Physical Tasks Research Articles

Synchronization-based fusion of EEG and eye blink signals for enhanced decoding accuracy.

Decoding locomotor tasks is crucial in cognitive neuroscience for understanding brain responses to physical tasks. Traditional methods like EEG offer brain activity insights but may require additional modalities for enhanced interpretative precision and depth. The integration of EEG with ocular metrics, particularly eye blinks, presents a promising avenue for understanding cognitive processes by combining neural and ocular behaviors. However, synchronizing EEG and eye blink activities poses a significant challenge due to their frequently inconsistent alignment. Our study with 35 participants performing various locomotor tasks such as standing, walking, and transversing obstacles introduced a novel methodology, pcEEG+, which fuses EEG principal components (pcEEG) with aligned eye blink data (syncBlink). The results demonstrated that pcEEG+ significantly improved decoding accuracy in locomotor tasks, reaching 78% in some conditions, and surpassed standalone pcEEG and syncBlink methods by 7.6% and 22.7%, respectively. The temporal generalization matrix confirmed the consistency of pcEEG+ across tasks and times. The results were replicated using two driving simulator datasets, thereby confirming the validity of our method. This study demonstrates the efficacy of the pcEEG+ method in decoding locomotor tasks, underscoring the importance of temporal synchronization for accuracy and offering a deeper insight into brain activity during complex movements.

The Synergistic Effect of Biomechanics and Psychological Feedback in Physical Education Teaching: Enhancing Motor Skills and Psychological Resilience

The combination of biomechanics and psychological feedback presents a unique approach to improving physical education outcomes. Biomechanics offers a detailed understanding of movement, allowing for the optimization of motor skills based on scientific principles. Meanwhile, psychological feedback helps students adapt mentally, fostering resilience and improving performance under pressure. This research explores how the dual application of biomechanical analysis and psychological feedback can enhance both physical and mental capacities in students during physical education. Through motion capture technology and real-time data analysis, motor skill performance is broken down into key components such as force, speed, and coordination. Students receive targeted feedback, allowing them to refine their techniques efficiently. Concurrently, psychological feedback mechanisms, such as self-reflection and stress management strategies, are introduced to help students build mental resilience and maintain focus. Results are a significant improvement in both motor skills and psychological well-being. Students displayed greater accuracy and efficiency in performing complex physical tasks and reported reduced anxiety and stress during physical education activities. The synergy between biomechanics and psychological feedback not only improved motor performance but also enhanced students' overall experience, making physical education more engaging and effective.

Profiles of brain topology for dual-functional stability in old age.

Dual-functional stability (DFS) in cognitive and physical abilities is important for successful aging. This study examines the brain topology profiles that underpin high DFS in older adults by testing two hypotheses: (1) older adults with high DFS would exhibit a unique brain organization that preserves their physical and cognitive functions across various tasks, and (2) any individuals with this distinct brain topology would consistently show high DFS. We analyzed two cohorts of cognitively and physically healthy older adults from the UK (Cam-CAN, n = 79) and the US (CF, n = 48) using neuroimaging data and a combination of cognitive and physical tasks. Variability in DFS was characterized using k-mean clustering for intra-individual variability (IIV) in cognitive and physical tasks. Graph theory analyses of diffusion tensor imaging connectomes were used to assess brain network segregation and integration through clustering coefficients (CCs) and shortest path lengths (PLs). Using support vector machine and regression, brain topology features, derived from PLs + CCs, differentiated the high DFS subgroup from low and mix DFS subgroups with accuracies of 65.82% and 84.78% in Cam-CAN and CF samples, respectively, which predicted cross-task DFS score in CF samples at 58.06% and 70.53% for cognitive and physical stability, respectively. Results showed distinctive neural correlates associated with high DFS, notably varying regional brain segregation and integration within critical areas such as the insula, frontal pole, and temporal pole. The identified brain topology profiles suggest a distinctive neural basis for DFS, a trait indicative of successful aging. These insights offer a foundation for future research to explore targeted interventions that could enhance cognitive and physical resilience in older adults, promoting a healthier and more functional lifespan.

