Effect of Adding Cognitively Demanding Tasks on Soccer Skill Performance

1992 ◽  
Vol 75 (3) ◽  
pp. 955-961 ◽  
Author(s):  
Matthew D. Smith ◽  
Craig J. Chamberlin

The effect of adding cognitively demanding elements to the performance of a real-world motor task in which functional interference among the elements in performance existed was investigated across level of expertise. The primary task involved running as quickly as possible through a 15.25-m slalom course. Two secondary tasks were used, dribbling of a soccer ball and identification of geometric shapes projected on a screen located at the end of the slalom course. 4 novice, 5 intermediate, and 5 expert female soccer players served as subjects and performed three trials each of three experimental conditions: running through the slalom course, running through the slalom course while dribbling a soccer ball, and running through the slalom course while dribbling a soccer ball and identifying geometric shapes. Analysis of variance using a 3 (experimental condition) × 3 (level of expertise) design gave significant main effects and a significant interaction. The latter indicated that, although the addition of cognitively demanding elements caused a decrement in performance, the amount of decrement decreased as level of expertise increased. It was concluded that structural interference between elements of performance decreased the positive effect of automation of one element on dual task performance.

Author(s):  
SeungGeun Baeck ◽  
KangHyun Shin ◽  
JongHyun Lee ◽  
ChangGoo Heo

The purpose of this study was to examine the positive effect of self-monitoring among emotional display rules (fostering positive emotion(FPE) & suppressing negative emotion(SNE)) and consequential work attitude (job burnout & work engagement). A sample of 191 hotel employees were participated in this study and data were analyzed by SPSS. The results are as follows. First, the main effect of FPE on work engagement was supported, but the main effect of SNE on job burnout was not. Second, the main effects of self-monitoring on engagement and burnout were supported. Third, the moderation effects of self-monitoring which buffer the relationship of SNE on burnout and which facilitate the relationship FPE on engagement were significant. Finally, the implications and limitations were discussed.


2021 ◽  
Vol 11 (40) ◽  
pp. 168-169
Author(s):  
Denise Lessa Aleixo ◽  
Leoni Vilano Bonamin ◽  
Silvana Marques De Araujo

Introduction: The use of homeopathic medicines has increased, once traditional medicines sometimes do not produce the desired effects and because side effects sometimes compromise the treatment. In recent years, research on homeopathy has clearly developed, both in the implementation of more consistent methodologies and in the description of the data and published methods, improvement are still required in these matters. The acknowledgment of homeopathy depends on the credibility of the groups researching this topic Objective: list and criticize articles highlighting main effects, schedule of treatment and potencies used in different animals models. Material and Methods: A review of articles published since 2000 in journals indexed in the PubMed/Scielo databases was performed. Keywords used were parasitosis/homeopathy and parasitosis/ultra-diluted, in English and Portuguese. Specialized journals such as Homeopathy, International Journal of High Dilution Research, and Brazilian Homeopathic Journal were also used. The contents of each issue of these journals were examined for the "Use of highly diluted medication in parasitic infections." Results and Discussion: Thirty nine papers have been gathered. The methodology of the articles surveyed did not meet the requirements listed in the REHBaR[1]. Thirty seven reports have shown the benefits/effects of highly diluted medicine in the treatment of infectious diseases. In models where experimental conditions are carefully controlled, the conclusions follow the same pattern as those observed in the treatment of farm animals, where, even without completely controlled conditions, clinical result is positive. In fourteen reports using the same model, eight where animals were treated in a constant and prolonged way shown a better result, compared with six reports in which animals were treated for a short period of time, receiving a single daily dose. Several authors have conducted clinical trials using commercial formulas, which do not always provide their composition and/or dynamization, making it difficult to reproducing the experiment. In some of the articles, it was not mentioned if the experiments were repeated at least twice. Conclusions: In parasitic infections, the effect of homeopathic medications is still controversial, and the experimental parameters for evaluation shoud be carefully chosen to avoid isolated analyses of data. Researchers should consider results regarding environmental and sanitary conditions of the animal as a whole. The improvement of techniques and expansion of knowledge about highly diluted medicines may lead to a viable alternative to treat parasitic infections. Precise and detailed descriptions will contribute to advances in the use of homeopathy, so that the wider community can benefit, in practice, from these findings. Keywords: homeopathy, parasitic infections, CAM (Complementary and Alternative Medicine). Reference [1] Lüdtke R, Musial F, Wijk R, Witt C, Baumgartner S. Reporting experiments in homeopathic basic research (REHBaR) – A detailed guideline for authors. Homeopathy. 2009; 98:287-298.


