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Samples of reaches were obtained from groups of infants aged 4.5, 6, and 7.5 months. Split-screen video recordings were transcribed as sequences of (x,y,z) hand coordinates, and the hand path was examined for evidence of initial aiming and subsequent correction of the movement path. At all ages, the initial direction of the movement was correlated with target direction, providing evidence that the hand was aimed toward the target. Additionally, changes in movement direction made after the commencement of the movement tended to curve the hand path toward the target, providing evidence of error correction. Local minima of hand speed evident within segments of continuous motion were associated with turn toward the target. However, the movement path was also curved toward the target within the movement elements bounded by these minima. This finding was seen as consistent with "continuous" correction of movement errors and as contrary to the suggestion that infant movements are concatenations of ballistic movement units whose boundaries are marked by troughs in the speed profile. 相似文献
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Claire Turner 《Emotional and Behavioural Difficulties》2013,18(4):13-18
This paper has been written from the perspective of John, a year 9 pupil with emotional and behavioural difficulties. The intention of the research was to gain a clearer understanding of the factors affecting John's behaviour, and consequently, his learning. The research indicates that it is primarily the breakdown of the teacher‐pupil relationship that affects John's behaviour. Other factors include his need to communicate with peers and his poor concentration span. The research demonstrates the importance of gaining pupil perception and acting on this information when differentiating in the learning environment to include pupils with emotional and behavioural difficulties. 相似文献
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Gareth Turner Barry W Fudge Jamie S M Pringle Neil S Maxwell Alan J Richardson 《Journal of sports sciences》2019,37(2):163-172
This study sought to establish perceptions of elite endurance athletes on the role and worth of altitude training. Elite British endurance runners were surveyed to identify the altitude and hypoxic training methods utilised, along with reasons for use, and any situational, cultural and behaviour factors influencing these. Prior to the 2012 Olympics Games, 39 athletes and 20 support staff (coaches/practitioners) completed an internet-based survey to establish differences between current practices and the accepted “best-practice”. Almost all of the athletes (98%) and support staff (95%) surveyed had utilised altitude and hypoxic training, or had advised it to athletes. 75% of athletes believed altitude and hypoxia to be a “very important” factor in their training regime, with 50% of support staff believing the same. Athletes and support staff were in agreement of the methods of altitude training utilised (i.e. 'hypoxic dose’ and strategy), with camps lasting 3–4 weeks at 1,500–2,500 m being the most popular. Athletes and support staff are utilising altitude and hypoxic training methods in a manner agreeing with research-based suggestions. The survey identified a number of specific challenges and priorities, which could provide scope to optimise future altitude training methods for endurance performance in these elite groups. 相似文献
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With the tertiary education mantra of creativity, critical thinking and innovation in mind, we consider the critical-creativity of error. Taking the university to model social orthography, or ‘correct writing’, according to the norms of disciplines, we consider the role of error in the classroom. Looked at another way, error questions the norms governing norms and the instability of disciplinary grounds. Beyond correction, error involves a mis-taking, or taking another way. Tracing the origin of error we are able to reconstruct the social world in terms of which it is conceivable for a mistake of any kind to have been made. The university, we find, withholds worlds which are not new but are sources of creativity, and constitutes a pluriversity or poly-versity. 相似文献
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