Alihossein Naseri; Abbas Bahram; Hamid Salehi; Afkham Daneshvar
Abstract
The aim of this study was to determine the effects of errorless practice on learning an aiming skill in mentally retarded adolescents. 40 mentally retarded adolescents were assigned to four practice groups based on intelligence quotient and working memory capacity. The task was to throw basketball mini ...
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The aim of this study was to determine the effects of errorless practice on learning an aiming skill in mentally retarded adolescents. 40 mentally retarded adolescents were assigned to four practice groups based on intelligence quotient and working memory capacity. The task was to throw basketball mini balls into a target with concentric circles. The practice of groups was different from each other. The subjects performed 200 practice attempts in 5 practice blocks in the acquisition stage. Single task and dual task tests were implemented immediately, with 24-hour latency and one-week latency. The secondary task involved counting even numbers forward. The results showed that the groups with the least error and the least involvement in work memory during the practice outperformed other groups in acquisition stage, the single task test and dual task test. The findings of this study were consistent with the Adam's closed loop theory, the reinvestment theory, and the estimates of the challenge point framework regarding errors in the acquisition stage, but they were contradictory with the estimates of the schema theory. These findings also provided evidence to support the claim of the challenge point framework and the reinvestment theory about special individuals (mentally retarded).
Ali Pashabadi; Alireza Farsi; Abbas Bahram; Afkham Daneshfar
Abstract
Successful anticipation is a key factor for success in saving soccer penalty kick for goalkeepers and introducing optimal interventions to enhance this ability can be useful for improving the level of performance. The aim of the present study was to examine the effect of quiet eye training on anticipation ...
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Successful anticipation is a key factor for success in saving soccer penalty kick for goalkeepers and introducing optimal interventions to enhance this ability can be useful for improving the level of performance. The aim of the present study was to examine the effect of quiet eye training on anticipation of penalty kick by expert goalkeepers and their gaze behaviors during this anticipation. Participants were 20 expert goalkeepers working in Tehran pro league matches who were randomly assigned to training and placebo groups and passed tests and training interventions. Gaze data were registered using Pupil eye tracker and penalty kick anticipation was recorded using temporal occlusion paradigm. 30 videos of real penalty kicks by expert soccer players were recorded and ball-foot contact moments were occluded so that goalkeepers could anticipate the direction of ball kicking in those videos. Results of 2*4 mixed ANOVA showed that despite of homogeneity of training and placebo groups in pretest (P>0.05), training group had advantage in other phases and this advantage was maintained under pressure (P<0.05). The training enhanced successful anticipation and changed gaze behaviors proportional to successful anticipation and these changes were sustained during 72 hours of retention and transfer test under pressure. Training interventions based on quiet eye can be used as a training package along with physical training and skills of soccer goalkeepers and therefore help them to improve perceptual capabilities and to optimally use visual signs.
Mojtaba Jalalvand; Abbas Bahram; Afkham Daneshfar; Saeed Arsham
Abstract
Aim: This study aimed to determine effect of self-control of task difficulty on accurate and movement pattern golf putting. Methodology: Thirty novice undergraduate students (14 Female and 16 male; average age 21.1 ± 1.64 years) were quasi-randomly assigned to two groups. Before performing each ...
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Aim: This study aimed to determine effect of self-control of task difficulty on accurate and movement pattern golf putting. Methodology: Thirty novice undergraduate students (14 Female and 16 male; average age 21.1 ± 1.64 years) were quasi-randomly assigned to two groups. Before performing each trial during the acquisition phase, the self-control group was told they could choose any of the pre-set distances from the target: (25, 50, 75, 100, 125, 150, 175 and, 200 cm). Each self-control participant’s practice schedule was served as the predetermined practice schedule for each corresponding yoked participant. Participants practiced eight blocks of 10 trials. To analyze the radial error (in acquisition and tests phases) and the movement pattern score (in tests) mixed variance analysis with repeated measures on the last factor was used. The movement pattern score in acquisition phase was analyzed using t test. Results: Based on the results, radial errors across different groups in the acquisition phase did not vary, but the radial error of the self-control group in retention, single task transfer and dual-task transfer tests was lower compared to the yoked group (ps < 0.001). In acquisition and test phases, the golf putting movement pattern was better than that of yoked group (ps < 0.001). Conclusion: The efficacy of self-control of task difficulty is explained with reference to the challenge point framework.
Ghazal Mohamadi; Masomeh Shojaei; Afkham Daneshfar
Abstract
The purpose of the present study was to investigate the effect of variability of attentional focus distance by self-talk on the learning of table tennis forehand in. After pretest, the participants performed 180 forehand strokes during 6 sessions with repeating the words “slightly rotation” ...
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The purpose of the present study was to investigate the effect of variability of attentional focus distance by self-talk on the learning of table tennis forehand in. After pretest, the participants performed 180 forehand strokes during 6 sessions with repeating the words “slightly rotation” in the internal focus group “slightly open” in the near external focus group, “over the net ” in the far external focus group, and each of the words “slightly rotation, slightly open, and over the net ” respectively in each 2 sessions in the increasing distance of attentional focus group. Control group performed without self-talk during acquisition phase. Retention test was performed 48 hours after acquisition test in the same situation without self-talk, and after break, transfer test was done by changing the direction of target (parallel forehand) without self-talk. The accuracy and the pattern of forehand strokes were measured by a 5 point-scale (Liao and Masters, 2001) and researcher-made scale, respectively) .According to the results of 2-factor mixed ANOVA, acquisition, retention, and transfer of forehand accuracy in internal focus of attention group were significantly lower than other groups (p<0.05).Furthermore, the effect of increasing attentional focus distance on acquisition of forehand pattern was significant. The effect of near external attentional focus on retention of pattern was significant. But transfer of stroke pattern in control group was significantly more than far external focus group (p<0.05). Thus, it is recommended to use self-talk by increasing attentional focus and near external attentional focus and not to use internal focus of attention to instruct forehand to novice adolescents.
