Let HF be the collection of the hereditarily finite well-founded sets and let the primitive language of set theory be the first-order language which contains binary symbols for equality and membership only. As announced in a previous paper by the authors, "Truth in V for ∃*∀∀-sentences is decidable," truth in HF for ∃*∀∀-sentences of the primitive language is decidable. The paper provides the proof of that claim.

Hfs paper is an analysis of the concept of contentment and its relationship to the notions of happiness and the good life. Many philosophers have argued that the concept of happiness can be defined or analyzed simply in terms of "contentment" or "being satisfied (or pleased) with one' s life."' Others have made the more modest claim that being satisfied with one' s life is necessary for being a happy person. Philosophers have also discussed the place of contentment in the (...) good life. Few of them attach any great value to contentment. (The stoics are a notable exception to this.) Nietzsche goes so far as to say that being contented is incompatible with having a good life. I will propose an analysis of the concept of contentment in the first section of the paper. Then, I will consider the relationship between happiness and contentment and argue that being contented (with one's life) is neither necessary nor sufficient for being a happy person. In the final section of the paper, I will propose and defend a view concerning the normative significance of contentment and its place in the good life. (shrink)

Heart rate variability (HRV), the change in the time intervals between adjacent heartbeats, is an emergent property of interdependent regulatory systems that operate on different time scales to adapt to challenges and achieve optimal performance. This article briefly reviews neural regulation of the heart, and its basic anatomy, the cardiac cycle, and the sinoatrial and atrioventricular pacemakers. The cardiovascular regulation center in the medulla integrates sensory information and input from higher brain centers, and afferent cardiovascular system inputs to adjust heart (...) rate and blood pressure via sympathetic and parasympathetic efferent pathways. This article reviews sympathetic and parasympathetic influences on the heart, and examines the interpretation of HRV and the association between reduced HRV, risk of disease and mortality, and the loss of regulatory capacity. This article also discusses the intrinsic cardiac nervous system and the heart-brain connection, through which afferent information can influence activity in the subcortical and frontocortical areas, and motor cortex. It also considers new perspectives on the putative underlying physiological mechanisms and properties of the ultra-low-frequency (ULF), very-low-frequency (VLF), low-frequency (LF), and high-frequency (HF) bands. Additionally, it reviews the most common time and frequency domain measurements as well as standardized data collection protocols. In its final section, this article integrates Porges' polyvagal theory, Thayer and colleagues' neurovisceral integration model, Lehrer et al.'s resonance frequency model, and the Institute of HeartMath's coherence model. The authors conclude that a coherent heart is not a metronome because its rhythms are characterized by both complexity and stability over longer time scales. Future research should expand understanding of how the heart and its intrinsic nervous system influence the brain. (shrink)

L’équipe de Clio HFS m’a demandé de participer au numéro « Relectures » préparé pour le 15e anniversaire de la revue. Nous devions le faire sous forme d’interview que nos indisponibilités réciproques ont rendu impossible. Je réponds donc, par écrit, à quelques-unes des questions posées par Florence Rochefort et Françoise Thébaud. L’inconvénient est la perte de spontanéité que suscite l’inattendu d’un entretien. J’ai plutôt le sentiment de m’inscrire en l’occurrence dans la suite des Essais d’...

