Effectiveness of Multimedia Pedagogical Agents Predicted by Diverse Theories: a Meta-Analysis     

Castro-Alonso  Juan C.  Wong  Rachel M.  Adesope  Olusola O.  Paas  Fred 《Educational Psychology Review》2021,33(3):989-1015

Multimedia pedagogical agents are on-screen characters that allow users to navigate or learn in multimedia environments. Several agents’ characteristics may moderate their instructional effectiveness, including appearance, gender, nonverbal communication, motion, and voice. Here, we conducted a meta-analysis to test hypotheses from diverse theories predicting the effects of these agents’ characteristics. We tested predictions of cognitive load theory, cognitive theory of multimedia learning, computers are social actors, social agency theory, uncanny valley, and the action observation network. Our meta-analysis of 32 effect sizes (N?=?2104) revealed a small overall effect (g+?=?0.20), showing that learning with multimedia pedagogical agents was more effective than learning without these agents. As predicted by the redundancy effect of cognitive load theory and the coherence principle of cognitive theory of multimedia learning, 2D agents (g+?=?0.38) tended to be more effective than 3D agents (g+?=?0.11). As predicted by the computers are social actors hypothesis, most of the agents’ characteristics, including nonverbal communication, motion, and voice, appeared not to moderate their effectiveness. We conclude that multimedia pedagogical agents help learning through multimedia, and that students may be able to learn similarly from different types of agents.

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Evaluating computer-generated domain-oriented vocabularies     

Fred J. Damerau 《Information processing & management》1990,26(6)

It is generally accepted that natural language understanding systems are not now able to deal successfully with unrestricted text, except in very superficial ways. Certainly no current NL system exhibits any significant degree of understanding over arbitrary subject matter. Moreover, there is no convincing reason to believe this situation will change in the near future. Successful systems, therefore, have been restricted to specific applications in particular discourse domains. In those situations where users are expected to provide the domain vocabulary (e.g., TEAM, TQA, etc.) it would be very desirable to provide at least suggestions as to what this vocabulary might be, because a good part of the difficulty in customizing a general system consists of supplying the domain vocabulary and specifying its grammatical properties. This paper discusses some methods for identifying domain vocabulary, as well as techniques for evaluating the quality of the resulting word list.  相似文献   

Einstein, race, and the myth of the cultural icon     

Jerome F 《Isis; an international review devoted to the history of science and its cultural influences》2004,95(4):627-639

The most remarkable aspect of Einstein's 1946 address at Lincoln University is that it has vanished from Einstein's recorded history. Its disappearance into a historical black hole symbolizes what seems to happen in the creation of a cultural icon. It is but one of many political statements by Einstein to have met such a fate, though his civil rights activism is most glaringly missing. One explanation for this historical amnesia is that those who shape our official memories felt that Einstein's "controversial" friends like Paul Robeson and activities like co-chairing the anti-lynching crusade might tarnish Einstein as an icon. That icon, sanctified by Time magazine when it dubbed Einstein "Person of the Century" at the end of 1999, is a myth, albeit a marvelous one. Yet it is not so much the motive for the omission but the consequence of it that should concern us. Americans and the millions of Einstein fans around the world are left unaware that he was an outspoken, passionate, committed antiracist.  相似文献   

The emergence of China as a leading nation in science   总被引：4，自引：0，他引：4  

Ping Zhou  Loet Leydesdorff 《Research Policy》2006,35(1):83-104

China has become the fifth leading nation in terms of its share of the world's scientific publications. The citation rate of papers with a Chinese address for the corresponding author also exhibits exponential growth. More specifically, China has become a major player in critical technologies like nanotechnology. Although it is difficult to delineate nanoscience and nanotechnology, we show that China has recently achieved a position second only to that of the USA. Funding for R&D has been growing exponentially, but since 1997 even more in terms of business expenditure than in terms of government expenditure. It seems that the Chinese government has effectively used the public-sector research potential to boost the knowledge-based economy of the country. Thus, China may be achieving the (“Lisbon”) objectives of the transition to a knowledge-based economy more broadly and rapidly than its western counterparts. Because of the sustained increase in Chinese government funding and the virtually unlimited reservoir of highly skilled human resources, one may expect a continuation of this growth pattern in the near future.  相似文献   

Preschool Children’s Foreign Language Vocabulary Learning by Embodying Words Through Physical Activity and Gesturing     

Konstantina Toumpaniari  Sofie Loyens  Myrto-Foteini Mavilidi  Fred Paas 《Educational Psychology Review》2015,27(3):445-456

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A Digest of Listservs of Interest to Access Services,March–May 2015     

Fred W. Smith 《Journal Of Access Services》2015,12(3-4):128-131

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Erratum to: Effects of spell checkers on English as a second language students’ incidental spelling learning: a cognitive load perspective     

Po-Han Lin  Tzu-Chien Liu  Fred Paas 《Reading and writing》2017,30(7):1527-1528

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An Essay: Reflecting on Your Laurels     

Fred Nickols 《Performance Improvement》2015,54(3):6-8

We all know we are not supposed to rest on our laurels but there is great benefit to be had from reflecting on them. This essay lays out a tool known as The Goals Grid. It can be used to examine how you got to where you are and to set directions for where you want to go from here. Its four quadrants—Achieve, Preserve, Avoid, and Eliminate—will accommodate all goals and objectives.  相似文献   

The semantic mapping of words and co-words in contexts     

Loet Leydesdorff  Kasper Welbers 《Journal of Informetrics》2011,5(3):469-475

Meaning can be generated when information is related at a systemic level. Such a system can be an observer, but also a discourse, for example, operationalized as a set of documents. The measurement of semantics as similarity in patterns (correlations) and latent variables (factor analysis) has been enhanced by computer techniques and the use of statistics; for example, in “latent semantic analysis”. This communication provides an introduction, an example, pointers to relevant software, and summarizes the choices that can be made by the analyst. Visualization (“semantic mapping”) is thus made more accessible.  相似文献   

Children's ideas about the reliability of experimental data     

Fred Lubben  Robin Millar 《International Journal of Science Education》2013,35(8):955-968

This paper reports some of the findings of the Procedural and Conceptual Knowledge in Science (PACKS) project. It documents children's ides about the reliability of experimental data, an important element of their understanding of science procedures. These ideas were elicited using a written survey instrument completed by over 1000 students aged 11, 14 and 16, chosen to be representative of the full ability range. The results show progression with age in understanding of empirical data. A range of ideas about the function of repeat measurements, how to handle repeat measurements and anomalous readings, and the significance of the spread of a set of repeated measurements emerge and are discussed.  相似文献