Midsession reversals with pigeons: visual versus spatial discriminations and the intertrial interval     

Jennifer R. Laude  Jessica P. Stagner  Rebecca Rayburn-Reeves  Thomas R. Zentall 《Learning & behavior》2014,42(1):40-46

Discrimination reversal learning has been used as a measure of species flexibility in dealing with changes in reinforcement contingency. In the simultaneous-discrimination, midsession-reversal task, one stimulus (S1) is correct for the first half of the session, and the other stimulus (S2) is correct for the second half. After training, pigeons show a curious pattern of choices: They begin to respond to S2 well before the reversal point (i.e., they make anticipatory errors), and they continue to respond to S1 well after the reversal (i.e., they make perseverative errors). That is, pigeons appear to be using the passage of time or the number of trials into the session as a cue to reverse, and are less sensitive to the feedback at the point of reversal. To determine whether the nature of the discrimination or a failure of memory for the stimulus chosen on the preceding trial contributed to the pigeons’ less-than-optimal performance, we manipulated the nature of the discrimination (spatial or visual) and the duration of the intertrial interval (5.0 or 1.5 s), in order to determine the conditions under which pigeons would show efficient reversal learning. The major finding was that only when the discrimination was spatial and the intertrial interval was short did the pigeons perform optimally.  相似文献   

Convergence,connectivity, ephemeral and performed: new characteristics of digital photographs     

Jessica Bushey 《档案与原稿》2014,42(1):33-47

The recent convergence of digital cameras into mobile phones with Internet connectivity has provided the opportunity for individuals and organisations to adopt new image-making practices. The widespread use of photo-sharing and social networking platforms for sharing, accessing and storing digital photographs is presenting scholars in the social sciences with new areas of research that address the nature of digital photography. By examining the technological, social and cultural factors involved in contemporary image-making practices, scholars are presenting new concepts regarding the characteristics of digital photographs that impact archival activities aimed at managing and preserving trustworthy digital records. This article identifies and discusses the key concepts emerging from social science research on digital photography that are most relevant to the archival field. Analysis of the findings of these studies suggests that new technologies and social practices are changing how people use digital photographs and their expectations of permanence. Therefore, archivists need to be engaged in interdisciplinary discussions regarding the evolution of photographic practices and emerging characteristics of digital photographs in order to anticipate the management and preservation activities required to protect contemporary visual records for future use.  相似文献   

Use and Perceptions of E-books by Academic Staff in Further Education     

Elaine Mulholland  Jessica Bates 《The Journal of Academic Librarianship》2014,40(5):492-499

This article reports on a study of the awareness, perceptions and use of e-books by academic staff in Further Education (FE) colleges throughout Northern Ireland (NI). It is the first comprehensive study of e-book use by FE faculty in NI and fills a significant gap in the research literature on e-books in education, which has tended to focus on Higher Education and the university setting. Data was collected through an online survey which was distributed to FE faculty across NI. The findings show that although FE academic staff are receptive to e-books and welcome them as a resource, poor reading experience and lack of awareness of relevant titles have had an impact. In particular, the research found that 40% of academic staff, in post less than five years, had not used e-books. Greater availability of titles, promotion, and better integration within teaching and learning emerge as key requisites for effective service delivery and enhancement of e-books within FE, as does the need for better targeted instruction and training aimed at academic staff. Understanding patrons' views, awareness, needs, habits and expectations in relation to e-books is crucial to help direct collection content while budgets remain tight and physical space limited.  相似文献   

Handbook of data processing for libraries: Robert M. Hayes and Joseph Becker. Melville Publishing Co., Los Angeles,Calif., 1974 2nd edn, 685 pp     

Jessica L. Harris 《Information processing & management》1976,12(4):294-295

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Active transportation to school: findings from a national survey     

Fulton JE  Shisler JL  Yore MM  Caspersen CJ 《Research quarterly for exercise and sport》2005,76(3):352-357

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God does not play dice: causal determinism and preschoolers' causal inferences     