Examining the Independent and Interactive Carryover Effects of Cognitive and Physical Exertions on Physical Performance.

This study compared the effects of prior cognitive, physical, and concurrent exertion on physical performance. Fatiguing cognitive and physical exertions have been shown to negatively affect subsequent task performance. However, it is not clearly understood if concurrent physical and cognitive effort may exaggerate the negative carryover effects on physical task performance when compared to cognitive or physical exertion alone. Twenty-five participants completed four isometric handgrip endurance trials on different days. The endurance trials were preceded by four, 15-minute experimental manipulations (cognitive, physical, concurrent, control). Electromyography (EMG) and force tracing performance were monitored, with handgrip strength measured pre and post. Subjective ratings of mental and physical fatigue, as well as affect, motivation, and task self-efficacy, were also assessed. Handgrip strength decreased following both physical (-14.4% MVC) and concurrent (-12.3% MVC) exertion manipulations, with no changes being observed for the cognitive and control conditions. No differences were observed across conditions for endurance time, EMG, nor tracing performance. When compared to the control conditions, perceptions of mental and physical fatigue were higher following the experimental manipulation. Endurance trial self-efficacy was lower for the mental, physical and concurrent conditions compared to control. The concurrent condition resulted in similar decreases in strength as the physical fatigue condition, but otherwise resulted in similar carryover effects on endurance performance across all conditions. Further study is required at higher exposure levels, or for longer exposure durations, to further probe the influence of concurrent physical and cognitive effort on task performance. Concurrent cognitive and physical effort resulted in similar physical performance decrements to physical effort alone.

Gender differences in the use of an upper-extremity exoskeleton during physically and cognitively demanding tasks- a study protocol for a randomized experimental trial.

Upper limb exoskeletons are recommended to alleviate muscle fatigue, particularly in working conditions inducing musculoskeletal discomfort like overhead work. However, wearing an exoskeleton might introduce cognitive-motor interference, affecting performance. Understanding its neural impact and potential gender differences in design effects is crucial. Therefore, the aim of this study is to examine exoskeleton effects addressing cross-gender comparisons, and exploring the impact on cognitive and physical workload in real-world scenarios. The research questions address the impact of exoskeleton use on muscle synergies, upper body posture, cognitive resources, comfort/discomfort, acceptance and usability. The cross-sectional study integrates a multifactorial mixed-measure design. Participants are grouped by gender (female vs. male) and working condition (with vs. without exoskeleton). Motor performance and underlying neuronal correlates (fNIRS) will be analyzed. Based on an a priori sample size calculation, 80 participants (40 female/40 male) will be recruited. Working performance will be assessed by 1. Physical Performance Task (PILE task) and 2. Precision Task (following the Fitts paradigm), while body postures will be monitored with an Xsens motion capture system. Brain activation will be captured with an fNIRS system comprising 32 active optodes. Postural comfort/discomfort, acceptance, and usability will be reported via standardized questionnaires. The study will gain insights into potential gender differences in exoskeleton use and will contribute to designing and optimizing the implementation of exoskeletons by considering muscle synergies, movement variability and cognitive resource allocation. Additionally, the study also highlights user discomfort, a crucial factor that could impede widespread adoption, particularly among females, in real-world scenarios.

Impact of caring for patients with polyhandicap on institutional health care workers' quality of life: a cross-sectional and longitudinal evaluation.