The HealthyFood program offers members up to 25% cash back monthly on healthy food purchases. In this randomized controlled trial, we tested the efficacy of financial incentives combined with text messages in increasing healthy food purchases among HF members. Members receiving the lowest cash back level were randomized to one of six arms: Arm 1 : 10% cash back, no weekly text, standard monthly text; Arm 2: 10% cash back, generic weekly text, standard monthly text; Arm 3: 10% cash back, (...) personalized weekly text, standard monthly text; Arm 4: 25% cash back, personalized weekly text, standard monthly text; Arm 5: 10 + 15%NET cash back, personalized weekly text, standard monthly text; and, Arm 6: 10 + 15%NET cash back, personalized weekly text, unbundled monthly text. In the 10 + 15%NET cash back, the cash back amount was the baseline 10% plus 15% of the net difference between healthy and unhealthy spending. The generic text included information on HF and healthy eating, while the personalized text had individualized feedback on purchases. The standard monthly text contained the cash back amount. The unbundled monthly text included the amount lost due to unhealthy purchases. The primary outcome was the average monthly percent healthy food spending. Secondary outcomes were the percent unhealthy food spending, and the percent healthy and unhealthy food items. Of the members contacted, 20 opted out, and 2841 met all inclusion criteria. There were no between-arm differences in the examined outcomes. The largest mean difference in percent healthy spending was between Arm 1 and Arm 2, and the largest mean difference in percent unhealthy spending was also between Arm 1 and Arm 2, but no differences were statistically significant after correction for multiple comparisons. None of the tested financial incentive structures or text strategies differentially affected food purchasing. Notably, more than doubling the cash back amount and introducing a financial disincentive for unhealthy purchases did not affect purchasing. These findings speak to the difficulty of changing shopping habits and to the need for innovative strategies to shift complex health behaviors. NCT02486588 Increasing Engagement with a Healthy Food Benefit. The trial was prospectively registered on July 1, 2015. (shrink)

Dynamic intra-individual variability (IIV) in cardiac vagal control across multiple situations is believed to contribute to adaptive cognition under stress; however, a dearth of research has empirically tested this notion. To this end, we examined 25 U.S. Army Soldiers (all male, Mean Age= 30.73, SD = 7.71) whose high-frequency heart rate variability (HF-HRV) was measured during a resting baseline and during three conditions of a shooting task (training, low stress, high stress). Response inhibition was measured as the correct rejection of (...) friendly targets during the low and high stress conditions. We tested the association between the standard deviation of HF-HRV across all four task conditions (IIV in vagal control) and changes in response inhibition between low and high stress. Greater differences in vagal control between conditions (larger IIV) were associated with higher tonic vagal control during rest, and stronger stress-related decreases in response inhibition. These results suggest that flexibility in vagal control is supported by tonic vagal control, but this flexibility also uniquely relates to adaptive cognition under stress. Findings are consistent with neurobehavioral and dynamical systems theories of vagal function. (shrink)

The purpose of the study is to explore a new research methodology that will improve our understanding of “flow” through indicators of physiological and qualitative state. We examine indicators of “flow” experienced by musicians of a youth string quartet, two women (25, 29) and two men (23, 24). Electrocardiogram (ECG) equipment was used to record heart rate variability (HRV) data throughout the four movements in one and the same quartet performed during two concerts. Individual physiological indicators of flow were supplemented (...) by assessments of group “state flow” (means from standardized questionnaires) and a group interview in which the musicians provided qualitative data. A matrix was constructed for the characterization of different kinds of demands in the written music in each one of the four movements for each one of the musicians. HRV derived from ECG data showed non-significant trends for group state flow across the eight musical episodes. Individual-level analysis showed that compared to the other players the first violin player had the highest mean heart rate and the lowest increase in high frequency (HF) power in HRV during this particular movement, particularly during the second concert. The qualitative data illustrated how an interplay of synchronized social interactions between this player and their colleagues during the musical performance was associated with a feeling of group state flow and served to support the first violinist. The case illustrates that the proposed mixed methodology drawing on physiological and qualitative data, has the potential to provide meaningful information about experiences of a flow state, both at individual and group levels. Applications in future research are possible. (shrink)

