Proactive interference of open field on consummatory successive negative contrast

Reactivity to a reward is affected by prior experience with the different reinforcer values of that reward, a phenomenon known as incentive relativity, which can be studied using the consummatory succesive negative contrast (cSNC) paradigm, in which the performance of animals that receive a 4 % sucrose solution after trials on which they were exposed to 32 % sucrose is compared with that of subjects that always receive the 4 % sucrose solution. The exploration of a novel open field can enhance or block the acquisition of associative and nonassociative memories. The effect of open field on cSNC has not yet been explored. The main result of the present study was that open-field exposure significantly modified the expression of cSNC. Exposure to an open field 1 h but not immediately before the downshift interfered with the expression of cSNC. These animals drank more of the downshifted reward than did controls that were not exposed to the apparatus, and this behavior persisted for up to three recovery trials. This phenomenon was observed even when the animals were given a more protracted preshift phase and when the discrepancy between the preshift and shift incentive values of sucrose were increased. An open field also interfered with incentive downshift when open-field exposure occurred 6 h before the downshift, and repeated exposure to the apparatus did not deteriorate this effect. The present study adds to a growing body of literature that indicates that open-field exploration can interfere with memory formation.     

Emergent literacy and learning to write: A predictive model for italian language

The aim of the present study is twofold: (1) contribute to identifying a model for the variables that compose the emergent literacy construct and their relationships; (2) assess the predictive power of the emergent literacy model on early writing abilities in a transparent orthography language. We examined emergent literacy skills in 464 children (mean age 5.5, range: 48–6.1) who were followed longitudinally until entering the 1st grade in primary school. Exploratory and Confirmatory factor analyses were used to address questions on the nature of emergent literacy skills and their possible relationships. Regression analyses were implemented to evaluate the predictive capability of an emergent literacy model on word writing competences. The factor analyses showed three factorial dimensions (phonological, conceptual knowledge on writing system and textual) and their relationship. The regressions showed a significant prediction of conceptual knowledge on writing system and of phonological abilities on early writing abilities.     

Alternative assessment of knee joint muscle balance of soccer players through total work-based hamstring: quadriceps ratios

Isokinetic hamstring-to-quadriceps (H:Q) ratios are frequently used to assess knee muscle strength imbalances and risk of injuries/re-injuries. The use of peak torque (PT) or total work (TW) to estimate joint stability may lead to different results because of the differences between these two neuromuscular variables. Thus, the current study aimed to compare the conventional and functional H:Q ratios calculated by PT and TW. Ninety-three male professional soccer players from Brazilian first division teams performed isokinetic concentric and eccentric contractions of the quadriceps and the hamstrings at 60°/s. Muscle strength balance was calculated using the conventional torque ratio (CTR) and conventional work ratio (CWR), functional torque ratio (FTR) and functional work ratio (FWR) were highly and moderately correlated between them (r?=?0.83 and r?=?0.73, respectively). The Wilcoxon statistical test revealed significant differences between CTR and CWR, as well as FTR and FWR (p?T-test demonstrated significant differences in mean CTR–CWR and FTR–FWR, whereas Bland–Altman plots showed non-consistent bias. In addition, the chi-square test demonstrated significant differences between players below the conventional reference values and functional reference values (p?相似文献   

Effects of inspiratory muscle training in professional women football players: a randomized sham-controlled trial

This study was conducted to determine the effects of inspiratory muscle training (IMT) on respiratory and peripheral muscles oxygenation during a maximal exercise tolerance test and on repeated-sprint ability (RSA) performance in professional women football players. Eighteen athletes were randomly assigned to one of the following groups: SHAM (n = 8) or IMT (n = 10). After a maximal incremental exercise test, all participants performed (on a different day) a time-to-exhaustion (Tlim) test. Peripheral and respiratory muscles oxygenation by near-infrared spectroscopy, breath-by-breath ventilatory and metabolic variables, and blood lactate concentration were measured. The RSA test was performed on a grass field. After a 6 week intervention, all athletes were reevaluated. Both groups showed increases in inspiratory muscles strength, exercise tolerance and RSA performance, however only the IMT group presented lower deoxyhemoglobin and total hemoglobin blood concentrations on intercostal muscles concomitantly to an increased oxyhemoglobin and total hemoglobin blood concentrations on vastus lateralis muscle during Tlim. In conclusion, these results may indicate the potential role of IMT to attenuate inspiratory muscles metaboreflex and consequently improve oxygen and blood supply to limb muscles during high-intensity exercise, with a potential impact on inspiratory muscle strength, exercise tolerance and sprints performance in professional women football players.     

