The continuous nature of timing reprogramming in an interceptive task

The time course of movement timing reprogramming was examined in a task requiring temporal coincidence of the conclusion of a forehand drive with the arrival of a moving luminous target at the end of an electronic trackway. The moving target departed from one end of the trackway at a constant velocity of 2?m ^. s^?1, and for a part of the trials its velocity was increased to 3?m ^. s^?1. Target velocity was modified at different moments during stimulus displacement, producing times-to-arrival after velocity increment (TAVIs) from 100 to 600?ms. The effect of specific practice on movement reprogramming was also examined. The results showed early adjustments to the action (TAVIs = 100?–?200?ms) that seemed to be stereotyped, while feedback-based corrections were implemented only at TAVIs of 300?ms or longer. Temporal accuracy was progressively increased as longer TAVIs were provided up to 600?ms. Skill training led to an overall increment of temporal accuracy, but no effect of specific practice was found. The results indicate that timing reprogramming in interceptive actions is a continuous process limited mainly by intrinsic factors: latency to initiate more effective adjustments to the action, and rate-of-movement timing reprogramming.     

Motor variability in sports: A non-linear analysis of race walking

Abstract

This aim of this study was to analyse the nature of movement variability and to assess whether entropy measures may represent a valuable synthetic index of neuromuscular organization. The regularity of kinematic/kinetic time series during race walking, the changes in the structure of intra-individual variability over the test session, and the influence of athletic skill in (inter)national rank athletes were investigated. Motion analysis techniques were used. Sample entropy (SampEn) was adopted to examine fluctuations in lower limb angles and ground reaction forces. The regularity of both original and surrogate time series was assessed and compared, by estimating SampEn, to verify the presence of non-linear features in movement variability. SampEn was statistically lower in the original data than in surrogates. In contrast, the regularity of time series did not change significantly throughout the subsequent intra-individual repetitions. Hip and ankle joint angles and vertical ground reaction force manifested increased entropy for skilled athletes. Results suggest that race walking variability was not only the product of random noise but also contained information about the inherent propriety of the neuro-musculo-skeletal system. Furthermore, they provide some indications about neuromuscular control of the lower limb joints during race walking gait, and about the differences between more and less skilled individuals.     

Consistency of toddler engagement across two settings

This study documented the consistency of child engagement across two settings, toddler child care classrooms and mother–child dyadic play. One hundred twelve children, aged 14–36 months (M = 25.17, SD = 6.06), randomly selected from 30 toddler child care classrooms from the district of Porto, Portugal, participated. Levels of engagement were coded, and sophisticated engagement, but not nonengagement, was consistent across settings. Consistency in children's sophisticated engagement was primarily accounted for by chronological age. Children spent more time in sophisticated behaviors and less time nonengaged during mother–child dyadic play than in center-based child care. For sophisticated engagement, effects of child predictors were stronger than effects of environmental features; whereas for nonengagement, effects of environmental features were stronger than effects of child predictors. Findings suggest children's sophisticated engagement may be generalizable across settings, as a function of age, whereas their nonengagement is most likely context dependent.     

Spanish Secondary-School Science Teachers’ Beliefs About Science-Technology-Society (STS) Issues

This study analyzes the beliefs about science-technology-society, and other Nature of Science (NOS) themes, of a large sample (613) of Spanish pre- and in-service secondary education teachers through their responses to 30 items of the Questionnaire of Opinions on Science, Technology and Society. The data were processed by means of a multiple response model to generate the belief indices used as the bases for subsequent quantitative and qualitative analyses. Other studies have reported a negative profile of teachers’ understanding in this area, but the diagnosis emerging from the present work is more complex. There was a mix of appropriate beliefs coexisting with others that are inappropriate on the topics analyzed. The overall assessment, however, is negative since clearly teachers need to have a better understanding of these questions. There were scant differences between the pre- and in-service teachers, and hence no decisive evidence that the practice of teaching contributes to improving the in-service teachers’ understanding. These results suggest there is an urgent need to bring the initial and continuing education of science teachers up to date to improve their understanding of these topics of science curricula, and thus improve the teaching of science.     

Commerce and the Hungarian Educational System

Abstract

Klàra Tompa describes how teaching aids used to be provided in Hungary, and how that system is now changing, with commerce and the Ministry of Education working together with the aim of ensuring that provision of teaching aids is most effective for the teachers and the classes.     

La eliminación de conductas autolesivas en niños retrasados profundos

RESUMEN

Se han empleado muchos procedimientos para la supresión de conductas autolesivas, pero en pocos casos se ha tenido en cuenta dotar al sujeto de un comportamiento más adaptativo. La hipótesis que se propone es que el castigo de las conductas autolesivas no provocará un aumento de los comportamientos adaptados si éstos no forman ya parte del repertorio conductual del niño. Para corroborar esta hipótesis se realiza un estudio en dos fases con niños deficientes profundos con conductas autolesivas utilizando castigo social. Los resultados muestran que la operación de castigo contingente es efectiva en la eliminación de conductas autolesivas, que este tipo de conductas son mantenidas por el medio ambiente y la necesidad de enseñar y reforzar positivamente conductas más adaptadas.     

