Instructor fluency leads to higher confidence in learning,but not better learning

Students’ judgements of their own learning often exceed their knowledge on a given topic. One source of this pervasive overconfidence is fluency, the perceived ease with which information is acquired. Though effects of fluency on metacognitive judgments have been explored by manipulating relatively simple stimuli such as font style, few studies have explored the effects of fluency on more complex forms of learning encountered in educational settings, such as learning from lectures. The present study manipulated the fluency of a 31-min video-recorded lecture, and measured its effects on both perceived and actual learning. In the fluent condition, the instructor used non-verbal gestures, voice dynamics, mobility about the space, and appropriate pauses. In the disfluent condition, the same instructor read directly from notes, hunched over a podium, rarely made eye contact, used few non-verbal gestures, spoke in monotone pitch, and took irregular and awkward pauses. Though participants rated the fluent instructor significantly higher than the disfluent instructor on measures of teaching effectiveness and estimated that they had learned more of the material, actual learning between the two groups did not differ as assessed by a memory test over the lecture contents given immediately (Experiment 1) or after a 1-day delay (Experiment 2). This counterintuitive result reveals an “illusion of learning” due to fluency in lecture-based learning, a very common form of instruction.     

Fast distributed algebraic connectivity estimation in large scale networks

This paper presents a distributed method to estimate the algebraic connectivity of fixed undirected communication graphs. The proposed algorithm uses bisection to estimate the second smallest eigenvalue of the Laplacian matrix associated to the graph. In order to decide the sub-interval in which the eigenvalue is contained, a distributed averaging algorithm based on Chebyshev polynomials is considered together with a max consensus algorithm. The information exchanged by neighbors in the graph each communication round is constant and independent of the size of the network, making it scalable to large networks. Besides, exploiting the convergence properties of Chebyshev polynomials we provide a direct estimation of the algebraic connectivity so that, instead of the midpoint of the bisection interval, the new approximation can be used. Finally, our algorithm also provides upper and lower bounds on the algebraic connectivity and an estimation of the Fiedler eigenvector associated to it. Simulations in large networks demonstrate the scalability and accuracy of the algorithm.     

Feel American,Watch American,Eat American? Remote Acculturation,TV, and Nutrition Among Adolescent–Mother Dyads in Jamaica

Globalization prompts remote acculturation toward U.S. culture in Jamaica; this study used a bioecological systems approach to examine its proximal impact on nutrition through U.S. cable TV consumption, and maternal influences in the home. Overall, 330 randomly selected adolescent–mother dyads from schools in Kingston, Jamaica (M_{adolescent_age} = 13.8 years, SD_{adolescent_age} = 1.8) completed questionnaires reporting American identity and behavioral preferences, daily time spent watching U.S.‐produced TV programs, and frequency of eating unhealthy foods. Actor–partner interdependence models revealed that girls’ American identity/behavior directly predicted their unhealthy eating, whereas girls’ mothers and boys’ American identity/behavior indirectly predicted unhealthy eating as mediated by their U.S. TV hours. Additionally, mothers’ American identity/behavior predicted daughters’ unhealthy eating as mediated by mothers’ U.S. TV hours. Remote acculturation theory may facilitate more targeted research and prevention/intervention.     

Development of the profession and qualifications of adult educators in Lithuania in the context of reforms of adult education

The Baltic countries regained their independence from the Soviet Union in the early 1990s and joined the European Union in 2004. This article seeks to explore institutional development and reforms of adult education and lifelong learning in Lithuania with respect to the processes, the actors and the context of socioeconomic change over the past 20 years. It also looks at the implications of these processes for the professionalisation of adult educators, referred to here as “adult learning teachers” (ALTs). The authors begin with an analysis of the historical-institutional and political-economical aspects of the development of adult education and lifelong learning by providing a retrospective of institutional change in Lithuania. They then move on to analyse the existing institutional and legal arrangements of adult education which shape and institutionalise the profession and qualifications of ALTs. Their empirical research reveals the opinions of Lithuanian ALTs on their current professional occupational profile and its future development.     