Let $\mathfrak{U}$ be an admissible structure. A $\mathrm{cPC}_d(\mathfrak{U})$ class is the class of all models of a sentence of the form $\neg\exists\bar{K} \bigwedge \Phi$, where $\bar{K}$ is an $\mathfrak{U}$-r.e. set of relation symbols and $\phi$ is an $\mathfrak{U}$-r.e. set of formulas of $\mathscr{L}_{\infty\omega}$ that are in $\mathfrak{U}$. The main theorem is a generalization of the following: Let $\mathfrak{U}$ be a pure countable resolvable admissible structure such that $\mathfrak{U}$ is not $\Sigma$-elementarily embedded in $\mathrm{HYP}(\mathfrak{U})$. Then a class $\mathbf{K}$ of countable structures (...) whose universes are sets of urelements is a $\mathrm{cPC}_d(\mathfrak{U})$ class if and only if for some $\Sigma$ formula $\sigma$ (with parameters from $\mathfrak{U}$), $\mathfrak{M}$ is in $\mathbf{K}$ if and only if $\mathfrak{M}$ is a countable structure with universe a set of urelements and $(\mathrm{HYP}_\mathfrak{U}(\mathfrak{M}), \mathfrak{U}, \mathfrak{M}) \models \sigma$, where $\mathrm{HYP}_\mathfrak{U}(\mathfrak{M})$, the smallest admissible set above $\mathfrak{M}$ relative to $\mathfrak{U}$, is a generalization of $\mathrm{HYP}$ to structures with similarity type $\Sigma$ over $\mathfrak{U}$ that is defined in this article. Here we just note that when $\mathrm{L}_\alpha$ is admissible, $\mathrm{HYP}_{\mathrm{L}\alpha}(\mathfrak{M})$ is $\mathrm{L}_\beta(\mathfrak{M})$ for the least $\beta \geq \alpha$ such that $\mathrm{L}_\beta(\mathfrak{M})$ is admissible, and so, in particular, that $\mathrm{HYP}_{\mathbb{HF}}(\mathfrak{M})$ is just $\mathrm{HYP}(\mathfrak{M})$ in the usual sense when $\mathfrak{M}$ has a finite similarity type. The definition of $\mathrm{HYP}_\mathfrak{U}(\mathfrak{M})$ is most naturally formulated using Adamson's notion of a +-admissible structure (1978). We prove a generalization from admissible to +-admissible structures of the well-known truncation lemma. That generalization is a key theorem applied in the proof of the generalized Spector-Gandy theorem. (shrink)

To foster understanding in the psychopathology of patients with anorexia nervosa at the psychological and physiological level, standardized experimental studies on reliable biomarkers are needed, especially due to the lack of disorder-specific samples. To this end, the autonomic nervous system response to a psychosocial stressor was investigated in n = 19 PAN, age, and gender-matched to n = 19 healthy controls. For this purpose, heart rate and heart rate variability parameters were assessed in a cross-sectional study design under two experimental (...) conditions: rest and stress. In addition, psychological indicators of stress were assessed. An 2 × 2 × 8 ANOVA demonstrated similar HR and HRV patterns between PAN and HC at rest. Under stress, PAN demonstrated a blunted HR [condition*time*group: F = 9.326, p = 0.000, η2 = 0.206] and an attenuated HRV response. Significant effects of stress appraisal and BMI on HRV-reactivity were revealed. SA on SDNN = Condition*time*SA = F = 2.676, p = 0.033, η2 = 0.073. BMI on LF/HF-Ratio = Condition*time*BMI = F = 3.339, p = 0.019, η2 = 0.164. Psychological indices suggested higher levels of chronic and appraised stress in PAN relative to HC. Additional analyses demonstrated that ED-symptoms are highly correlated with the latter constructs, as well as with psychological burden, but not with weight. Further, it was shown that abnormalities in reactivity persisted despite normalized ANS activity. Overall, we suggested that besides weight recovery, improvement in stress appraisal could be beneficial for cardiac health. In this light, a combination of therapy and biofeedback training may improve treatment outcomes and regulate stress reactivity. (shrink)

There is a broad consensus in nutritional-microbiota research that high-fat (HF) diets are harmful to human health, at least in part through their modulation of the gut microbiota. However, various studies also support the inherent flexibility of the human gut and our microbiota’s ability to adapt to a variety of food sources, suggesting a more nuanced picture. In this article, we first discuss some problems facing basic translational research and provide a different framework for thinking about diet and gut health (...) in terms of metabolic flexibility. We then offer evidence that well-formulated HF diets, such as ketogenic diets, may provide healthful alternative fuel sources for the human gut. We place this in the context of cancer research, where this concern over HF diets is also expressed, and consider various potential objections concerning the effects of lipopolysaccharides, trimethylamine-N-oxide, and secondary bile acids on human gut health. We end by providing some general suggestions for how to improve research and clinical practice with respect to the gut microbiota when considering the framework of metabolic flexibility. (shrink)

