Self-Controlled Practice Within a Fixed Time Period Facilitates the Learning of a Basketball Set Shot

2014 ◽  
Vol 2 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Phillip G. Post ◽  
Jeffrey T. Fairbrother ◽  
Joao A. C. Barros ◽  
J. D. Kulpa
Keyword(s):  
Motor Learning ◽  
Instructional Support ◽  
Fixed Time ◽  
Relevant Information ◽  
Self Control ◽  
Time Period ◽  
Trial Basis ◽  
Practice Trials ◽  
Additional Support ◽  
Do So

Allowing self-control over various modes of instructional support has been shown to facilitate motor learning. Most research has examined factors that directly altered task-relevant information on a trial-to-trial basis (e.g., feedback). Recent research suggests that self-control (SC) effects extend to the manipulation of other types of factors (e.g., total number of practice trials completed). This research also illustrated that learners sometimes select a very small amount of practice when given latitude to do so. The purpose of the current study was to examine the effects of SC practice within a fixed time period on the learning of a basketball set shot. SC participants chose when to attempt each shot within two 15-min practice sessions, thereby controlling both the total number of shots taken and the spacing of shots. Yoked participants completed the same number of shots as their SC counterparts. Spacing of shots was also matched across groups. The SC group was more accurate and had higher form scores and longer preshot times during retention. These findings provided additional support for the generalizability of SC effects and extended prior research, showing that autonomy over total practice duration was not a prerequisite for the observed effects.

Utilization of remote sensing for estimation of scale of cutting and growing of forest zones

2017 ◽  
Vol 920 (2) ◽  
pp. 57-60
Author(s):  
F.E. Guliyeva
Keyword(s):  
Remote Sensing ◽  
Fixed Time ◽  
Time Interval ◽  
Time Points ◽  
Average Value ◽  
Time Period ◽  
Remote Estimation ◽  
The Given ◽  
Forest Cutting

The study of results of relevant works on remote sensing of forests has shown that the known methods of remote estimation of forest cuts and growth don’t allow to calculate the objective average value of forests cut volume during the fixed time period. The existing mathematical estimates are not monotonous and make it possible to estimate primitively the scale of cutting by computing the ratio of data in two fixed time points. In the article the extreme properties of the considered estimates for deforestation and reforestation models are researched. The extreme features of integrated averaged values of given estimates upon limitations applied on variables, characterizing the deforestation and reforestation processes are studied. The integrated parameter, making it possible to calculate the averaged value of estimates of forest cutting, computed for all fixed time period with a fixed step is suggested. It is shown mathematically that the given estimate has a monotonous feature in regard of value of given time interval and make it possible to evaluate objectively the scales of forest cutting.

A Method for Evaluating the Thermal Performance of Passenger Seats

2003 ◽  
Vol 217 (6) ◽  
pp. 449-459 ◽  
Author(s):  
E B Ratts ◽  
J W McElroy ◽  
W G Reed
Keyword(s):  
Thermal Performance ◽  
Thermal Energy ◽  
Water Source ◽  
Fixed Time ◽  
Test Method ◽  
Test Apparatus ◽  
Passenger Seat ◽  
Time Period ◽  
Seat Cushion ◽  
Heat And Moisture

In this paper, an experimental method to quantify the capability of an automotive seat to move heat and moisture away from the heat and water source is presented. To test the method, a test apparatus was constructed that generates heat and water vapour. The apparatus was placed on a seat cushion for a fixed time period. At the end of the period, heat and water transported were measured. These integrated values were used to quantify the seat's capability to move heat and moisture and ultimately to compare seats. By the impulse test method, the passenger seat had an effusivity of 94.7 W s1/2/m2 K. A non-ventilated seat transferred 5 W of thermal energy and an average of 0.36 g/min of water in 1800 s. A ventilated seat transferred 13.9 W of thermal energy and 0.70 g/min of water in 1800 s.

Mixture copulas and insurance applications

2018 ◽  
Vol 12 (2) ◽  
pp. 391-411
Author(s):  
Maissa Tamraz
Keyword(s):  
Joint Distribution ◽  
Stable Distribution ◽  
Random Variable ◽  
Fixed Time ◽  
Collective Model ◽  
Data Sets ◽  
New Model ◽  
Time Period ◽  
Insurance Data ◽  
Dependence Property

AbstractIn the classical collective model over a fixed time period of two insurance portfolios, we are interested, in this contribution, in the models that relate to the joint distributionFof the largest claim amounts observed in both insurance portfolios. Specifically, we consider the tractable model where the claim counting random variableNfollows a discrete-stable distribution with parameters (α,λ). We investigate the dependence property ofFwith respect to both parametersαandλ. Furthermore, we present several applications of the new model to concrete insurance data sets and assess the fit of our new model with respect to other models already considered in some recent contributions. We can see that our model performs well with respect to most data sets.

scholarly journals An Interpretative Phenomenological Analysis of Token Resistance to Sex amongst Nigerian Undergraduates