2009 ◽  
Vol 101 (3) ◽  
pp. 1690-1694 ◽  
Author(s):  
Laura Avanzino ◽  
Marco Bove ◽  
Andrea Tacchino ◽  
Carlo Trompetto ◽  
Carla Ogliastro ◽  
...  

One-hertz repetitive transcranial magnetic stimulation (1Hz-rTMS) over ipsilateral motor cortex is able to modify up to 30 min the motor performance of repetitive finger opposition movements paced with a metronome at 2 Hz. We investigated whether the long-lasting rTMS effect on motor behavior can be modulated by subsequent engagement of the contralateral sensorimotor system. Motor task was performed in different experimental conditions: immediately after rTMS, 30 min after rTMS, or when real rTMS was substituted with sham rTMS. Subjects performing the motor task immediately after rTMS showed modifications in motor behavior ≤30 min after rTMS. On the other hand, when real rTMS was substituted with sham stimulation or when subjects performed the motor task 30 min after the rTMS session, the effect was no longer present. These findings suggest that the combination of ipsilateral 1Hz-rTMS and voluntary movement is crucial to endure the effect of rTMS on the movement itself, probably acting on synaptic plasticity-like mechanism. This finding might provide some useful hints for neurorehabilitation protocols.


1980 ◽  
Vol 51 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Lee Baer

Three female subjects were hypnotized and played a video-tennis game under alternating control and experimental conditions in a within-subjects ABABAB withdrawal design. During control phases, subjects played the game under conditions of hypnotic relaxation. Prior to experimental phases a suggestion for subjective time-slowing, and ball-slowing, was presented. The initial presentation of the time-slowing suggestion did not result in improved performance accuracy However, for all subjects, the second and third presentation of the suggestion resulted in significantly more longer volleys during experimental periods as compared to control periods. Possible explanations of the processes underlying improved performance accuracy are discussed in light of the subjective reports of the participants.


2002 ◽  
Vol 45 (5) ◽  
pp. 844-857 ◽  
Author(s):  
Hans-Georg Bosshardt ◽  
Waltraud Ballmer ◽  
Luc F. de Nil

The aim of the present experiment was to investigate differences between persons who stutter and persons who do not stutter during the production of sentences in a single task versus two dual-task conditions. Participants were required to form a sentence containing 2 unrelated nouns. In dual-task conditions, rhyme and category decisions were used as secondary tasks. The results for 14 adults who stutter and 16 adults who do not stutter are reported. Dependent variables were the number of correct rhyme and category decisions, decision latencies, length, number of propositions, sentence latency, speech rate of sentences, disfluencies, and stuttering rates. The results indicated that both groups reduced the average number of correct rhyme and category decisions when this task was performed concurrently with sentence generation and production. Similarly, the 2 groups of participants did not differ with respect to the correctness and latency of their decisions. Under single-task conditions the sentences of both groups had a comparable number of propositions. But under dual- as compared with singletask conditions persons who stutter significantly reduced the number of propositions whereas persons who do not stutter did not show a significant dual- versus single-task contrast. Experimental conditions did not significantly influence stuttering rates. These results suggest that persons who stutter require more processing capacity for sentence generation and articulation than persons who do not stutter and that both groups keep stuttering rates at a constant level by adjusting the number of propositional units of their linguistic productions. The results support the view that the organization of the speech-production system of persons who stutter makes it more vulnerable to interference from concurrent attention-demanding semantic tasks.


1967 ◽  
Vol 25 (1) ◽  
pp. 25-35
Author(s):  
Lee E. Doerries ◽  
E. Rae Harcum

Threshold durations were determined by the Method of Limits for a series of 8-letter nonsense words. For experimental Os the threshold for a critical word was obtained a second time after threshold determinations for 0, 1, 2, 4, or 8 different filler-words had intervened. For control Os no word was repeated in the series. Instructions introduced a set against seeing any word again after its threshold had been obtained the first time. The second threshold for a critical word was lower than the first for all experimental conditions; this effect could not be attributed to practice. The greatest effect occurred when 2 filler-words intervened. The positive effect after 8 words had intervened indicates that the trace was still present after 7 min. Greater threshold decrements for special control groups, for whom the interpolated activity was unrelated to the experimental task, indicate a consolidation effect on the trace under those conditions.