Throughout Theodor Adorno’s Negative Dialectics moral philosophy is discussed only indirectly, as a subject which is relevant to the more primary discussions of freedom and world history, among others. In the relatively recently released English translation of the History and Freedom lectures, however, moral philosophy is more explicitly discussed, but even there its subject matter is of secondary importance to the more fundamental discussions of the philosophy of history and of freedom. In fact, that moral philosophy is an auxiliary concern (...) in these lectures reveals much about how Adorno views moral philosophy. Perhaps a trivial detail but revealing nonetheless, the lecture entitled ‘Transition to Moral Philosophy’ points to something quite essential about Adorno’s moral philosophy. In this lecture Adorno attempts to show that his previous discussions of the philosophy of history have direct bearing on the concept of freedom. He claims that his task is to articulate “what we [can glean]…about the problem of freedom, from the discussions of the philosophy of history” (HF, 177). Adorno rightfully believes that freedom, the ability to act (in some way) without being determined to do so, is a precondition of one’s actions being considered on moral grounds, of one being held morally accountable for such actions. Surely, therefore, it is appropriate that a transition takes place from discussing freedom to discussing moral philosophy. There is something else going on here, however, that reveals the peculiar nature of Adorno’s moral philosophy. The above quote reveals that the philosophy of history conditions the problem of freedom, and therefore moral philosophy for Adorno. The following paper attempts to show how Adorno’s moral philosophy is situated within his more foundational considerations of the philosophy of history and of freedom. As a result of it being so situated it also attempts to argue that the History and Freedom lectures reveal that the task for moral philosophy is the critique of moral philosophy. (shrink)

Les deux auteurs qui nous ont déjà donné en 1996, sur un sujet similaire, La Drôle de guerre des sexes du cinéma français : 1930-1956 (dont Brigitte Rollet a rendu compte dans Clio HFS, n°7) se livrent là à un exercice difficile qui représente un vrai tour de force : faire en 128 pages un bilan des approches genrées dans les études cinématographiques, une étude comparée entre la France et les États-Unis et une mise au point sur des films tournés (...) des années 1930 au plus contemporain. Ce bilan... (shrink)

This study investigates how Human Factors is applied when designing and developing Immersive Visual Technologies, including Augmented Reality, Mixed Reality, and Virtual Reality. We interviewed fourteen people working at different organizations, that develop IVT applications in the Nordic region. We used thematic analysis to derive themes from the interviews. The results showed an insufficient knowledge and application of HF in IVT development, due to the lack of awareness of both scope and significance of HF, resource allocation strategy, market inertia, stakeholder's (...) involvement, standardization of HF application and IVT uses, and technology maturity. This situation could be improved by allocating experts, adjusting organizational strategy to balance resource allocation, training developers and user organizations to raise awareness and to encourage co-creative design and knowledge sharing, create a sense of ownership amongst stakeholders, and ensure the usefulness of the technology to the user's work. (shrink)

Despite increasing popularity and intensive worldwide use, few studies have assessed the validity and factorial structure of the Heartland Forgiveness Scale. However, scientific literature showed that the original factorial structure of the HFS was not fully replicated and—in addition—the Italian translation is still lacking. To fill this gap, this study aims to extend evidence about the original HFS factorial validity by analyzing the Italian version. The final sample was composed of 523 randomly enrolled participants [139 males, 384 females ] aged (...) from 18 to 82 years who completed the Italian version of the HFS. The confirmatory factor analysis showed good fit indices for the original hierarchical factor solution and a significant decrease in model fit was found for all of the competing models. Also, the Italian version of the HFS revealed good reliability and very good psychometrical properties. Findings suggest that the Italian version of the HFS can be considered a reliable and good psychometrically based instrument for the assessment of dispositional forgiveness of the Self, Other, and Situation. (shrink)

