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This research aims at studying the effect of different Practice Schedules (Blocked, Random, and systematically increasing) on acquisition, retention and transfer different basketball pass Species (overhead, chest and single arm). Subjects included 45 secondary male students (Mean age 17.14± 0.75) whom were assigned into three matched groups Blocked, Random and systematically increasing (its mention increasing systematically contextual interference to in training duration) following pretest. The subjects didn’t have any experience in playing basketball. At the determined and given condition for each group, subjects performed the task for 9 sessions 9 trials in each session. After 24 hour, retention and transfer tests with 4 trials in each pass were taken. Results showed effect of practice session was significant but no significant difference in acquisition between groups. In retention and transfer tests, there were significant differences between mean scores of practice groups, that supported Magill and Hall theory (1990) and challenge point idea of Guadagnoli and Lee (2004).

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The purpose of this study was the comparison of the required time and repetition for the acquisition of simple and complex timed motor sequenced task (TMST) among various practical conditions and determination of suitable practical methods with respect to individual characteristics. One hundred and fourteen university students, with the age range of 19-25 years old, were divided in 4 groups  according to Raven Intelligence test, Achievement Motivation Test, Reaction time and Purdue pegboard, and based on the first, second and third quadrants. Then they were randomly placed in one of the two groups of simple and complex TMST and also in one of the practical conditions of the interaction of the organization of practice (random, blocked, constant), and practical distribution (massed, distributed). The subjects trained 6 days under their specific practical condition of simple or complex TMST, in a way they reached to the acquisition criterion (accuracy %75, timing %25, stability %15) in a practical training block. The number of repetitions and passage of time before this criterion block were considered as the minimum required time and repetition for acquisition of TMST. The data were analyzed using two-factor analysis of variance, independent t-test and Xi - 2 test (=&alpha0.1). The results showed individuals with different characteristics have acquired simple TMST in blocked and  massed condition (except group ) in average within 30 repetitions and 1347 minutes, and complex TMST in random and distributed condition (except group ) in 25 repetitions and 1228 minutes. In addition, the findings showed that the principles of practical programming is affected by both the complexity level of task and individual characteristics. At last, it seems there is a need of more studies on the combination effect of the environment, individual and task on the acquisition fine motor skills. 

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The purpose of this study was to explore the effectiveness of the number of practice trials in determining the degree of task complexity. Sixty subjects according to the types of tasks (A-B) and receiving feedback (100%, omitted, self-control) were randomly divided into six groups.All of the subjects practiced 100 trials tasks in each day on first two days. Retention tests were performed during the second and third day and reacquisition tests were performed on the third day. Using ANOVA with repeated measures showed found that,all of the subjects improved across practice trials on both days but this improvement in B task was significantly better than A task on the second day. Subjects were significantly better in the second retention and reacquisition tests compare with first one’s, in addition subjects that practiced B task were better than those that practiced A task in the second retention test (p<0.05). Results indicate that A task was more complex than B task, and the optimal practice trials is required to understanding which task is complex.

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The purpose of this study was to examine the effect of self-control feedback on the learningof generalized motor program and parameters during physical and observational practice. Participants (n=90) were randomly assigned to physical and observational practice (self-control, yoked and instructor KR) groups. They practiced a sequential timing task. The task required participants to press four keys (2, 6, 8, and 4).They performed 72 trials during the acquisition phase and 12 in retention and transfer phase. The analyses demonstrated that during the acquisition phase, relative timing errors were lower for the self-control and instructor groups. During the retention and transfer phase, relative timing errors were lower for the self-control groups and instructor groups. This might explain self-control feedback and physical practice develop the generalized motor program but not parameter learning and support the theoretical separation of GMP and parameter processes.

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Recent evidence suggest that massive amount of practice of a skill results in the development of a specific memory representation that is distinguished by its enhanced performance capability relative to the other members of the same class that is uniqe and termed 'Especial Skill'. This study aimed to investigate the emergence of special skill and reevaluation the visual-context hypothesis using badminton players in three skill levels (expert, skilled, less-experienced). Subjects (10 players in each group, mean age=23.12 ±3.85 years) performered 100 backhand short serves at five distances (1.5, 2, 2.5, 3, 3.5 meters from net) in each of environmental conditions (normal and covered court). The regression analyze showed that accuracy in skilled group at 2 meters distance was significantly better than predicted by regression equation, supporting the especial Skill effect, but it wasn’t showed in two other groups. This specific advantage of practice at this point was not emerged at absence of visual cues that supported the visual-context hypothesis.