Profound intellectual multiple disabilities or polyhandicap (PLH) is defined as a combination of profound mental retardation and serious motor deficits resulting in extreme dependence. Support for these patients is multidisciplinary, complex, and time-consuming. Thus, institutional health care workers (HCWs) face specific working conditions: frequent physical tasks, distressed families, and restricted feedback. We aimed to identify determinants of quality of life (QoL) of HCWs and to study longitudinal evolution. The study used data from the French cohort EVAL-PLH. The participants were institutional HCWs of persons with PLH (age ≥ 3 years at the time of inclusion; age at onset of cerebral lesion <3 years old). Two populations were used: (1) cross sectional study: the sample 1 includes the HCWs assessed at T2 (2020-2021); (2) longitudinal study: the sample 2 includes the HCWs assessed at both T1 (2015-2016) and T2 (2020-2021). The data collected included: sociodemographics, health status, professional variables, and psycho-comportemental aspects. QoL was assessed using WHOQOL-BREF which provides 4 scores. In comparison with French norms, the physical and social scores of QoL were significantly lower while the psychological score was significantly higher for (i) the 223 HCWs (participation rate 62%) assessed at T2 and (ii) the 61 HCWs assessed at T1 and T2. The main factors modulating QoL were age, marital status, self-perceived financial difficulties, personal chronic disease, anxiety-mood disorders, nature of coping strategies, and burnout. This study confirms the mixed (negative and positive) impact of caring persons with PLH on the institutional HCWs' QOL. Main determinants of the HCW's QOL were: older age, single status, perceived financial difficulties, altered health status, burn out and coping strategies.Clinical trial registration number: NCT02400528.

Quantum Computational Complexity and Symmetry

Testing the symmetries of quantum states and channels provides a way to assess their usefulness for different physical, computational, and communication tasks. Here, we establish several complexity-theoretic results that classify the difficulty of symmetry-testing problems involving a unitary representation of a group and a state or a channel that is being tested. In particular, we prove that various such symmetry-testing problems are complete for BQP (bounded-error quantum polynomial time), QMA (quantum Merlin-Arthur), QSZK (quantum statistical zero-knowledge), QIP(2) (two-message quantum interactive proofs), QIP_EB(2) (two-message quantum interactive proofs restricted to entanglement-breaking provers), and QIP (quantum interactive proofs), thus spanning the prominent classes of the quantum interactive proof hierarchy and forging a non-trivial connection between symmetry and quantum computational complexity. Finally, we prove the inclusion of two Hamiltonian symmetry-testing problems in QMA and QAM, while leaving it as an intriguing open question to determine whether these problems are complete for these classes.

Magic of discrete Lattice Gauge theories

Simulation of quantum field theories and fundamental interactions is one of the most challenging tasks in modern particle physics. Classical computers generally fail to reproduce accurate results when it comes to strongly coupled theories such as QCD. Recent developments in quantum technologies open up the possibility of simulating such physical regimes by using quantum computers. In this paper, we study the quantum resource related to the simulability of a quantum theory, i.e. non-stabilizerness for Lattice Gauge Theory (LGT) with discrete symmetry gauge groups. We show that enforcing gauge constraints for [Formula: see text] LGTs has no cost in terms of this resource and discuss the relation between non-abelianity of the gauge group with the average non-stabilizerness of the gauge invariant Hilbert space.

Determining the Need for Palliative Care Patients with Multiple Sclerosis-A Cross-Sectional Study.

Multiple sclerosis is characterised by the manifestation of heterogeneous symptoms that affect daily functioning. Patients face physical impairment, psychological problems and socioeconomic changes. Depending on the form of the disease, they may have different needs, which are often unsatisfied and could be overcome by including palliative care in the treatment. Despite the above, not enough is known about this population's needs for palliative care. This cross-sectional study aimed to identify the need for palliative care and assess the functional dependence level in daily living activities in patients with multiple sclerosis. The sample consisted of 120 patients from the Neurology Clinic of the University Clinical Center of Vojvodina, Serbia. The following research instruments were used: a General questionnaire, Sheffield Profile for Assessment and Referral for Care, Multiple Sclerosis Impact Scale and Barthel Index. The need for palliative care was expressed by 36.7% of patients, who expressed the most concern for the physical symptoms, independence and activity domains. Also, it was determined that the disease prevents patients from doing demanding physical tasks and that they are worried about multiple sclerosis. Almost a quarter of patients have had complete/severe dependence on other persons in performing daily activities. The most frequently reported physical symptoms by patients with MS were weakness, bladder problems, fatigue and different levels of dependence, while concerns related to sexual health, low mood and anxiety emerged as key challenges in the psychological domain. These findings underscore the importance of conducting needs assessments to guide the development of an appropriate palliative care model for MS patients.