2021 ◽  
Author(s):  
Alex Terver Igundunasse ◽  
Nathan Odiase
Keyword(s):  
Interpretative Phenomenological Analysis ◽  
Sampling Technique ◽  
Phenomenological Analysis ◽  
Self Control ◽  
Emotional Security ◽  
Sexually Active ◽  
Social Conventions ◽  
Token Resistance ◽  
The Subject ◽  
Do So

It is apparent that existing social conventions unofficially mandates women to refuse sexual advances even when there may be the intention to engage. The adherence to this social script is what is referred to as token resistance or scripted refusal. Some studies have explored the subject of token resistance from a number of perspectives that attempt to identify the underlying reasons why women engaging in token resistance. However, there is very little research on this subject from the Nigerian perspective. This this study sought to explore token resistance further in order to understand the cultural cogency or peculiarity of the concept in the Nigerian context. This is because based on available literature, the conceptualization of token resistance may be different. With the use of purposive sampling technique, four sexually active women and undergraduates, volunteered to participate in the study. They were interviewed to understand their unique experiences and perception about token resistance using the principles of Interpretative Phenomenological Analysis (IPA) It was discovered that factors like personal pride, self-control, emotional security of relationship and the gratification of increased attention were responsible for women’s rejection of sexual advances even when there was the intention to do so. The study also got a better understanding of how women culturally represent this concept in Nigeria. We highlight limitations of the study and suggest areas for further study research.

scholarly journals Existence and Exploitability of Financial Analysts' Informational Leadership

2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Rainer Baule ◽  
Hannes Wilke
Keyword(s):  
Abnormal Returns ◽  
Relevant Information ◽  
Trading Strategies ◽  
Information Share ◽  
Time Period ◽  
The Us ◽  
Information Shares ◽  
Set Up ◽  
The One

This paper bridges two recent studies on the role of analysts to provide new and relevant information to investors. On the one hand, the contribution of analysts to long-term price discovery on the US market is rather low. Considering earnings per share forecasts as the main output of analysts’ reports, their information share amounts to only 4.6% on average. On the other hand, trading strategies set up on these EPS forecasts are quite profitable. Self-financing portfolios yield excess returns of more than 5% over the S&P 100 index for a time period of 36 years, which is persistent after controlling for the well-known risk factors. In this paper, we discuss the link between the low information shares and the high abnormal returns. We argue that information shares of analysts cannot be higher, because otherwise their forecasts would lead to excessively profitable trading strategies which are very unlikely to persist over such a long period of time.

Following Gesture Following: Grounding the Documentation of a Multi-Agent Music Creation Process

2012 ◽  
Vol 36 (4) ◽  
pp. 59-80 ◽  
Author(s):  
Guillaume Boutard ◽  
Catherine Guastavino
Keyword(s):  
Conceptual Framework ◽  
Creative Process ◽  
Relevant Information ◽  
Musical Work ◽  
Levels Of Abstraction ◽  
Musical Works ◽  
Multi Agent ◽  
Ethnographic Data ◽  
Different Levels ◽  
Do So

The documentation of electroacoustic and mixed musical works typically relies on a posteriori data collection. In this article, we argue that the preservation of musical works having technological components should be grounded in a thorough documentation of the creative process that accounts for both human and nonhuman agents of creation. The present research aims at providing a ground for documentation policies that account for the creative process and provide relevant information for performance, migration, and analysis. To do so, we analyzed secondary ethnographic data from a two-year creation and production process of a musical work having a focus on gesture following. Using grounded theory, we developed a conceptual framework with different levels of abstraction and consequent levels of transferability to other creative contexts. Finally, we propose several paths for grounding a subsequent documentation framework in this conceptual framework.

scholarly journals Motor cost affects the decision of when to shift gaze for guiding movement

2019 ◽  
Vol 122 (1) ◽  
pp. 378-388 ◽  
Author(s):  
F. Javier Domínguez-Zamora ◽  
Daniel S. Marigold
Keyword(s):  
Center Of Mass ◽  
Relevant Information ◽  
Lateral Direction ◽  
Foot Placement ◽  
Factors Affecting ◽  
Direct Gaze ◽  
Trial Basis ◽  
Motor Actions ◽  
The Cost ◽  
The Brain