1998 ◽  
Vol 32 (3) ◽  
pp. 290-297 ◽  
Author(s):  
Miquel Borràs

Splenic iron stores are negligible in prepuberal rats, increasing quickly from the age of 2 months (at which moment sexual differences become apparent) and stabilizing around 3 months, when females show values approximately two-fold greater than males. Castration, adrenalectomy and hormone replacement studies show that the amount of iron stored depends directly on circulating oestrogens and is slightly but not significantly decreased, in our experimental conditions, by testosterone. The role of oestrogens is emphasized by the high correlation obtained, according to a hyperbolic regression model, between splenic iron values and doses of hormone administered to ovariectomized females. In ferrodeficient females (chronic phlebotomy), oestradiol had a positive effect on the replenishment of the stores, superior to that of iron dextran, and improved by combined treatment. However, iron levels found after a single dose were less than those found in non-phlebotomized animals.


1990 ◽  
Vol 12 (2) ◽  
pp. 144-156 ◽  
Author(s):  
Robert Weinberg ◽  
Howard Garland ◽  
Lawrence Bruya ◽  
Allen Jackson

The present investigation tested the interactive effects of goal difficulty and positive reinforcement in the form of verbal persuasion on endurance performance. Two experiments were conducted in laboratory and field settings. In Experiment 1, subjects (n=87) were assigned to a realistic or an unrealistic goal condition and either received or did not receive positive reinforcement while performing the 3-minute sit-up test over the course of 5 weeks. In addition, two control conditions were utilized including a do-your-best group and a no-treatment control group. Results indicated no significant main or interaction effects for the goal setting or positive reinforcement conditions. In Experiment 2, subjects (n=120) squeezed a hand dynamometer for as long as they could. Experimental conditions were similar to those in Experiment 1 except that the verbal persuasion was individualized since it was group oriented in the first experiment. Results again indicated no significant between-subjects main effects or interactions. Questionnaires revealed that subjects accepted their assigned goals, tried extremely hard, were committed to achieving their goals, and felt their goals were important. Results are discussed in terms of the goal attainability notion (Garland, 1983) and self-efficacy theory (Bandura, 1977). Future directions for research are offered.


Plant Disease ◽  
1999 ◽  
Vol 83 (5) ◽  
pp. 474-481 ◽  
Author(s):  
J. H. M. Schneider ◽  
P. H. J. F. Van den Boogert ◽  
J. C. Zadoks

Experiments were conducted to explore differential interaction of Rhizoctonia solani AG 2-t isolates on tulip cultivars in soil artificially infested under different experimental conditions. Comparison of residual variances obtained by analysis of variance and by analysis of additive main effects and multiplicative interaction effects (AMMI) showed that open-air experiments should be used for interpretation of isolate by cultivar interaction. In open-air experiments, variability was lower than in greenhouse tests. In the biplot, derived after AMMI-analysis over isolates by years and by cultivars, isolates tended to occur in year clusters, indicating a differential effect of year on disease expression. Three isolates occurred in isolate clusters, thus accounting for a significant year by isolate by cultivar interaction. One cluster consisted of three isolates high in aggressiveness on all tested tulip cultivars, and another cluster consisted of three isolates low in aggressiveness. Greenhouse conditions and inoculum carrier significantly influenced quantitative differential interaction patterns. Isolates grown on oat kernels were more aggressive than those grown on autoclaved perlite particles soaked in liquid malt peptone. Differential interaction of AG 2-t isolates on tulip cultivars does occur, although it cannot yet be disentangled completely.


1997 ◽  
Vol 8 (5) ◽  
pp. 404-408 ◽  
Author(s):  
Michelle Papka ◽  
Richard B. Ivry ◽  
Diana S Woodruff-Pak

Dual-task performance was assessed in 140 adults during eyeblink classical conditioning (EBCC) and one of several secondary tasks (timed-interval tapping, recognition memory choice reaction time, video viewing) Four groups received paired-EBCC stimulus presentation and three groups received explicitly unpaired EBCC stimuli Although the subjects were not told about the conditioning task, they acquired conditioned responses (CRs) at normal levels Postsession interviews probed participants' awareness of EBCC stimulus contingencies and production of CRs Reported awareness of paired-EBCC stimulus contingencies and CR production was not related to actual EBCC performance Twenty-seven percent of the participants receiving explicitly unpaired stimuli reported a stimulus contingency when none existed The dissociation between awareness and performance provides additional support for the categorization of simple EBCC as a form of nondeclarative learning


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