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According to Specificity of practice hypothesis, availability of visual information
specially during performing tasks witch vision has an important role in improving
the accuracy, causes further performance decrements in No-vision transfer test.
The purpose of the current study was to examine the effects of vision and amount
of practice on accuracy and kinematic of dart throwing. 20 female students of righthanded
who were all novitiate in the skill selected voluntarily and randomly
assigned to full vision and No-vision groups.The subjects following participated in
pretest, performed acquisition phase that consisted two level of modest and
extensive practice (45 trials and 300 trials). 10 minutes after each level of practice,
participants completed transfer trials in a no-vision and no-KR condition. Overall,
Mixed ANOVA (2×3) in acquisition phase revealed that vision improved Dart
throwing accuracy performance. Kinematic analysis revealed no significant
difference between two groups in Wrist flexion, Angular displacement of elbow and
Angular displacement of shoulder. Whereas after 300 trials of practice, there was
significant difference between groups in throwing time and angular velocity of the
dart. After extensive practice, Mixed ANOVA (2×2) showed that, withdrawal of
vision resulted in specificity of practice effects on dart throwing accuracy, but
results of kinematic pattern, regardless of the amount of practice did not support
specificity of practice.

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The purpose of this study was to examine the effect of mental training compared with physical training on on foot joints and accuracy of instep penalty kick in soccer. Method research was a quasi-experimental. 33 male students of Mazandaran University organized in three groups (physical training group, mental training group and control group). After pre-test, mental and physical training groups did their practices and then participated in post-test. Kinematic data were recorded with a camera (JVC, 200HZ), and each penalty score was considered as an indicator of accuracy. Lower extremity joints (hip, knee and ankle) angle in sagittal plane and ball to foot velocity index were calculated with MATLAB2010 software. To find differences, ANOVA and tukey test was done with SPSS18 (α=0.05). Range of motion of hip and ankle joints had positive significant effect with accuracy (r=0.415 and r=0.562 respectively), but there was no significant effect between knee range of motion and accuracy. Regard to this research, we could propose to soccer trainers both practice manners depend on their conditions.

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The purpose of this study was to investigate the effect of practice variability in physical compared with observational practice on golf putting performance. To this end, 50 male right-handed students (25±3.7 years) of the Ferdowsi University of Mashhad participated in this study. Participants were randomly divided into 5 groups (physical constant, physical variable, observational constant, observational variable, and control). During acquisition, the physical variable group randomly performed 50 trials from 5 different starting points to 2 different targets, but the physical constant group performed 50 trials from one starting point to one predetermined target. The observational variable and constant groups observed the performance of the physical variable and constant groups, respectively. The control group just participated in pre-and post-tests and did not practice any trial. Participants performed a test just like the pre-test 10 minutes and also 24 hours after practice. Putting accuracy was measured as the dependent measure. Results showed that variability of practice had a positive effect on participants’ performance than constant practice in physical and observational conditions (all P<0.05). Maybe the similar underlying mechanisms and also the similar feedback effects resulted in the higher performance of the variable group than the constant group in physical performance and action observation.

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The literature on self-controlled motor learning includes efforts that compare a group of learners who have choices about some aspect of their practice environment with a group who are dependent on those choices. Therefore, several studies have shown that self-control practices have benefits. In the present study, using the self-control approach, the choice order during golf practices, the level of skill accuracy, autonomy, and self-efficacy were investigated. The present research is of a semi-experimental type and was carried out during the 24-hour follow-up period. Twenty-four beginner students were available and randomly placed in the experimental group (n=12) or yoked group (n=12). In the pre-test, the participants took the golf putting test. Then the yoked group used the practicum devices in the order of choice of the experimental group. On the first day, skill accuracy, autonomy, and self-efficacy were measured in the pre-test and acquisition, and then with the retention test. The results of the repeated Measurements analysis test showed that self-control has a significant effect on golf putting skill, autonomy, and self-efficacy. Therefore, a small choice such as the order of practice in the self-control approach can be effective on motor performance and learning, and the psychological components related to them.