contextual tensions caused by global and local threats. Identification of difficult life situations (DLS)of modern students is necessary for well-organized support of their psychological well-being. Objective. To investigate the frequency and patterns of DLS observed by ...
Added: August 23, 2025
Sofya Nartova-Bochaver, Zolotareva A., Delvecchio E. et al., International Journal of Psychology 2025 Vol. 60 No. 5 Article 70096
Hedonic and eudaimonic well-being were studied depending on indicators of distress in countries with cultures differing in survival/self-realisation values. A total of 2216 respondents from Chile, China, Italy, Russia and the United States participated. The Psychological Well-Being Scale, the Satisfaction With Life Scale, and the Depression, Anxiety, Stress Scale were used. Findings provided evidence that in countries with high survival ...
Added: August 3, 2025
Chermoshentseva K., Этнопсихолингвистика 2024 № 3(18) С. 78–95
The paper examines the discursive metaphor PREGNANCY IS JOURNEY as a tool for dealing with stress among pregnant women, used in modern Englishlanguage discourse. The object of the study is the metaphor of travel and its idiosyncratic variations and extensions in discourse of pregnant women. The subject of the study is the possibility of using ...
Added: April 9, 2025
Antonova N., В кн.: Психология бизнеса: учебник для вузов.: М.: Юрайт, 2023. С. 263–319.
В главе анализируется специфика психологической помощи субъектам бизнеса, приводятся методики диагностики стресса и профессиональной деформации субъектов бизнеса, стратегии и техники психологической помощи (индивидуального психологического консультирования и коучинга). ...
Added: March 5, 2025