Correlation analysis of the urban community environment and health promotion among adults aged ≥ 55 years: the mediating role of physical activity

BackgroundPhysical health (PH), including muscle strength, endurance, and the ability to perform daily physical tasks, gradually declines with increasing age, leading to disability and an increased disease burden. Both the urban community environment (UCE) and physical activity (PA) were linked to PH.MethodsA total of 625 participants aged 55 years and older from Haidian and Chaoyang Districts in Beijing, China, were included in the study from September to December 2023.PH was assessed by a combined score of four tests, including BMI, chronic disease, depression and self-rated health.The Neighborhood Environment Walkability Scale-Abbreviated (NEWS-A), Center for Epidemiological Survey-Depression Scale (CES-D), Physical Activity Scale for Elderly (PASE) and Social Support Rate Score (SSRS) were collected. The analysis was carried out with SPSS v.20 and Amos 24, and the results were validated via structural equation modeling (SEM).ResultsThe urban community environment was positively associated with the health level of older adults. Specifically, the standardized path coefficients indicate that the influence of the built environment (0.72–0.88) was greater than that of the social environment (0.43–0.55) and personal attributes (0.22–0.37) on older adults’ health. Physical activity demonstrated both a mediating effect and an indirect effect, highlighting its significant value as a mediating variable.ConclusionsThe urban community environment has a positive impact on promoting the physical health of older adults, with the influence of the built environment being greater than that of the social environment and personal attributes on their physical health. Physical activity acts as a mediator between the urban community environment and the physical health of older adults.

Local classification of crystalline structures in complex plasmas using a PointNet

Abstract In complex plasmas, microparticles can form ordered crystalline structures under specific conditions. Accurately identifying these structures, such as face-centered cubic, hexagonal close-packed, and body-centered cubic, is a common task in physics. Previous methods rely on detecting symmetries in the spatial arrangement of particles, often requiring extensive calculations. This study presents a novel approach by utilizing a PointNet-based deep learning algorithm, called WignerNet, to classify these structures directly from three-dimensional reconstructions of their Voronoi cells. The model was trained exclusively on artificial and labeled data, incorporating various noise levels, and subsequently tested on real experimental data. The results demonstrate that our method effectively classifies structures, reducing computational complexity and improving accuracy compared to conventional techniques. This advancement opens up new possibilities for real-time analysis of complex plasma systems in various research.

Effect of hyperbaric exposure on cognitive performance: an investigation conducting numerical Stroop tasks during a simulated 440 m sea water saturation diving

BackgroundSaturation diving (SD) is useful and safe in deep diving for long durations. Japan Maritime Self-Defense Force (JMSDF) Undersea Medical Center (UMC) maintained safely deep 45 ATA SDHowever, cognitive performance was reportedly impaired by hyperbaric exposure in over 31 atmosphere absolute (ATA) SD. This study investigated the effects of hyperbaric exposure during 45 ATA deep SD on expert divers’ cognitive function using Stroop tasks, a useful method to examine cognitive function, especially in narrow spaces such as SD chambers.MethodsTwo numerical Stroop tasks were utilized to create two magnitude comparisons of a pair of single-digit numerical and physical tasks. Both numerical Stroop tasks were examined twice, at 1 and 45 ATAs, during a simulated 440 m of sea water depth for SD. Participants were 18 male expert JMSDF SD divers (age 36.58 ± 4.89 years).ResultsIn the numerical task, reaction time (RT) was significantly delayed at 45 ATA compared with 1 ATA in the incongruent condition. In the physical task, RT at 45 ATA was significantly delayed under all the conditions (congruent, incongruent, and neutral). The correct rates (CR) in both numerical Stroop tasks significantly decreased at 45 ATA compared with 1 ATA in the incongruent condition.ConclusionsOur findings suggest that divers’ cognition is impaired during 45 ATA deep SD. These results emphasize the importance of monitoring cognition in deep sea SD and highlight the need to educate and train for SD. Further examination combining Stroop tasks with other analyses such as event-related potential (ERP) is expected.