Frequent gait modifications are often required to navigate our world. These can involve long or wide steps or changes in direction. People generally prefer to minimize the motor cost (or effort) of a movement, although with changes in gait this is not always possible. The decision of when and where to shift gaze is critical for controlling motor actions, since vision informs the brain about the available choices for movement—in this case, where to step. Here we asked how motor cost influences the allocation of gaze. To address this, we had participants walk and step to the center of sequential targets on the ground. We manipulated the motor cost associated with controlling foot placement by varying the location of one target in the lateral direction on a trial-to-trial basis within environments with different numbers of targets. Costlier steps caused a switch from a gaze strategy of planning future steps to one favoring visual feedback of the current foot placement when participants had to negotiate another target immediately after. Specifically, costlier steps delayed gaze shifts away from the manipulated target. We show that this relates to the cost of moving the leg and redirecting the body’s center of mass from target to target. Overall, our results suggest that temporal gaze decisions are affected by motor costs associated with step-to-step demands of the environment. Moreover, they provide insight into what affects the coordination between the eyes and feet for the control of stable and accurate foot placement while walking. NEW & NOTEWORTHY Changes in gait allow us to navigate our world. For instance, one may step long or wide to avoid a spilled drink. The brain can direct gaze to gather relevant information for making these types of motor decisions; however, the factors affecting gaze allocation in natural behaviors are poorly understood. We show how the motor cost associated with a step influences the decision of when to redirect gaze to ensure accurate foot placement while walking.

scholarly journals Optimal Schedules in Multitask Motor Learning

2016 ◽  
Vol 28 (4) ◽  
pp. 667-685 ◽  
Author(s):  
Jeong Yoon Lee ◽  
Youngmin Oh ◽  
Sung Shin Kim ◽  
Robert A. Scheidt ◽  
Nicolas Schweighofer
Keyword(s):  
Motor Learning ◽  
Computational Models ◽  
Practical Importance ◽  
State Space Model ◽  
Retention Performance ◽  
Single Session ◽  
Term Retention ◽  
Long Term Retention ◽  
Do So

Although scheduling multiple tasks in motor learning to maximize long-term retention of performance is of great practical importance in sports training and motor rehabilitation after brain injury, it is unclear how to do so. We propose here a novel theoretical approach that uses optimal control theory and computational models of motor adaptation to determine schedules that maximize long-term retention predictively. Using Pontryagin’s maximum principle, we derived a control law that determines the trial-by-trial task choice that maximizes overall delayed retention for all tasks, as predicted by the state-space model. Simulations of a single session of adaptation with two tasks show that when task interference is high, there exists a threshold in relative task difficulty below which the alternating schedule is optimal. Only for large differences in task difficulties do optimal schedules assign more trials to the harder task. However, over the parameter range tested, alternating schedules yield long-term retention performance that is only slightly inferior to performance given by the true optimal schedules. Our results thus predict that in a large number of learning situations wherein tasks interfere, intermixing tasks with an equal number of trials is an effective strategy in enhancing long-term retention.

scholarly journals Cabinets, Prime Ministers, and Corruption: A Comparative Analysis of Parliamentary Governments in Post-War Europe

2018 ◽  
Vol 67 (1) ◽  
pp. 149-170
Author(s):  
Hanna Bäck ◽  
Jan Teorell ◽  
Staffan I Lindberg
Keyword(s):  
Prime Minister ◽  
Control Mechanisms ◽  
Prime Ministers ◽  
Political Actors ◽  
East European ◽  
Parliamentary Democracies ◽  
Time Period ◽  
Post War ◽  
High Level ◽  
Do So

Why are some states more corrupt than others? Drawing on the literature on governance in parliamentary democracies, we suggest that the degree of corruption depends on the ability of key political actors to control ministers who have been delegated power. We argue that the Prime Minister has incentives to limit corruption within the cabinet and has the ability to do so when there are certain “control mechanisms” at hand. One such mechanism is the PM’s ability to fire or demote ministers who are not behaving in accordance with his or her wishes. We hypothesize that governmental corruption will be lower in systems where the constitution grants the PM strong powers. Using a new dataset ( Varieties of Democracy), which provides more specific measures on high-level corruption across a longer time period, we analyze corruption in 26 West and East European democracies over the post-war period and find support for our hypothesis.

Burn-in Procedure Based on a Dependent Covariate Process

2015 ◽  
Vol 47 (2) ◽  
pp. 506-529
Author(s):  
Ji Hwan Cha ◽  
Gianpaolo Pulcini
Keyword(s):  
Infant Mortality ◽  
Fixed Time ◽  
Optimal Parameters ◽  
Numerical Example ◽  
Elimination Procedure ◽  
Time Period ◽  
Actual Operation ◽  
Theoretical Results ◽  
Satisfactory Quality

Burn-in is a method of ‘elimination’ of initial failures (infant mortality). In the conventional burn-in procedures, to burn-in a component or a system means to subject it to a fixed time period of simulated use prior to actual operation. Then those which fail during the burn-in procedure are scrapped and only those which survived the burn-in procedure are considered to be of satisfactory quality. Thus, in this case, the only information used for the elimination procedure is the lifetime of the corresponding item. In this paper we consider a new burn-in procedure which additionally employs a dependent covariate process in the elimination procedure. Through the comparison with the conventional burn-in procedure, we show that the new burn-in procedure is preferable under commonly satisfied conditions. The problem of determining the optimal burn-in parameters is also considered and the properties of the optimal parameters are derived. A numerical example is provided to illustrate the theoretical results obtained in this paper.

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