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101.
The Effect of Practice on Component Submovements is Dependent on the Availability of Visual Feedback
Participants (N = 16) were given extensive practice (1,500 trials) on a perceptual-motor aiming task. The full-vision (FV) group practiced with vision of their response cursor, whereas the no vision (NV) group practiced in a condition without vision. Movements were made as quickly and accurately as possible, and knowledge of results (KR) was provided. The authors tested the importance of vision early and late in practice by transferring participants to the NV condition without KR. The effects of practice differed between the two conditions. The FV group increased the speed of initial impulse to get to the target quickly, then relied on vision so make discrete error corrections. Transfer tests revealed that reliance on vision remained after extensive practice. For the NV group, practice effects were associated with a reduction in the extent to which discrete error corrections were produced. 相似文献
102.
The present authors tested the assumptions in R. S. Woodworth's (1899) 2-component model regarding the specific roles of vision in the production of both the initial impulse and the error-correction phases of movement. Participants (N = 40) practiced a rapid aiming task (1,500 trials), with either no visual feedback, vision of only the 1st 50% of the movement, vision of only the 1st 75% of the movement, or vision of the entire movement. Consistent with previous research, the availability of vision over the 1st half of the movement had no effect on aiming accuracy during acquisition. In contrast, when visual feedback was available over the 1st 75% of the movement and the entire movement, initial impulse endpoints were less variable and the efficiency of the error-correction phase was improved. Analysis of spatial variability at various stages in the movement revealed that participants processed visual feedback offline to improve programming of the initial impulse and processed it online in regulating the deceleration of the initial impulse. 相似文献
103.
The purpose of this paper is to explore the relationship between inclusive leadership, Leader-Member Exchange (LMX) and innovative work behavior (IWB) in employees of small capitalized textile firms of Pakistan. We hypothesized that LMX mediates the relationship between inclusive leadership and IWB. We collected data from 150 supervisors–subordinate dyads to test our hypotheses. We selected small capitalized firms because they are more innovative and change-oriented in order to enhance their innovativeness. Moreover, these firms enjoy the benefits of lack of bureaucracy and low resistance to change. Therefore, employees are better able to experience a close relationship with entrepreneurial leaders who tend to be inclusive, in order to facilitate the process of innovation. In line with these facts, our results also suggest that inclusive leadership is positively related with IWB and LMX partially mediates this relationship. The theoretical and practical implications of our findings are also discussed. 相似文献
104.
There are no official data on suicide from Pakistan, a conservative South Asian Islamic country with traditionally low suicide rates. Both suicide and attempted suicide are illegal acts, as well as socially and religiously condemned, making research in this area difficult. Recent reports suggest an increase in suicide rates. In this study, police data from the Sindh province were examined to provide a unique picture of trends of suicide over 15 years (1985-1999). During this period there were 2,568 reported suicides (71% men, 39% women; ratio 1.8). The lowest number was 90 in 1987 and maximum was 360 in 1999. Poisoning by organophosphates was the most common method followed by hanging. This study, although limited in scope, provides evidence of an increase in suicide rates in Pakistan, from one data source. There is urgent need for further research on suicide in Pakistan; interventions for suicide prevention in the country can then be planned. 相似文献
105.
Sussman ES Bregman AS Wang WJ Khan FJ 《Cognitive, affective & behavioral neuroscience》2005,5(1):93-110
In three experiments, we addressed the issue of attention effects on unattended sound processing when one auditory stream
is selected from three potential streams, creating a simple model of the cocktail party situation. We recorded event-related
brain potentials (ERPs) to determine the way in which unattended, task-irrelevant sounds were stored in auditory memory (i.e.,
as one integrated stream or as two distinct streams). Subjects were instructed to ignore all the sounds and attend to a visual
task or to selectively attend to a subset of the sounds and perform a task with the sounds (Experiments 1 and 2). A third
(behavioral) experiment was conducted to test whether global pattern violations (used in Experiments 1 and 2) were perceptible
when the sounds were segregated. We found that the mismatch negativity ERP component, an index of auditory change detection,
was evoked by infrequent pattern violations occurring in the unattended sounds when all the sounds were ignored, but not when
attention was focused on a subset of the sounds. The results demonstrate that multiple unattended sound streams can segregate
by frequency range but that selectively attending to a subset of the sounds can modify the extent to which the unattended
sounds are processed. These results are consistent with models in animal and human studies showing that attentional control
can limit the processing of unattended input in favor of attended sensory inputs, thereby facilitating the ability to achieve
behavioral goals. 相似文献
106.
Abrahim H. Khan 《Sophia》1994,33(3):74-88
This paper examines a political theory implict in Kierkegaard's critique of the novel Two Ages. To achieve that aim, it views
Kierkegaard as a political radical relative to modern liberalism and aristocratic conservatism of the 1840's in Denmark, by
juxtaposing him to Locke. Basic to the theory is a notion of individuality which relies on three interlocking concepts: will,
equality, and autonomy. That notion in turn supports ideas of authority and leadership that throw further light on Kierkegaard's
understanding of the relation between religion and politics and suggests what is central to the political logic operative
in the critique in his publication Literary Review. 相似文献
107.
The purpose of the experiments reported was to examine how novel, three-dimensional shapes are represented in long-term memory and how this might be differentially affected by monocular and binocular viewing. Three experiments were conducted. The first experiment established that slide projections of the novel objects could be recognized readily if seen in the same orientation as seen during learning. The second and third experiments examined generalization to novel depth rotations of the objects. The second experiment used slide projections of the objects. The results indicated that the representation of the objects seen during training was quite viewpoint-specific as recognition of objects in novel orientations was relatively poor. In the third experiment subjects were shown the real objects under monocular or binocular viewing. Overall, the results are consistent with a growing body of recent research showing that, at least under certain conditions, the visual system stores viewpoint-specific representations of objects. 相似文献
108.
109.
Lehman AK Elils B Becker J Rosenfarb I Devine R Khan A Reichler R 《Journal of personality assessment》1997,68(1):197-210
This study investigated the validity of Blatt's model of depression as indicated by his operational measure of its constructs via the Depressive Experiences Questionnaire (DEQ; Blatt, D'Afflitti, & Quinlan, 1976). Hypothesized relations between the two relevant scales of the DEQ and Tellegen's (1982) Multidimensional Personality Questionnaire, (MPQ) were examined, Participants consisted of 195 women, including 67 hospitalized unipolar depressives, 77 never-hospitalized unipolar depressives, and 51 nonpsychiatric controls. Overall, the results partially supported the validity of the DEQ even though all participants were women and prior studies have indicated the DEQ's greater discriminative validity for men than for women. However, several of the most strongly predicted relations, such as between DEQ Self-Criticism and MPQ Achievement were not confirmed. Coherent, significant relations between scales of the two measures remained after partialling out the effects of severity of depression. 相似文献
110.
The order of acquisition for 14 grammatical morphemes was studied in three children between MLU stages II and IV/V. Spontaneous language samples were recorded bimonthly in the children's homes for a period of 9 months. These samples were analyzed for correct use of the 14 morphemes, and the order of acquisition was compared to that reported by Brown (1973) for his three normal subjects. The correlation between the acquisition orders from the present study and the order from Brown's study was low, suggesting that the order of acquisition for these morphemes may not be invariant. 相似文献