Relationships between employment quality and intention to quit: focus on PhD candidates as traditional workers

Current statistics show that the attrition rate among PhD candidates is high (i.e. from 30% to 40% depending on the discipline and the country). This high-attrition rate has an impact on both economic (e.g. negative impact on the return-on investment in doctoral education) and human levels (e.g. negative consequences on candidates’ self-esteem and well-being). Therefore, it seems important to better understand and to prevent the attrition among PhD candidates. Based on the needs–supplies fit theory, the present research focused on the perception of a fit between several PhD candidates’ work-related needs in terms of employment quality and the characteristics of their job to explain their intention to quit their PhD thesis process. This study was based on 160 Belgian PhD candidates, viewed as traditional workers in the Belgian doctoral system, who were still in their thesis process. Data were collected in one Belgian university. Globally, results shown that only the fit perception between the needs for fairness/recognition from the supervisor and the current job situation was significantly associated with lower intention to quit. Thus, we encourage Universities to develop and boost fairness and recognition from thesis supervisors through notably specific training programmes including supportive and justice-based practices.     

The present,past, and future of the gardening metaphor in education

Educators and educational theorists frequently employ a gardening metaphor to capture several child-centred principles about teaching and children, i.e. teachers must respect a child’s unique interests and abilities, recognise what is developmentally appropriate for students, and resist pursuing a narrow set of outcomes. Historically, however, educational theorists were as likely to use the gardening metaphor to support teacher-centred, ‘moulding’ ideals as they were to support child-centred ideals. Furthermore, in stark contrast to the contemporary optimism about a child’s innate, unique potential, the use of the gardening metaphor in the past sometimes supported prejudicial, deterministic views of children. In many ways, therefore, the contemporary use of the metaphor reflects genuine progress in educators’ ideas about children and their potential. Nevertheless, those who employ the gardening metaphor today might learn from some of its past users. Eager to avoid imposing their own goals on children, today child-centred gardeners have resisted articulating normative ideals by which teaching and parenting might be guided. Yet a normative ideal of the educated adult is not inconsistent with child-centred gardening.     

Information Systems: Problems of Image Registration and Reproduction

Due to the rapid development of visualization tools and technologies, the image information plays in the life of society a more and more large role in the course of time. There are widespread different image search and display systems which develop and could be integrated in various information systems. Long ago, many sections had been separated from the fundamental sphere of image information processing as independent directions with specific scientific objectives, such as computer graphics, computer vision, digital photography and others. The tendency to separation of new directions intended for different problems solving persists still, what is confirmed by the enormous annual number of publications. A wide variety of software products can meet the needs practically of any specific problem. But in present variety of image information processing it is possible to separate some general tendencies and some main central problems, which solving determines the image quality and the information systems operation evaluated by ultimate consumer.       

Simulation of Color Synthesis in Flexographic Printing

The realization of color conversions in accordance with the ICC technology is the basis of quality management in modern desktop publishing systems. An important point is that the result depends on the specific technological process, therefore the fine adjustment of the control systemis required. For such a multi-step process as flexographic printing is the reprofiling a complicated, labour-intensive and long procedure. The systems based on the ICC profiling, have several restrictions on use in flexographic printing. These restrictions are concerned mainly with the technologies of platemaking and printing processes, as well as with the usability of arbitrary quantity of printing inks, their combinations and with the need for color separation using in the autotype color synthesis of additive inks.       

Can Science Test Supernatural Worldviews?

Several prominent scientists, philosophers, and scientific institutions have argued that science cannot test supernatural worldviews on the grounds that (1) science presupposes a naturalistic worldview (Naturalism) or that (2) claims involving supernatural phenomena are inherently beyond the scope of scientific investigation. The present paper argues that these assumptions are questionable and that indeed science can test supernatural claims. While scientific evidence may ultimately support a naturalistic worldview, science does not presuppose Naturalism as an a priori commitment, and supernatural claims are amenable to scientific evaluation. This conclusion challenges the rationale behind a recent judicial ruling in the United States concerning the teaching of “Intelligent Design” in public schools as an alternative to evolution and the official statements of two major scientific institutions that exert a substantial influence on science educational policies in the United States. Given that science does have implications concerning the probable truth of supernatural worldviews, claims should not be excluded a priori from science education simply because they might be characterized as supernatural, paranormal, or religious. Rather, claims should be excluded from science education when the evidence does not support them, regardless of whether they are designated as ‘natural’ or ‘supernatural’.