Enhancing the Attitudes and Self-Efficacy of Older Adults Toward Computers and the Internet: Results of a Pilot Study

This pilot study explored whether a manualized training program could enhance older adults' computer self-efficacy and attitudes toward computers and the Internet. A total of 32 community-dwelling adults 65 years of age or older were randomly assigned to either an experimental or control group, with each group consisting of 8 women and 8 men. The experimental group received 6 weeks of training with two-hour one-on-one sessions once per week. The same training was administered to the control group upon completion of the posttest, 6 weeks after the baseline assessment, to match the procedures on all counts with the exception of training administration. The results of two ANOVAs indicated that participants within the experimental group improved significantly on both their computer self-efficacy (p < .001) and attitudinal scores (p < .001) at the posttraining assessment. No improvements were found in the control group.     

Pilot Testing a New Short Screen for the Assessment of Older Women's PTSD Symptomatology

It is difficult for busy health care providers to perform routine screening for older women's posttraumatic stress symptomatology. This difficulty is due, at least partially, to a paucity of instruments specifically tested on such a population. To address this issue, in this preliminary study we tested an abbreviated screen from the set of 20 items comprising the Distressing Event Questionnaire (DEQ; Kubany, Leisen, Kaplan, & Kelly, 2000a Kubany , S. E. , Leisen , M. B. , Kaplan , A. S. , & Kelly , M. P. ( 2000a ). Validation of a brief measure of PTSD: The Distressing Event Questionnaire . Psychological Assessment , 12 ( 2 ), 197 – 209 .[Crossref], [PubMed], [Web of Science ®] , [Google Scholar]) on a convenience sample of 94 ethnically diverse older women (age 52–105). This new five-item derivation, named Brief Posttraumatic Stress Screening Scale (BPSSS), assesses posttraumatic stress based on the Diagnostic and Statistical Manual of Mental Disorders (DSM–IV; American Psychiatric Association, 1994 American Psychiatric Association . ( 1994 ). Diagnostic and statistical manual of mental disorders , (4th ed.) . Washington , DC : American Psychiatric Press . [Google Scholar]). Its conciseness reduces the likelihood that older women would become fatigued during assessment, making it ideal for use in busy health care settings. In view of the hypothesized cohesiveness of the tool's five items, we expected the screen to be reliable. Because the BPSSS has only five items, a single factor was hypothesized to account for a large proportion of the variance in its items. We also expected that scores on the screen would correlate (to a certain extent) with those on measures of depression and perceived stress of a nontraumatic and nonmedical nature. A standardized alpha of .86 demonstrated high internal consistency of the BPSSS, and the exploratory factor analysis showed that one factor accounted for 58% of the five items' variance. Moreover, the correlations of BPSSS scores with scores on nontraumatic stress and depression were moderate yet significant (r = .37, p < .01 and r = .50, p < .01, respectively).     

Performance equivalency between computer‐based and traditional pen‐and‐paper assessment: A case study in clinical anatomy

The time, material, and staff‐consuming nature of anatomy's traditional pen‐and‐paper assessment system, the increase in the number of students enrolling in medical schools and the ever‐escalating workload of academic staff have made the use of computer‐based assessment (CBA) an attractive proposition. To understand the impact of such shift in the assessment method, an experimental study evaluating its effect on students’ performance was designed. Additionally, students’ opinions toward CBA were gathered. Second‐year medical students attending a Clinical Anatomy course were randomized by clusters in two groups. The pen‐and‐paper group attended two sessions, each consisting of a traditional sectional anatomy steeplechase followed by a theoretical examination, while the computer group was involved in two similar sessions conducted in a computerized environment. At the end of each of the computer sessions, students in this group filled an anonymous questionnaire. In the first session, pen‐and‐paper group students scored significantly better than computer‐group students in both the steeplechase (mean ± standard deviation: 66.00 ± 14.15% vs. 43.50 ± 19.10%; P < 0.001) and the theoretical examination (52.50 ± 12.70% vs. 39.00 ± 21.10%; P < 0.001). In the second session, no statistically significant differences were found for both the steeplechase (59.50 ± 17.30% vs. 54.50 ± 17.00%; P = 0.085) and the theoretical examination (57.50 ± 13.70% vs. 54.00 ± 14.30%; P = 0.161). Besides, an intersession improvement in students’ perceptions toward CBA was registered. These results suggest that, after a familiarization period, CBA might be a performance equivalent and student accepted alternative to clinical anatomy pen‐and‐paper theoretical and practical examinations. Anat Sci Educ 11: 124–136. © 2017 American Association of Anatomists.     

Assessing and Controlling Acquiescent Responding When Acquiescence and Content Are Related: A Comprehensive Factor-Analytic Approach

This article proposes procedures for assessing and controlling acquiescence in personality scales when acquiescence is related to the content that the scale intends to measure. Our proposal is comprehensive in that it can be applied to different item response formats fitted with response models that can be parameterized as factor-analytic models. In the calibration stage, our proposal makes joint use of a balanced scale and a set of markers for acquiescence, and consists of 2 sequential procedures: a direct semirestricted solution, and a restricted solution with minimal identification constraints. In the scoring stage, we discuss how the information given by the acquiescence–content relation can be used to obtain Bayes expected a posteriori scores. The robustness of the direct procedure is assessed both analytically and by simulation. A free, user-friendly program that implements the procedures proposed is made available. Practical issues of use and interpretation are discussed and illustrated with an empirical application.