排序方式： 共有33条查询结果，搜索用时 15 毫秒
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Edson M. Huziwara Saulo M. Velasco Gerson Y. Tomanari Deisy G. de Souza Armando D. Machado 《Learning & behavior》2013,41(2):192-204
In two experiments, we investigated emergent conditional relations in pigeons using a symbolic matching-to-sample task with temporal stimuli as the samples and hues as the comparisons. Both experiments comprised three phases. In Phase I, pigeons learned to choose a red keylight (R) but not a green keylight (G) after a 1-s signal. They also learned to choose G but not R after a 4-s signal. In Phase II, correct responding consisted of choosing a blue keylight (B) after a 4-s signal and a yellow keylight (Y) after a 16-s signal. Comparisons G and B were both related to the same 4-s sample, whereas comparisons R and Y had no common sample. In Phase III, R and G were presented as samples, and B and Y were presented as the comparisons. The choice of B was correct following G, and the choice of Y was correct following R. If a relation between comparisons that shared a common sample were to emerge, then responding to B given G would be more likely than responding to Y given R. The results were generally consistent with this prediction, suggesting, for the first time in pigeons, the emergence of novel relations that involve temporal stimuli as nodal samples. 相似文献
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Alfredo Salomão Filho Annelies Kamp 《Discourse: Studies in the Cultural Politics of Education》2019,40(1):122-135
ABSTRACTSocial capital is a puzzling actor; made real by its allies. It has been ‘out-there’ in the form of scientific publications for decades. Although some characteristics are common to all elaborations of this theory (networks, trust, and norms), there remains confusion in determining a ‘coherent concept’ of social capital. In this paper, we make use of such ‘incoherence gap’ to open an experimental theoretical and, subsequently, analytical space. Based on empirical research with mobile students and assemblages of non-human actors, the paper offers two investigative gatherings. First, the Bourdieusian approach to ‘social capital’ is discussed, allowing relational ontologies to enter the scene. Second, consideration is given to issues of performativity and the relevance of materiality for empirical social capital investigations. Despite the degree of ontological security social capital has managed to achieve, we question the disregard for the performative role of non-human entities in the context of global student mobility. 相似文献
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AbstractGrounded in achievement goal theory and self-determination theory, this cross-sectional study examined the relationship between perceived motivational climate and individuals’ motivation as well as the mediation effect of psychobiosocial states as conceptualised within the individual zones of optimal functioning (IZOF) model. Young students (N = 167, age range 14–15 years) taking part in physical education classes completed measures of teacher-initiated motivational climate, task and ego orientation, motivation and psychobiosocial states. Simple and serial mediation analyses indicated that a perceived mastery climate and individuals’ task orientation were related to intrinsic motivation and identified regulation through the mediation of pleasant/functional psychobiosocial states. In contrast, a perceived performance climate was related to external regulation and amotivation through the mediation of unpleasant/dysfunctional psychobiosocial states. Regression analysis results also showed that discrete psychobiosocial states accounted for a significant proportion of variance in motivational variables. Taken together, findings highlight the role of psychobiosocial states as mediators of the relationship between motivational climate and an individual’s motivation, and suggest that educators should consider a wide range of individual’s functional and dysfunctional reactions deriving from their instructional activity. 相似文献
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This article gives an overview of current provisions for environmental education in the context of distance education programmes in a sample of European countries. The methodology, that was employed by means of a postal survey aimed at identifying current trends in environmental education in relation to distance teaching, is described. The sample surveyed consisted of approximately 500 higher education institutions, members of the Association of European Universities (CRE), over 200 of which had signed the CRE‐Copernicus Universities Charter on Sustainable Development. The article presents a regional summary of the research findings that formed part of a larger enquiry into the status of environmental education in European countries, Commonwealth countries, and individual countries such as the United Kingdom and Pakistan. 相似文献
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Antonio Mauricio F.L. Miranda de S Danton D. Ferreira Edson W. Dias Eduardo M.A.M. Mendes Leonardo B. Felix 《Journal of The Franklin Institute》2009,346(9):841-853
