Long-term effects of acoustic reafference training (ART)

In sport visual feedback is often used to enhance performance, mostly neglecting the auditory modality. However, athletes produce natural sounds when they move (acoustic reafferences) which they perceive and use to control their movements. We examined the short- and long-term effects of a training intervention on a complex movement by using acoustic reafferences. Natural step sounds produced during hurdling were recorded and played back to the participants immediately before each trial, with an increase (fast group), decrease (slow group), or no manipulation (control group) in the tempo. All groups increased their hurdling performance regarding overall running time, with the slow group showing the best performance development. After a 10-week retention, the fast and slow group further increased performance, whereas the control group declined. The repeated experience with acoustic information associated with the rhythmic pattern of hurdling may have helped developing a cognitive representation of that movement, especially regarding long-term effects.     

Mapping undergraduate chemistry students' epistemic ideas about models and modeling

Developing and using scientific models is an important scientific practice for science students. Undergraduate chemistry curricula are often centered on established disciplinary models, and assessments typically provide students with opportunities to use these models to predict and explain chemical phenomena. However, traditional curricula generally provide few opportunities for students to consider the epistemic nature of models and the process of modeling. To gain a sense of how introductory chemistry students understand model changeability, model multiplicity, the evaluation of models, and the process of modeling, we use a construct-mapping approach to characterize the sophistication of students' epistemic knowledge of models and modeling. We present a set of four related construct maps that we developed based on the work of other scholars and empirically validated in an undergraduate introductory chemistry setting. We use the construct maps to identify themes in students' responses to an open-ended survey instrument, the models in chemistry survey, and discuss the implications for teaching.     

Beyond “what works”: A mixed-methods study of intervention effect modifiers in the Good Behavior Game

This mixed-methods study examines two moderators of the impact of the Good Behavior Game—implementation variability, participant risk status, and the interaction between them—as predictors of behavioral and academic outcomes. Quantitative data from 38 primary schools were utilized, with outcome data collected at baseline and 2-year follow-up. Behavior (disruptive behavior, prosocial behavior, and concentration problems) was assessed via the Teacher Observation of Classroom Adaptation Checklist. Reading attainment was assessed via national teacher assessment scores, and the Hodder Group Reading Test. Implementation fidelity/quality data were collected via independent observations. Participant risk status was modeled using a cumulative risk index. Multilevel modeling revealed that higher levels of fidelity/quality were associated with improved overall reading scores (d = 0.203–225), but worsening disruptive behavior among high-risk students (d = 0.560). Thematic analysis of qualitative interview data collected from 20 teachers identified six groups of at-risk students who were perceived to experience differential effects, and five key mechanisms underpinning these.     

Detection of diagenetic alterations by Spectroscopic Analysis on Archaeological Bones from the Necropolis of Poseidonia (Paestum): A case study

Understanding the chemical and physical alteration in archaeological bones, occurred after burial, is very interesting for researchers. In this paper, we present a study on the diagenetic alteration of human archaeological bony tissues from Paestum (South Italy), by combining complementary spectroscopic techniques, such as solid-state nuclear magnetic resonance (NMR), infrared spectroscopy (IR), and X-ray diffraction. In particular, ¹³C nuclear magnetic resonance–cross polarization-magic angle spinning (¹³C NMR CP-MAS) spectroscopy allows to identify and discriminate the adsorbed calcite, that is a diagenetic contaminant, from the structural one of apatite and ¹H NMR-MAS spectroscopy shows how the degradation of organic phase of collagen is related to the time. The NMR data are combined with crystalline index, measured by X-ray diffraction, and with the splitting factor obtained by infrared spectroscopy. Moreover, the evaluation of the relative content of biogenic structural carbonate and of diagenetic fluorine is reported.     

Planning the Future in an Uncertain Present: Postsecondary Possibilities for Accompanied Youth of Color Experiencing Homelessness

The Urban Review - Research suggests diverse experiences with homelessness can affect students’ PK-12 school success and, relatedly, postsecondary opportunities. Exploring postsecondary...     

The effect of acute caffeine ingestion on upper body anaerobic exercise and cognitive performance

Abstract

The current study examined the effect of acute caffeine ingestion on mean and peak power production during upper body Wingate test (WANT) performance, rating of perceived exertion, readiness to invest effort and cognitive performance. Using a double-blind design, 12 males undertook upper body WANTs, following ingestion of caffeine (5?mg*kg^?1) or placebo. Pre-substance ingestion, 60?mins post substance ingestion and post exercise participants completed measures of readiness to invest physical and mental effort and cognitive performance. Peak power was significantly higher (P?=?.026), fatigue index greater (P?=?.02) and rating of perceived exertion lower (P?=?.025) in the presence of caffeine. Readiness to invest physical effort was also higher (P?=?.016) in the caffeine condition irrespective of time point (pre, 60?mins post ingestion and post exercise). Response accuracy for incongruent trials on the Flanker task was superior in the presence of caffeine (P?=?.006). There was a significant substance?×?time interaction for response speed in both congruent and incongruent conditions (both P?=?.001) whereby response speeds were faster at 60?mins post ingestion and post exercise in the caffeine condition, compared to placebo. This is the first study to examine the effects of caffeine ingestion on this modality of exercise and suggests that caffeine ingestion significantly enhances peak power, readiness to invest physical effort, and cognitive performance during WANT performance.     

Effects of Classroom Seating Arrangements on Children's question-asking

This study investigated the relationship between classroom seating arrangements and the question-asking of fourth-graders. Data were collected during 53 lessons spread over 8 weeks. Children were assigned to sit in a semicircle and then in a row-and-column seating arrangement for 2 weeks each. This rotation was repeated. Both children's questions and the teacher's verbal reactions were recorded using an observational system based on Kearsley's question taxonomy. The results showed that children asked more questions in the semicircle than in the row-and-column arrangement, and that the pattern of question characteristics was stable over time. The findings also revealed that, within the row-and-column arrangement, there was an action-zone in which children asked more questions per lesson. The results are interpreted in terms of Steinzor's postulation that social interaction is encouraged when individuals are able to establish face-to-face contact. This revised version was published online in July 2006 with corrections to the Cover Date.     

‘It was precious to me from the beginning’: material objects,long-distance fandom and home

Material objects and football fandom are intimately linked. As a repository of emotion, memorabilia holds value as a marker of identity. For many football fans, the conception of ‘home’ is integral to their identity. Despite its centrality to football fans’ construction of identity, the notion of ‘home’ has received little attention from sports scholars. Drawing on recent work in cultural geography, this paper employs concepts of home to explore the ways in which materiality holds identity for football fans. Evidence from New Zealand-based fans of European teams displays how material objects are able to collapse distance between fans and their club, acting as palimpsests for memory and narratives for significant emotional experiences. Embedded in the New Zealand home of the fan, memorabilia resides as an emotional bridge to their football home locality, stadia and supporters.