The hippocampal formation is a structure critical to navigation and many forms of memory. In mammals, the firing of place cells is widely regarded as the fundamental unit of HF information processing. Supporting homology between the avian and mammalian HF, context-specific patterns of Egr1 have been reported in birds that are comparable to those produced by place cell firing in mammals. Recent electrophysiological data, however, suggest that many avian species lack place cells, potentially undermining the correspondence between Egr1 and place (...) cell-related firing in the avian brain. To clarify this, the current study examines Egr1 expression in Japanese quail under conditions known to elicit only weakly spatially modulated firing patterns and report robust context-dependent Egr1 expression. These data confirm that context-dependent expression of Egr1 is not dependent on precise place fields and provide insight into how these birds are able to perform complex spatial tasks despite lacking mammalian-like place cells. (shrink)

BackgroundMental stress and imbalance of its two neural stress systems, the autonomic nervous system and the hypothalamic–pituitary–adrenal axis, are associated with chronic prostatitis/chronic pelvic pain syndrome and erectile dysfunction. However, the comprehensive analyses of psychological stress and stress systems are under-investigated, particularly in CP/CPPS patients complicated by lower urinary tract symptoms and ED.Materials and methodsParticipants were 95 patients in CP/CPPS+ED group, 290 patients in CP/CPPS group, 124 patients in ED group and 52 healthy men in control group. The National Institutes (...) of Health Chronic Prostatitis Symptom Index, the International Index of Erectile Function-5 and the International Prostate Symptom Score were used for assessing the disease severity of CP/CPPS, LUTS and ED. Psychometric self-report questionnaires including the Beck Anxiety Inventory, Perceived Stress Scale, Type A Personality Test and Symptom Checklist 90 were completed for distress from physical symptoms. Twenty-five subjects per group were randomly selected for further investigating the changes of the HPA axis and ANS. Saliva samples were taken on 3 consecutive days at 8 specific times with strict reference to time of morning awakening for evaluation of free cortisol. Heart rate variability as marker of the ANS was measured using 24 h electrocardiography, and time-and frequency-domain variables were analyzed.ResultsThe BAI and SCL-90 scores were significantly higher in the CP/CPPS+ED, CP/CPPS and ED groups compared with the control group. The PSS scores of both groups with ED were significantly higher than the control group. Compared with the CP/CPPS group, the differences of PSS, SCL-90 and TAPT scores were statistically significant in CP/CPPS+ED patients. The IPSS scores were shown to have significantly positive correlations with BAI, PSS and SCL-90 in the CP/CPPS patients. However, in all subjects, the IIEF-5 scores were shown to have significantly negative correlations with BAI, PSS, SCL-90 and quality of life score in NIH-CPSI. Cortisol awakening response parameters and diurnal cortisol levels did not significantly vary between the four groups. Time-dependent parameters of HRV also did not differ significantly across groups. In the frequency domain analysis, low frequency was significantly lower in ED patients when compared with CP/CPPS+ED patients and healthy controls, high frequency power was significantly higher in healthy controls compared to patients with ED, CP/CPPS and CP/CPPS+ED, and the CP/CPPS+ED group had significantly higher LF/HF ratio than the control group.ConclusionCP/CPPS and ED patients score exceedingly high on most psychosocial variables. The symptom scores of LUTS and ED positively correlate with the severity of psychological stress. Our findings also suggest that the ANS sympathovagal imbalance is associated with ED and LUTS in CP/CPPS, whereas HPA axis activity is not. (shrink)

En décembre 2000, le comité de rédaction de CLIO, Histoire, Femmes et Sociétés m'a donné la responsabilité fort agréable d'animer une table ronde des répresentant/e/s de six revues européennes de l'histoire des femmes. Chaque revue, Arenal (Espagne), Cender & History (Royaume Uni), L'Homme. Z.F.G. (Autriche), Sextant (Belgique), Memoria (Italie), Genesis (Italie) – et CLIO HFS elle-même – a, naturellement, une histoire bien particulière. Elles ont été créées entre 1981 et 1995, et l'une d'ent...