The present work deals with recent results on the sampling distribution of the magnitude-squared coherence (also called just coherence) estimate between a random (Gaussian) and a periodic signal, in order to obtain analytical critical values, alternative expressions for the probability density function (PDF) as well as the variance and bias of the estimate. A comparison with the more general case of coherence estimation when both signals are Gaussian was also provided. The results indicate that the smaller the true coherence (TC) values the closer both distributions become. The behaviour of variance and bias as a function of the number of data segments and the TC is similar for both coherence estimates. Additionally, the effect of a normalizing function (Fisher's z transform) in the coherence estimated between a random and a periodic signal was also evaluated and normality has been nearly achieved. However, the variance was less equalized in comparison with coherence estimate between two Gaussian signals. 相似文献
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ABSTRACT This study examines whether professional journalists reason differently about moral problems when primed with their professional identity. This between-subjects experiment (N?=?171) used the Defining Issues Test, a much-used and validated instrument that measures moral reasoning. The results show identity priming does not affect how journalists apply ethics. The study also found that journalists score far lower in moral reasoning than they did 13 years ago. These results are interpreted through the lens of social identity theory. 相似文献
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Martin R. Kalfatovic Effie Kapsalis Katherine P. Spiess Anne Van Camp Michael Edson 《Archival Science》2008,8(4):267-277
The Flickr Commons was created as a forum for institutions to share their rich photographic collections with the emerging
Web 2.0 audience of Flickr; the Smithsonian Institution was the fourth member of the Commons. The Smithsonian effort was a
direct collaborative effort of the libraries, archives, museums, and information technology staff that generated new pathways
for collaboration between these units. As the world’s largest museum complex, these Smithsonian units serve as a microcosm
for collaboration in the information age. The Flickr Commons project provided insights into how the knowledge, skills, and
abilities of libraries, archives, and museums (LAM) can converge in the Web 2.0 environment to provide collection access to
new, and in some cases unknown, audiences. Simultaneously, by putting “LAM” content into an environment that allows for direct
interaction by these audiences, the knowledge of the content for holding institutions is enriched. By exposing Smithsonian
content within the Flickr environment, the Institution is learning what content is desired by the Web 2.0 world, how to bring
crowd-sourcing into professionally curated collections, and how to bring diverse institutional skills together in a collaborative
project. 相似文献
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This study, based on case studies of three online newsrooms, seeks to understand the patterns of how journalists use social media in their news work. Through 150 hours of observations and interviews with 31 journalists, the study found that journalists are normalizing social media while also reworking some of their norms and routines around it, a process of journalistic negotiation. They are balancing editorial autonomy and the other norms that have institutionalized journalism, on one hand, and the increasing influence exerted by the audience—perceived to be the key for journalism's survival—on the other. In doing so, journalists are also seeing a reworking of their traditional gatekeeping role, finding themselves having to also market the news. 相似文献
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Amanda M. George Alexsandra da Silva Bandeira Valter Cordeiro Barbosa Filho Linda E. Rohr Adair da Silva Lopes 《Journal of sports sciences》2019,37(5):500-506
This study evaluated whether the relationship between socioeconomic status (SES) and moderate-to-vigorous physical activity (MVPA) is mediated by social support of peers and parents. A cross-sectional study included students (n = 1182) aged 11 to 18 years who were recruited in 2014 from public schools in Fortaleza, Brazil. Participants completed a questionnaire to assess all variables. Mediation analyses were performed to determine the role of parental support and peer support on the relationship between SES and MVPA. Also, moderated-mediation analyses with estimating of conditional indirect effects were performed in order to identify whether gender is a moderator of the mediating effect. A positive and significant association between SES and MVPA was found among Brazilian students, and social support of parents and peers were significant mediators of this relationship. Conditional indirect effects showed that both parental and peer support had a significant indirect effect among boys; only parental support had a significant indirect effect among girls. These results suggest that improving social support can help reduce the impact of SES on physical activity among Brazilian adolescents. 相似文献