Schulz LE  Sommerville J 《Child development》2006,77(2):427-442

Three studies investigated children's belief in causal determinism. If children are determinists, they should infer unobserved causes whenever observed causes appear to act stochastically. In Experiment 1, 4-year-olds saw a stochastic generative cause and inferred the existence of an unobserved inhibitory cause. Children traded off inferences about the presence of unobserved inhibitory causes and the absence of unobserved generative causes. In Experiment 2, 4-year-olds used the pattern of indeterminacy to decide whether unobserved variables were generative or inhibitory. Experiment 3 suggested that children (4 years old) resist believing that direct causes can act stochastically, although they accept that events can be stochastically associated. Children's deterministic assumptions seem to support inferences not obtainable from other cues.  相似文献   

Event-Konzepte     

Ronald Hitzler  Babette Kirchner  Jessica Pahl 《Zeitschrift für Erziehungswissenschaft》2013,16(3):143-158

In view of processes of individualization and pluralization, the requirements for living in modern societies result in significantly increased complexity of social constructions of reality. Especially for individualized juvenile people new forms of communities are a constitutive feature of social lifestyle progression and rearrangement. Within events a specific type of these juvenile communalities emerges. Based on two different cases, a music festival and an improvisational theater performance, this paper emphasizes a crucial similarity of events: the use of (physical) staging as a social mechanism for integration and distinction. The process of ‘eventization’ (i.e., spectacularization) provides a framework for action, in which emotional as well as mental affiliations constitute.  相似文献   

Engaging Girls’ Sociohistorical Identities in Science     

Jessica Thompson 《学习科学杂志》2013,22(3):392-446

What does it mean for ethnic minority girls, who have historically been marginalized by schools, to “see themselves” in science? Schools fail to create spaces for students to engage their identity resources in the learning of science or to negotiate and enact new science-related identities. This study investigates relationships among identity, engagement, and science discourse and provides a conceptual argument for how and why underserved ethnic minority girls engage in collective identity work, with science learning as a valued byproduct. The primary context for the study was Lunchtime Science, a 4-week lunchtime intervention for girls failing their science courses. There were 4 distinct ways the girls engaged in learning during Lunchtime Science: gleaning content for outside worlds, supporting the group, negotiating stories across worlds, and critiquing science. Each pattern had a signature profile with variations in the sociohistorical narratives used as resources, the positioning of one another as competent learners, and the type of science story critiqued and constructed. These findings indicate that when the girls were given opportunities to engage their personal narratives, and when science was open to critique, ethnic minority girls leveraged common historical narratives to build science narratives. Moreover, the girls’ identity work problematizes the commonplace instructional notion of “bridging” students’ everyday stories with science stories, which often privileges the science story and the composing of “science” identities. It also challenges researchers to investigate how the construction of narratives is broader than 1 community of practice, broader than 1 individual, and broader than 1 generation.  相似文献   

Missing the Mark: The Neglect of Stalking and Cyberstalking in Introductory Criminology Textbooks     

Jessica Huffman  Angela Overton 《Journal of Criminal Justice Education》2013,24(2):200-217

Textbooks are an essential component of student education, often forming the basis for all information presented in a given class. Introductory texts cannot possibly cover all relevant material, but what is included speaks volumes. Given the prevalence of stalking and cyberstalking in society, this is an important issue for inclusion in introductory criminology and criminal justice classes. An analysis of 20 criminology and 12 criminal justice textbooks is done to determine what students are learning about this prevalent social problem. Specifically, we aim to evaluate whether stalking and cyberstalking are covered, determine the theories associated with the issues, and assess the textbook location in which the issue is covered. Results indicate slight coverage of stalking and cyberstalking in introductory texts.  相似文献   

Knowledge Orientations of Prospective Early Childhood Teachers: A Study of Students' Scientific Versus Subjective Orientations in Teacher Education Courses in Germany     

Christoph Mischo  Stefan Wahl  Janina Strohmer  Jessica Hendler 《Journal of Early Childhood Teacher Education》2013,34(2):144-162

Recent changes in the system of early childhood teacher education in Germany raise the question of whether different academic levels of early childhood teacher education lead to different beliefs and orientations. In this study, prospective early childhood teachers' orientations to scientific knowledge and to research were explored. A questionnaire addressing orientations to the utility of research, educational and psychological theories versus orientations to intuitive theories and personal experience was completed by 712 prospective early childhood teachers. In a latent profile analysis, two types of orientation profiles could be identified: (a) an orientation towards subjective theories, lay theories, and subjective experience, and (b) an orientation towards scientific theories and research results. Results are discussed from the perspective of professionalization in early childhood teacher education.  相似文献