Physical activity, body composition and sedentary behavior may affect the health of children. Therefore, this study examined the effect of an educational hybrid physical education program on physical fitness, body composition and sedentary and PA times in adolescents. A 9-month group-randomized controlled trial was conducted in 150 participants allocated into the control group and experimental group. Cardiorespiratory fitness, speed, strength, agility, flexibility and body mass index were assessed through previously validated field tests. Sedentary time, PA at school and afterschool (...) were evaluated with the Youth Activity Profile-Spain questionnaire. Significant differences were observed concerning to the CG in APA-weekend, speed-agility and agility. Regarding the intervention, cardiorespiratory fitness, speed-agility, strength, flexibility, agility, PA in school, APA-weekday, APA-weekend, APA-week, and sedentary time increased significantly in the EG. The use of a hybrid program based on teaching personal and social responsibility and gamification strategies produced enhancements in cardiorespiratory fitness, agility, speed, APA-weekdays and APA-weekends, reducing the sedentary time. (shrink)

Time processing is a multifaceted skill crucial for managing different aspects of life. In the current work, we explored the relationship between interoception and time processing by examining research on clinical models. We investigated whether time processing deficits are associated with dysfunction of the interoceptive system and/or insular cortex activity, which is crucial in decoding internal body signaling. Furthermore, we explored whether insular activation predicts the subjective experience of time (that is, the subjective duration of a (...) target stimulus to be timed). Overall, our work suggests that alteration of the interoceptive system could be a common psychophysiological hallmark of mental disorders affected by time processing deficits. (shrink)

In recent years, embodied cognitive agents have become a central research focus in Cognitive Science. We suggest that there are at least three aspects of embodiment| physical, social and temporal|which must be treated simultaneously to make possible a realistic implementation of agency. In this paper we detail the ways in which attention to the temporal embodiment of a cognitive agent (perhaps the most neglected aspect of embodiment) can enhance the ability of an agent to act in the world, both in (...) itself, and also by supporting more robust integrations with the physical and social worlds. (shrink)

This essay analyzes the time of human activity. It begins by discussing how most accounts of action treat the time of action as succession, using Donald Davidson's account of action as illustration. It then argues that an adequate account of action and its determinants, one able to elucidate the ``indeterminacy of action,'' requires an alternative conception of action time. The remainder of the essay constructs a propitious account of the time and determination of action. It does (...) so by critically drawing on Henri Bergson's notion of duration and Martin Heidegger's notion of the teleological dimensionality (past, present, and future) of existence. Whereas Bergson provides valuable insights into the continuity of activity, Heidegger illuminates the determination of action. Combining their insights yields an account of the time of activity that supplements succession with a nonsuccessive temporality: the time of activity is an overlapping continuum of action performances each of which is structured as coming towards an end starting from a motivating state of affairs. The essay concludes with brief thoughts on what justifies calling the nonsuccessive dimensionality of existence a kind of time. (shrink)

This study introduces 'time-specific' analysis of economic processes. Economic processes are conventionally analysed from one point in time to another over a series of time units - days, weeks, or years. By contrast, these time-specific models focus on the temporal character of events within the unit time - their timing, duration, and sequence - utilizing the information that is lost in the macroscopic time perspective of standard economic theory. What time-specific analysis reveals are (...) economic and technological characteristics of goods and services - prices and cost behaviour and temporal mobility or immobility within the unit time - that affect capital productivity and its utilization, optimal schedules of production, work, and consumption, least-cost methods of producing time-shaped outputs, and efficient welfare-maximizing behavior in time-specific, including peak-load, markets. (shrink)

In the present study the impact of need for cognitive closure manipulations via time pressure and explicit closure goal activation on executive control was investigated. Although there is some evidence that NFC, measured as an individual variable, is related to better performing in attentional tasks involving executive control, these results have never been validated across different manipulations of NFC. Thus, in the present study we induced NFC via internal and external time pressure and tested the impact of these (...) manipulations on the performance in tasks that measure executive control, i.e., the Stroop and switching tasks. The results revealed that induced high NFC, indeed boosted performance in executive control tasks. Moreover, there was no difference in the effect of both NFC manipulations on task performance. The implications regarding the role of executive control and specific NFC manipulations in social cognition are discussed. (shrink)

& The functional equivalence of overt movements and dynamic imagery is of fundamental importance in neuroscience. Here, we investigated the participation of the neocortical motor areas in a classic task of dynamic imagery, Shepard and Metzler's mental rotation task, by time-resolved single-trial functional Magnetic Resonance Imaging (fMRI). The subjects performed the mental-rotation task 16 times, each time with different object pairs. Functional images were acquired for each pair separately, and the onset times and..