Physical effort precrastination determines preference in an isometric task.

How the brain decides when to invest effort is a central question in neuroscience. When asked to walk a mile to a destination, would you choose a path with a hill at the beginning or the end? The traditional view of effort suggests we should be indifferent-all joules are equal so long as it does not interfere with accomplishing the goal. Yet, when total joules are equal across movement decisions, the brain's sensitivity to the temporal profile of effort investment remains poorly understood. Here, we sought to parse the interaction of time and physical effort by comparing subjective preferences in an isometric arm-pushing task that varied the duration and timing of high and low effort. Subjects were presented with a series of two-alternative forced choices, where they chose the force profile they would rather complete. Subjects preferred earlier physical effort (i.e., to precrastinate) but were idiosyncratic about preference for task timing. A model of subjective utility that includes physical effort costs, task costs, and independent temporal sensitivity factors described subject preferences best. Interestingly, deliberation time and response vigor covary with the same subjective utility model for preference, suggesting a utility that underlies both decision making and motor control. These results suggest physical effort costs are temporally sensitive, with earlier investment of effort preferred to later investment, and that the representation of effort is based on not only the total energy required but also when it is required to invest that energy.NEW & NOTEWORTHY We use a novel paradigm that differentiates physical effort costs, task costs, and time, where subjects choose between isometric arm-pushing tasks. Subjects prefer high physical effort earlier than later. They also decide faster and respond more vigorously the greater their preference. We find a generalizable subjective utility model that includes independent time-sensitivity of physical effort and task costs. Together, we demonstrate that subjective effort includes not only the total effort invested but also its timing.

Anthropometrical and Physical Performance Profiles of Military Cadets from Angola

Military efforts must include different evaluations to prepare for battles around the world. This study aimed to characterize the body composition and physical performance levels of military cadets from Angola. Ninety military academy participants (males: n=48, females: n=42) aged 18-24 years old performed a battery of physical fitness tests to evaluate upper and lower limbs muscle strength, cardiorespiratory fitness, and body composition. Significant differences between sexes were observed in all variables (p&lt;0.05). Males and females, respectively, showed normal-range values in the body mass index (BMI) (23.32±3.95; 24.75±4.01 Kg/m2), body fat (9.09±6.17; 14.59±8.86 kg), push-ups (36.88±9.81; 20.67±6.62 repetitions), sit-ups (71.04±17.14; 61.95±19.05 repetitions) and medicine ball throwing (5.06±0.89; 4.00±0.84 m). However, countermovement jump (36.14±6.54; 23.53±7.62 cm), 80-meter sprint (13.08±1.90; 14.96±2.01 s), cardiorespiratory fitness (maximal oxygen uptake: 38.02±6.3; 33.18±6.49 ml/kg/min), and fat-free mass values (54.17 ± 8.06; 46.18 ± 6.9 kg) were considered low, specifically in females. Military cadets from Angola, especially females, presented low values of fat-free mass, cardiorespiratory fitness, and neuromuscular maximal performances (countermovement jump and sprint). This highlights a need for body composition and physical condition improvement to perform physical tasks with high military relevance.

Tangled Physics: Knots Strain Intuitive Physical Reasoning.