The Physics Laboratory – A Historical Overview and Future Perspectives

In the framework of teaching the natural sciences, ``laboratory' is a general name for activities based on observations, tests, and experiments done by students. It is hard to imagine learning to do science, or learning about science, without doing laboratory or fieldwork. In this paper, a historical overview of the place, purposes, and goals of the laboratory in physics teaching is presented, together with perspectives for its future related to the most recent results of research in physics education, mainly those concerning the constructivist and social constructivist learning approaches. Based on these approaches we try to validate the belief that microcomputer-based laboratories (MBLs) are one of the most promising perspectives in physics laboratory teaching, based on both theoretical and empirical grounds.     

Impact of a computer-based intervention in Chilean children at risk of manifesting reading difficulties / Impacto de una intervención basada en ordenador en niños chilenos con riesgo de manifestar dificultades lectoras

Reading difficulties have reached a prevalence of 3–10% in school-age children. Those who present these difficulties avoid reading and benefit very little from school-based learning opportunities, resulting in maladjustments, dropping out of school and having to repeat grades. Presented here are the results of an intervention based on a computer game intended for explicit phonic training in first-grade school children at risk of possessing reading difficulties. Fifty-six children from a low socioeconomic status (SES) and 31 children from a high socioeconomic status, divided into two groups (control and experimental), participated in the study. After the intervention, participants from the low-SES experimental group had enhanced their skills regarding letter sound recognition, whereas the high-SES experimental group had improved their naming speed. The results are discussed in light of the impact of interventions based on computer games and of the importance of the development of sublexical skills in children at risk of manifesting reading difficulties in transparent orthographies.     

Accounting for Rater Effects With the Hierarchical Rater Model Framework When Scoring Simple Structured Constructed Response Tests

Many large‐scale assessments are designed to yield two or more scores for an individual by administering multiple sections measuring different but related skills. Multidimensional tests, or more specifically, simple structured tests, such as these rely on multiple multiple‐choice and/or constructed responses sections of items to generate multiple scores. In the current article, we propose an extension of the hierarchical rater model (HRM) to be applied with simple structured tests with constructed response items. In addition to modeling the appropriate trait structure, the multidimensional HRM (M‐HRM) presented here also accounts for rater severity bias and rater variability or inconsistency. We introduce the model formulation, test parameter recovery with a focus on latent traits, and compare the M‐HRM to other scoring approaches (unidimensional HRMs and a traditional multidimensional item response theory model) using simulated and empirical data. Results show more precise scores under the M‐HRM, with a major improvement in scores when incorporating rater effects versus ignoring them in the traditional multidimensional item response theory model.     

Where is my attention? Children’s metaknowledge expressed through drawings

The aim of the present research is to assess the developmental pattern of the metacognitive knowledge of attention in Italian primary school students. Data were collected from 95 pupils divided into two age groups: the first (6–8 years) and second primary school cycles (8–10 years). The children were asked to perform two specific thematic drawings on attention vs inattention in the school context. The drawings were coded on the basis of the Children’s Awareness of Attention through Drawing, consisting of five scales which explore the behavioural, pragmatic, cognitive, emotional and social awareness of attention. The analysis of the thematic drawings reveals that from the early years of primary school, children are aware of some components of attention: behavioural awareness, pragmatic awareness and social awareness. Other components are instead acquired as of the age of eight.     

The state and higher education in Colombia

The development of higher education in Colombia is discussed in terms of its recent quantitative expansion and the accompanying qualitative differentiation. Beginning in 1980 with the University Reform of that year, the state sought to give shape to the system by policies intended (i) to improve its organization (ii) to expand it on more democratic lines and (iii) to improve its quality. The authors discuss the developments which marked attempts to implement these aims. Two critical policy areas emerged—the funding of the system and the administration of the public sector part of it. Current debates are analysed and the authors provide pointers to possible future developments including the development of a highly stratified system with little interaction between the top and the bottom.