Le 20 janvier 2006 CLIO-HFS a fêté son dixième anniversaire. Dans l’amphithéâtre de l’EHESS, 105 boulevard Raspail, nous étions 250 environ venus écouter en cette circonstance deux femmes dont les relations à l’histoire sont différentes et complémentaires : Assia Djebar, Algérienne, membre de l’Académie française, auteure de nombreux romans écrits en français sur l’histoire, les femmes, les relations entre les générations ou entre les sexes ; et Michelle Perrot, historienne qu’on ne présente...

Entre los diversos temas que permean la Educación en Ciencias (EC), se enfatizan los modos de enseñanza y aprendizaje con foco en los aspectos conceptuales y cognitivos. Este ensayo tiene como objetivo presentar una Filosofía de la Educación en Ciencias (FEC) basada en la Hermenéutica Filosófica (HF) de Hans-Georg Gadamer con el fin de promover un camino ontológico para la EC que pueda sortear el énfasis mencionado. La FEC está constituida por la intersección de tres campos académicos: Filosofía, Filosofía de (...) la Educación y Filosofía de la Ciencia. En Filosofía, el movimiento de comprender entender de manera ontológica explorado por Gadamer permite ver la Hermenéutica más allá de un carácter metodológico. En la Filosofía de la Educación, la HF se extiende a la apropiación del conocimiento, agregando una formación personal en la que hay exposición a la duda, valoración del diálogo, escucha del otro y búsqueda de la comprensión del mundo, pero también de uno mismo. En la Filosofía de la Ciencia, la perspectiva gadameriana permite una visión del trabajo científico en una racionalidad que se entrelaza con aspectos históricos, filosóficos y culturales a través de una aproximación entre la Hermenéutica y las Ciencias Naturales. Señalamos que una EC en la articulación entre estos campos con sesgo gadameriano promueve cambios en la dinámica escolar, en la disposición del alumno y del docente, en la forma de entenderse a sí mismo, al mundo y al lenguaje científico. (shrink)

:High-fidelity simulation is a relatively new teaching modality, which is gaining widespread acceptance in medical education. To date, dozens of studies have proven the usefulness of HFS in improving student, resident, and attending physician performance, with similar results in the allied health fields. Although many studies have analyzed the utility of simulation, few have investigated why it works. A recent study illustrated that permissive failure, leading to simulated mortality, is one HFS method that can improve long-term performance. Critics maintain, however, (...) that the use of simulated death is troubling and excessive. Given the controversy regarding simulated death, we consider the data about the educational value and the emotional harms associated with them, expecting that evidence could be useful in resolving the question. The goal of this narrative review is to explore the argument against simulated mortality and provide educators with an imperative as to why it can be safely utilized. (shrink)

This research drew on the authors’ long experience in the implementation of the “_Hikmah_ Pedagogy” which is based on the Philosophy for Children’s teaching method. Specifically, the study examined the influence of the pedagogy on the participants’ perceptions of and feelings about their thinking and reasoning skills. The sample comprised 188 Malaysian and international students from an international secondary school in Malaysia. This consisted of students in four Grade levels, ranging from Grades 7 to 10. An instrument named “_Hikmah_ Feedback (...) Survey - HFS” was employed for data collection. The findings were supportive of the positive influence of the pedagogy on students’ abilities to think and reason better after experiencing the programme. Furthermore, the participants demonstrated a considerable improvement in their cognitive and social-communicative skills, as evidenced in the scores obtained for the post-programme’s test. This affirms the fact that the _ḥikmah_ pedagogy is highly recommended in Malaysia’s march towards its Vision 2020 developmental goals. Implications of the study were discussed and suggestions were proposed to educators and stakeholders in secondary school education. (shrink)