Whereas decades of research have cataloged striking errors in physical reasoning, a resurgence of interest in intuitive physics has revealed humans' remarkable ability to successfully predict the unfolding of physical scenes. A leading interpretation intended to resolve these opposing results is that physical reasoning recruits a general-purpose mechanism that reliably models physical scenarios (explaining recent successes), but overly contrived tasks or impoverished and ecologically invalid stimuli can produce poor performance (accounting for earlier failures). But might there be tasks that persistently strain physical understanding, even in naturalistic contexts? Here, we explore this question by introducing a new intuitive physics task: evaluating the strength of knots and tangles. Knots are ubiquitous across cultures and time-periods, and evaluating them correctly often spells the difference between safety and peril. Despite this, 5 experiments show that observers fail to discern even very large differences in strength between knots. In a series of two-alternative forced-choice tasks, observers viewed a variety of simple "bends" (knots joining two pieces of thread) and decided which would require more force to undo. Though the strength of these knots is well-documented, observers' judgments completely failed to reflect these distinctions, across naturalistic photographs (E1), idealized renderings (E2), dynamic videos (E3), and even when accompanied by schematic diagrams of the knots' structures (E4). Moreover, these failures persisted despite accurate identification of the topological differences between the knots (E5); in other words, even when observers correctly perceived the underlying structure of the knot, they failed to correctly judge its strength. These results expose a blindspot in physical reasoning, placing new constraints on general-purpose theories of scene understanding.

Decision cost hypersensitivity underlies Huntington's disease apathy.

The neuropsychiatric syndrome of apathy is now recognized to be a common and disabling condition in Huntington's disease (HD). However, the mechanisms underlying it are poorly understood. One way to investigate apathy is to utilise a theoretical framework of normal motivated behaviour, to determine where breakdown has occurred in people with this behavioural disruption. A fundamental computation underlying motivated, goal-directed behaviour across species is weighing up the costs and rewards associated with actions. Here, we asked whether people with apathy are more sensitive to costs of actions (physical effort and time delay), less sensitive to rewarding outcomes, or both. Based on the unique anatomical substrates associated with HD pathology, we hypothesised that a general hypersensitivity to costs would underpin HD apathy. Genetically confirmed carriers of the expanded Huntingtin gene (premanifest to mild motor manifest disease (n=53) were compared to healthy controls (n = 38). Participants performed a physical effort-based decision-making task (Apple Gathering Task) and a delay discounting task (Money Choice Questionnaire). Choice data was analysed using linear regression and drift diffusion models that also accounted for the time taken to make decisions. Apathetic people with HD accepted fewer offers overall on the Apple Gathering Task, specifically driven by increased sensitivity to physical effort costs, and not explained by motor severity, mood, cognition, or medication. Drift diffusion modelling provided further evidence of effort hypersensitivity, with apathy associated with a faster drift rate towards rejecting offers as a function of varying effort. Increased delay sensitivity was also associated with apathy, both when analysing raw choice and also drift rate, where there was moderate evidence of HD apathy drifting faster towards the immediately available (low cost) option. Furthermore, the effort and delay sensitivity parameters from these tasks were positively correlated. The results demonstrate a clear mechanism for apathy in HD, cost hypersensitivity, which manifests in both the effort and time costs associated with actions towards rewarding goals. This suggests that HD pathology may cause a domain-general disruption of cost processing, which is distinct to apathy occurrence in other brain disorders, and may require different therapeutic approaches.

The effect of a physically formidable competitor or cooperator on attraction to violent video games

Typically, men prefer violent video games more than women do. However, little is known about the motivational factors driving this greater preference for violent games in men. The integrative motivational model of violent video games (IMT-VVG) suggests that the pull of violent video games should be strongest in men because men have faced stronger evolutionary pressures to physically compete within an explicit hierarchy relative to women. In two experiments, individuals were led to believe they were competing (Experiment 1; N = 122) or cooperating (Experiment 2; N = 121) with an ostensible same-gender partner to complete a physical strength program. The partner was presented as either high or low in physical formidability. Participants then selected a violent or non-violent video game to play for up to 15 min. In Experiment 1, men showed a stronger preference for violent video games than women when they anticipated facing a stronger opponent in an impending physical strength competition. In Experiment 2, for the physical cooperation task, men also chose the violent game over the non-violent game, but did so independent of the formidability of their cooperation partner. In sum, these data suggest that men may be attracted to violent video games when faced with a competitive task that requires physical strength, but not necessarily a cooperative task. In support of this hypothesis, participants who played the violent games reported greater subjective toughness after game play. These results provide evidence for a new integrative motivational theory of violent video game play.

