1,720,954 research outputs found
Amplification of error:A learning strategy to improve motor skills
No full textThe aim of this study is to test the efficacy of an alternative teaching strategy called Method of Amplification of Error (MAE) and to compare the relative effectiveness of MAE to the traditional direct instruction method (DI) and to a no-feedback control condition (C). MAE assumes that amplifying the subject’s “main” error in a given motor skill would allow him to better understand what is not-to-be-done, thereby correcting motor errors. Nine Regional and National weightlifters participated in the present study. The comparative study included 3 groups: DI feedback, MAE feedback and Control (C), without feedback. At the testing session each athlete performed 12 trials: 3 trials pre- training (T0), 6 trials feedback training and 3 trials post- training (T1). Each athlete performed the trials at 80% of the maximum weight lifted in the last competition with snatch technique. Kinematic and kinetic analyses were performed with a VICON system and two force plates. Mean values, standard deviation and percentage variations of the barbell’s maximum vertical velocity, the peak power, the horizontal and vertical displacement were used for the performance analysis. Results showed that the post-instruction performance in MAE group present a better performance than DI and C group in all variables considerate. As such, the reported results are consistent with the findings of other studies showing that MAE strategies can facilitate motor learning, as it seems to be addressed from an open, individualized perspective to help lifters build an efficient individual technical pattern
The effects of amplification of error: a teaching strategy to improve motor pattern in weightlifting.
No full textAim: The aim of this study was to test the efficacy of an alternative teaching strategy called Method of Amplification of Error (MAE) and to compare the relative effectiveness of MAE to the traditional direct instruction method (DI) and to a no-feedback control (C). Developing methods aimed at improving motor skills in sports is a key factor in movement science. MAE assumes that amplifying the subject’s “main” error in a given motor skill would allow him to better understand what is not-to-be-done, thereby correcting motor errors (1). MAE employs movement as feedback and the feedback is maintained in the motor-perceptive language used by the subject’s own body.Method: 12 Regional and National weightlifters were assigned to one of 3 groups: DI feedback, MAE feedback and Control (C), without feedback. At the testing session each athlete performed 12 trials: 3 trials pre- training (T0), 6 trials feedback training and 3 trials post- training (T1). After a week the athletes performed retention test (T2). Each athlete performed the trials at 80% of the maximum weight lifted in the last competition with snatch technique. The feedback focused on the “main” error diagnosed as the incorrect position of the participant’s centre of mass projection during the first pull phase. Kinematic outcomes were recorded with a motion analysis system (VICON 1.5.1, 8 cameras, 250Hz), a dedicated software (VICON Workstation 5.2) was also used for digitalization and reconstruction of the marker positions. Nonparametric statistical analysis was performed using SPSS version 16.; the Mann-Whitney test was conducted to assess significant differences between groups at three levels: T0, T1 and T2. Statistical significance was set at P≤0.05.Results: At baseline (T0) kinematic outcomes were similar between groups (P>0.05). At T1 and T2 MAE showed a greater improvement (p<0.05) than DI and C for the horizontal displacement from start to first pull, from start position to catch and from most forward position to catch. Moreover, significant differences were observed at T2 for the horizontal displacement from start position to beginning second pull and the vertical travel range for MAE vs C, no significant differences vs DI, despite MAE showed a greater improvement than DI.Conclusion: This study focused on the use of different types of instruction (MAE vs DI) in improving the bar path kinematics of weightlifters. In previous studies horizontal displacement and the vertical travel range of the barbell have been chosen to characterize an effective technique. Results showed that MAE rapidly improves motor performance in comparison with DI. The different approach of MAE is that it is an unlearning task rather than a re-teaching one, in this way the subject deletes forever the error with a full transfer of learning.References. 1. Milanese C et al. (2008). “Amplification of error”: a rapidly effective method for motor performance improvement. The Sport Psychol, 22, 164-174
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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