Skin is a comparatively accessible organ possessing many conserved regulatory and signaling pathways, drawing researchers from varied fields toward its study. Hair follicle (HF) biology in particular has expanded rapidly over the preceding decade, helping to shape and develop scientific knowledge across diverse areas of biomedical research, beyond the skin. The hope in compiling this review is to inspire more researchers to utilize the HF as an instructive biological model, bringing with them fresh perspectives and experience from differing fields of (...) study. The authors also wish to further motivate seasoned hair researchers to explore the further reaches of their understanding and the discoveries yet to be made. For this reason, the authors have endeavored to collate an eclectic mix of some of the most thought‐provoking and scientifically intriguing articles associated with the field of HF research, published in the preceding two years. (shrink)

Exponential mappings into an imaginary space or number field for the axioms of a theory, which are in the form of propositional constants and variables, make possible: (a) an understanding of the meaning and differences between the Lorentz transformation constants, such that their product is still equal to one, but the axioms at each end of the transformations are logically inverse and separately consistent; (b) an interpretation of the psi function phase factor which is part of the axiomE=hf; (c) the (...) unification of the quantum-mechanical psi function and the electromagnetic wave function. Thus, those statements whose mechanisms are unknown (the axioms of the theory) are to be assigned the axiom propositional number symbol ϑ and are to be associated with the complex probability eiϑ, which is a uniform factor of the energy equations expressing the physical state. Such probabilistic axiom functions can be associated with both the special theory of relativity and the quantum-electromagnetic theory. (shrink)

Heart rate variability (HRV) is an indicator of the regulation of the heart, see Task Force (Circulation 93(5):1043–1065, 1996). This study compares the regulation of the heart in two cases of healthy subjects within real life situations: Marathon runners and shift workers. After an update on the state of the art on HRV processing, we specify our probabilistic model: We choose modeling heartbeat series by locally stationary Gaussian process (Dahlhaus in Ann Stat 25, 1997). HRV is then processed by the (...) combination of two statistical methods: (1) Continuous wavelet transform for calculating the spectral density energy in the high frequency (HF) and low frequency (LF) bands and (2) Change point analysis to detect changes of heart regulation. Next, we plot the variations of the HF and LF energy in extreme conditions for both populations. This puts in light, that physical activities (rest, moderate sport, marathon race) can be ordered in a logical continuum. This allows to define a new index based on HF and LF energy that is log HF + log LF which appears relevant to measure HR regulation. The results obtained are pertinent but have to be completed by further studies. (shrink)

Competitive sports involve physiological, technical and psychological skills, which influence directly on individuals’ performance. This study aims to investigate the levels of perceived stress and Heart Rate Variability before and after matches with victory and defeat in professional eSports athletes. Our hypothesis was that the winners would have better autonomic and stress responses after match, thus corroborating the literature on neurocardiac connections. Fifty male eSport players were selected players from 10 different Brazilian teams. The experiment was carried out in 2 (...) sessions. Firstly, after signing the informed consent form, 24 h before the game, anthropometric, physical activity levels and time of expertise data were recorded only for sample characterization and the players were familiarized with the perceived stress scale—10 and the HRV measurements. Secondly, players performed the PSS-10 and HRV recording at rest by 10 min 60 and 30 min before the game and 10 min after the end of the game. Overall, concerning PSS-10 our findings show that VG had significant reduced scores in post-game time compared to baseline and pre-game times, while DG had significant increased scores in post-game time compared to BL and pre-game times. Regarding HRV, our results demonstrate that VG had significant increase in RR, SDNN, rMSSD, pNN50 and HF, and significant decrease in LF and LF/HF, while DG had a significant decrease in RR, SDNN, rMSSD and HF, and significant increase in LF and LF/HF. It was observed that VG had better HRV responses as well as lower levels of perceived stress, while DG had worst HRV responses and higher levels of perceived stress. (shrink)