Physical activity and sedentary behaviour have been linked to the mental health of children and adolescents, yet the timing of behaviours may play a role in this relationship and clarifying this could inform interventions. We explored cross-sectional associations of PA and SED in varying time segments throughout the school day with the mental health of school-aged children and adolescents from rural Northeastern Ontario, Canada. A total of 161 students wore accelerometers for 8 days and completed a self-report survey. Mental (...) health was measured using the Strengths and Difficulties Questionnaire. Accelerometer-measured SED, light PA, and moderate and vigorous PA were estimated in the time-segments before school, school time, after school, and evenings. Associations were tested with multilevel linear regressions while adjusting for confounding factors. Students spent 72.6 min in MVPA, 209.0 min in LPA, and 621.0 min in SED per day. Daily SED was associated with less conduct problems. Evening LPA was inversely associated with hyperactivity, while SED was associated with hyperactivity and with peer problems before school, and during school. No associations were observed for MVPA, emotional symptoms, or prosocial behaviour. In conclusion, displacing SED with LPA in some specific periods of the day may benefit the mental health of students; taking this into account could strengthen interventions. (shrink)

There is considerable appeal to the Aristotelian idea that taking pleasure in an activity is sometimes simply a matter of attending to it in such a way as to render it wholehearted. However, the proponents of this idea have not made adequately clear what kind of attention it is that can perform the surprising feat of transforming otherwise indifferent activities into pleasurable ones. I build upon Gilbert Ryle's suggestion that taking pleasure in an activity is tantamount to engaging in the (...) activity while fervently desiring to do it and it alone. More specifically, I draw upon insights into the sort of evaluative attention involved in having a desire to generate corollary insights into the sort of attention that makes activity pleasurable. My aim is to offer a compelling account of a certain class of pleasures, and to shed light on their relation to reasons. I argue that prospective pleasures in this class are not always reasons for action, and that even when they are reasons they have this status only derivatively, as vivid apprehensions of an independent realm of values. This does not mean that such pleasures are never good. They are good provided that they track real values, for then they constitute a proper savoring of one's activities and/or circumstances, and provide a valuable respite from the distractions and unwarranted doubts that so often leave us at odds with ourselves and alienated from our own doings. (shrink)

The cell assembly model of language posits that words are laid down in the cortex by discrete sets of neurons distributed over specific parts of the brain. The strong internal links of these “word webs” may not only bind articulatory and acoustic knowledge of a lexical item, they may also link word and meaning; for example, by connecting neuron populations related to word forms to those of actions and perceptions to which the words refer. Therefore, the cortical activation elicited by (...) words should reflect aspects of word meaning, a postulate that has received strong support from recent work using neurophysiological and metabolic imaging. Segalowitz & Lane make the point that this neurobiological model can also be used to predict reaction times in behavioral experiments, using the behavioral distinction between content and function words as an example. We acclaim their view, but warn that response times might be related to different mechanisms at the neuronal level, including the cortical distribution and internal connectivity of cell assemblies along with their mutual connections in the grammatical (syntactic and semantic) network. (shrink)

The problem of adaptive finite-time fault-tolerant control and output constraints for a class of uncertain nonlinear half-vehicle active suspension systems are investigated in this work. Markovian variables are used to denote in terms of different random actuators failures. In adaptive backstepping design procedure, barrier Lyapunov functions are adopted to constrain vertical motion and pitch motion to suppress the vibrations. Unknown functions and coefficients are approximated by the neural network. Assisted by the stochastic practical finite-time theory and FTC (...) theory, the proposed controller can ensure systems achieve stability in a finite time. Meanwhile, displacement and pitch angle in systems would not violate their maximum values, which imply both ride comfort and safety have been enhanced. In addition, all the signals in the closed-loop systems can be guaranteed to be semiglobal finite-time stable in probability. The simulation results illustrate the validity of the established scheme. (shrink)

Objective: To clarify whether long time constant is useful for detecting the after-slow activity of epileptiform discharges : sharp waves and spikes and for differentiating EDs from sharp transients.Methods: We employed 68 after-slow activities preceded by 32 EDs and 36 Sts from 52 patients with partial and generalized epilepsy defined by visual inspection. High-frequency activity associated with the apical component of EDs and Sts was also investigated to endorse two groups. After separating nine Sts that were labeled by visual (...) inspection but did not fulfill the amplitude criteria for after-slow of Sts, 59 activities were analyzed about the total area of after-slow under three TCs.Results: Compared to Sts, HFA was found significantly more with the apical component of EDs. The total area of after-slow in all 32 EDs under TC 2 s was significantly larger than those under TC 0.3 s and 0.1 s. Conversely, no significant differences were observed in the same parameter of 27 Sts among the three different TCs. Regarding separated nine Sts, the total area of after-slow showed a similar tendency to that of 27 Sts under three different TCs.Significance: These results suggest that long TC could be useful for selectively endorsing after-slow of EDs and differentiating EDs from Sts. These findings are concordant with the results of the HFA analysis. Visual inspection is also equally good as the total area of after-slow analysis. (shrink)

In July 2012, based on evidence from two major trials, the United States Food and Drug Administration approved the use of combined oral tenofovir/emtricitabine as pre-exposure prophylaxis for people at high risk of HIV acquisition. PrEP effectiveness is marred by poor adherence, however, even in trial populations, thus it is not a magic bullet for HIV prevention. It is, however, the most effective biomedical HIV prevention intervention available for people at high risk of HIV, particularly those who have receptive sex (...) and lack the power to negotiate condom use. Accordingly, there are compelling reasons to compare future experimental HIV prevention interventions against PrEP. The interests both of trial participants and of science are served by using PrEP as comparator: Not only would HIV incidence be reduced, but also the question of whether new interventions were superior to best proven interventions, in a given setting, would be answered comprehensively. (shrink)

A critical discussion is provided of three central assumptions underlying Nunez's approach to modeling cortical activity. A plea is made for neurophysiologically realistic models involving nonlinearities, multiple time scales, and stochasticity.