The purpose of this study was to determine the effects of video modeling on skill acquisition in learning the golf swing. One-hundred-eight college students participated in this study. All participants were pre-tested via videotaping to determine initial skill level. The pre-test videotaping was analyzed using DartTrainer software. Each participant was randomly assigned to one of three groups (1) control (2) single-view or (3) multi-view. Participants in the control group viewed a compact disc (CD) with a putting demonstration repeated 40 times. The participants in the single-view group viewed a CD with a front view only demonstration repeated 40 times of the golf swing with a driver. Participants in the multi-view group viewed a CD with a multi-view (front, back, left, and right) demonstration of the golf swing using a driver. The demonstration was performed by a golf professional and each view was repeated 10 times for a total of 40 repetitions. After five weeks of CD viewing, practice, and class instruction, participants were video-taped to determine the level of improvement. Factorial ANOVA (3 groups x 2 trials) indicated significant within group pretest to posttest differences (F (1, 105) = 295.93, p<0.001). Between group differences were also noted (F, (2,105) = 18.33, p<0.001). Post hoc analysis indicated significantly fewer posttest deviations in the MV group than in the control group (p<0.001). The single-view group also had fewer posttest deviations than did the control group (p<0.001). There were no significant differences between the multi-view and single-view groups. The current study suggests that video modeling provided on a CD, which a learner can access on their own, may significantly increase skill acquisition rate and performance in learning the golf swing.

[pt] A dissertação tem como objetivo apresentar uma defesa do princípio de nãocontradição, uma defesa sustentada por dois argumentos. No primeiro argumento, coloca-se em destaque a relação entre a validade do princípio de não-contradição e a determinação do sentido das expressões linguísticas, em particular, a determinação do sentido dos termos gerais usados como predicados em frases singulares. Utilizar uma frase para dizer de um objeto que ele possui e, sob o mesmo aspecto, não possui uma mesma característica resultaria na indeterminação do sentido, a saber, que nada seria dado a entender pela frase. O segundo argumento pretende estabelecer uma relação entre uso de instâncias do princípio de não contradição e a capacidade de identificar objetos particulares. Para se referir determinadamente a um único particular, de tal maneira que seja possível pensar sobre este como sendo um sujeito de predicações, é preciso que se identifique esse particular através de um termo sortal e não simultaneamente através de um sortal oposto. Mais especificamente: tentar se referir a algo como sendo e não sendo de um certo tipo resultaria na indeterminação da referência, viz. não haveria identificação de um único objeto. / [en] The dissertation aims to present a defense of the principle of noncontradiction, a defense supported by two arguments. In the first argument, it is emphasized the relation between the validity of the principle of non-contradiction and the determination of the sense of linguistic expressions, in particular, the determination of the sense of general terms used as predicates in singular sentences. To say of an object that it has and, in the same respect, does not have a certain characteristic would result in the indetermination of sense, namely that nothing would be understood by the sentence. The second argument seeks to establish a relation between the use of instances of the principle of non-contradiction and the ability to identify particular objects. To refer specifically to a single individual, in such a way that it can be thought of as a subject of predication, it is necessary to identify this individual by means of a sortal term and not simultaneously through an opposite sortal. More precisely: trying to refer to a thing as being and not being of a certain sort would result in the indetermination of the reference, viz. no single object would be identified.