The vestibulo-ocular reflex plays an important role in controlling the gaze at a visual target. Although patients with vestibular hypofunction aim to improve their VOR function, some retain dysfunction for a long time. Previous studies have explored the effects of direct current stimulation on vestibular function; however, the effects of random noise stimulation on eye–head coordination have not previously been tested. Therefore, we aimed to clarify the effects of high frequency noisy vestibular stimulation on eye–head coordination related to VOR function. (...) Thirteen healthy young adult participants with no serious disease took part in our study. The current amplitude and density used were 0.4 mA and 0.2 mA/cm2, respectively, with a random noise frequency of 100–640 Hz. The electrodes were located on both mastoid processes. The stimulus duration and fade in/out duration were 600 and 10 s, respectively. Subjects oscillated their head horizontally, gazing at the fixation point, at 1 Hz for 30 repetitions. The coordination of eye–head movements was measured by eye-tracking and a motion capture system. Peak-to-peak angles for eye and head movement and deviation of the visual line from the fixation target revealed no significant differences between HF-nVS and sham. The lag time between the eye and head movement with HF-nVS post-stimulation was significantly shorter than that of the sham. We found that HF-nVS can reduce the lag time between eye and head movement and improve coordination, contributing to a clear retinal image. This technique could be applied as a form of VOR training for patients with vestibular hypofunction. (shrink)

The role of encoding/retrieval conditions compatibility was investigated in a reality-monitoring task. An experiment was conducted which showed a positive effect of reinstating distinctive encoding operations at test. That is, generation of a low-frequency word from the same word fragment at study and test significantly enhanced item recognition memory. However, reinstating of relatively more automatic operations of reading or generating a highfrequency word did not influence recognition performance. Moreover, LF words were better recognized than HF words, but memory for source (...) did not depend on the encoding/retrieval match or on the word-frequency. In comparison with reading, generating an item at study significantly enhanced source memory but generating it at test had no effect. The data were analysed using a multinomial modelling approach which allowed ruling out the influence of a response bias on the measurement of memory ability. (shrink)

The characteristic features of ortho- and para-helium are investigated within the framework of Relativistic Schrödinger Theory (RST). The emphasis lies on the conceptual level, where the geometric and physical properties of both RST field configurations are inspected in detail. From the geometric point of view, the striking feature consists in the splitting of the $\mathfrak{u}(2)$ -valued bundle connection $\mathcal{A}_{\mu}$ into an abelian electromagnetic part (organizing the electromagnetic interactions between the two electrons) and an exchange part, which is responsible for their (...) exchange interactions. The electromagnetic interactions are mediated by the usual four-potentials A μ and thus are essentially the same for both types of field configurations, where naturally the electrostatic forces (described by the time component A 0 of A μ) dominate their magnetostatic counterparts (described by the space part A of A μ). Quite analogously to this, the exchange forces are as well described in terms of a certain vector potential (B μ), again along the gauge principles of minimal coupling, so that also the exchange forces split up into an “electric” type ( $\rightsquigarrow B_{0}$ ) and a “magnetic” type ( $\rightsquigarrow {\bf B}$ ). The physical difference of ortho- and para-helium is now that the first (ortho-) type is governed mainly by the “electric” kind of exchange forces and therefore is subject to a stronger influence of the exchange phenomenon; whereas the second (para-) type has vanishing “electric” exchange potential (B 0 ≡ 0) and therefore realizes exclusively the “magnetic” kind of interactions ( $\rightsquigarrow {\bf B}$ ), which, however, in general are smaller than their “electric” counterparts. The corresponding ortho/para splitting of the helium energy levels is inspected merely in the lowest order of approximation, where it coincides with the Hartree–Fock (HF) approximation. Thus RST may be conceived as a relativistic generalization of the HF approach where the fluid-dynamic character of RST implies many similarities with the density functional theory. (shrink)

Érotiques, le titre du dossier du numéro 31 de Clio HFS peut intriguer. D’emblée, disons qu’il ne s’agit pas d’un adjectif qui caractériserait les femmes et les hommes dont il sera question dans ce numéro, comme d’autres titres de la revue pourraient le suggérer. Pas davantage celles et ceux qui y ont contribué. Il ne dénote pas non plus le ton des articles du dossier qui reste, on le déplorera peut-être, d’autant plus marqué par l’austérité universitaire que le sujet paraît (...) ne pas l’être. En... (shrink)