4 DEGREE OF FREEDOM ARM ROBOTICS TRAINING FOR STATE VOCATIONAL HIGH SCHOOL 1 DEPOK

This activity provides knowledge about the basics and latest applications in the field of Robotics, especially industrial robots and teaches students to be able to assemble robots. 4 Degree of Freedom Arm Robot is a set of mechanical and electronic tools (mechatronics) that can carry out physical tasks, with 4 degrees of freedom of arm movement robots, namely 1 forward-backward, 2 left-right, 3 up-down. Then there are also three movements at the wrist, namely 4 yaw, 5 pitch and 6 roll. The robot arms have functions to move objects with control using a joystick. With the hope that it can make human work easier in moving objects. To be able to provide students with an understanding of robotics, qualified teachers are needed who have mastered the field of electrical engineering, especially robotics. From the comparison of test results before and after participating in activities by students, a significant increase in knowledge was obtained. Apart from that, students also succeeded in assembling a robot using the materials and components provided.

How do social interaction and group-level regulation shape task perceptions in collaborative learning task?

ABSTRACT This study explored patterns of social interaction and group-level regulation in terms of co- and socially shared regulation in collaborative learning and their relation to learners’ metacognitive task perceptions. 72 secondary school students performed collaborative physics tasks in small groups over multiple 90-minute sessions. Video recordings (∼148.5 h) of collaborative interactions and pre- and post- situated self-reports of learners’ task perceptions were collected. The collaborative sessions were clustered and collaborative interaction patterns were examined. Finally, learners’ task perceptions in the clusters were investigated. The results showed different collaborative interaction patterns and differences in learners’ task perceptions between the clusters. The main finding is that continuous active participation in socioemotional interactions alongside cognitive-focused interactions and appropriate group-level regulation of learning positively influence learners’ perceived task understanding. These findings add to current understanding of collaborative interactions as temporal processes and contribute to practical implications for supporting collaborative interactions to enhance metacognitive skills.

Examining presenteeism and productivity losses among nursing workers: a cross-sectional study.

To characterize presenteeism and productivity losses among nursing professionals in public and private health services. A cross-sectional study was conducted with 123 participants from a public hospital and 159 from a private hospital in Manaus, Brazil. The Sociodemographic Health Questionnaire was utilized to assess presenteeism, while the Work Limitations Questionnaire measured productivity losses. Data were analyzed using non-parametric methods. Health-related work loss and presenteeism were reported by 50.41% of public sector professionals and 39.62% of private sector professionals. Despite this, presenteeism was more prevalent in the private sector (93.65%) compared to the public sector. Common health issues included musculoskeletal (26.49%), mental/behavioral (19.21%), respiratory (17.22%), neurological (16.56%), and gastrointestinal (5.96%) conditions. Additionally, 54.24% of private sector professionals and 44.23% of public sector professionals did not seek treatment. The private sector exhibited greater limitations in receiving care due to time management (40.34%), mental-interpersonal tasks (49.95%), production tasks (52.54%), and physical tasks (61.30%), resulting in higher productivity losses among nurses (13.46%) and nursing technicians (15.82%). High-complexity sectors demonstrated the greatest productivity losses. The study identified significant differences in the characteristics of presenteeism and productivity losses between nursing professionals in the public and private health sectors. These results point to the need to improve management and occupational safety and regulatory measures to solve workers' health problems and mitigate presenteeism and productivity losses in the public and private health sectors.