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71.
Pigeons and adult humans searched for a 2-cm2 unmarked goal in digitized images of an outdoor scene presented on a touch-screen monitor. In Experiment 1, the scene contained three landmarks near the goal and a visually rich background. Six training images presented the scene from different viewing directions and distances. Subsequent unreinforced tests in which landmark or background cues were removed or shifted revealed that pigeons’ search was controlled by both proximal landmarks and background cues, whereas humans relied only on the proximal landmarks. Pigeons’ search accuracy dropped substantially when they were presented with novel views of the same scene, whereas humans showed perfect transfer to novel views. In Experiment 2, pigeons with previous outdoor experience and humans were trained with 28 views of an outdoor scene. Both pigeons and humans transferred well to novel views of the scene. This positive transfer suggests that, under some conditions, pigeons, like humans, may encode the three-dimensional spatial information in images of a scene. 相似文献
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URI和数字对象唯一标识符* 总被引:10,自引:0,他引:10
数字对象唯一标识符作为数字图书馆的基础设施,具备网络环境下数字对象的标识、定位、管理等多种职能。本文分析了唯一标识符的类型、组成和构造原则,从逻辑标识、命名域相关、复杂性、完整性和互操作等角度论述唯一标识符的需求。在W3C提供的URI背景下,比较URI、URL和URN,并分析了相关命名语法和标识框架。最后介绍了COOL URL的概念和命名需求。 相似文献
75.
Emotional and Behavioral Predictors of Preschool Peer Ratings 总被引:11,自引:0,他引:11
Susanne A. Denham Marcia McKinley Elizabeth A. Couchoud Robert Holt 《Child development》1990,61(4):1145-1152
It was predicted that social cognitive, behavioral, and affective aspects of young children's social development would predict stable peer ratings of their likability. Measures of likability, emotion knowledge, prosocial and aggressive behavior, peer competence, and expressed emotions (happy and angry) were obtained for 65 subjects (mean age = 44 months). Sociometric ratings, particularly negative, were stable over 1- and 9-month time periods. Correlational analyses showed that emotion knowledge and prosocial behavior were direct predictors of likability. Prosocial behavior mediated the relations of gender and expressed emotions with likability (i.e., gender and expressed emotions were each related to prosocial behavior, and prosocial behavior was related to likability, but neither gender nor expressed emotions were related to likability with prosocial behavior partialled out). Knowledge of emotional situations similarly mediated the age-likability relation. Results uphold the early development of stable peer reputations and the hypothesized centrality of emotion-related predictors of likability. 相似文献
76.
Feldman HM Dale PS Campbell TF Colborn DK Kurs-Lasky M Rockette HE Paradise JL 《Child development》2005,76(4):856-868
The MacArthur-Bates Communicative Development Inventories (CDI; Dale, 1996; Fenson et al., 1994), parent reports about language skills, are being used increasingly in studies of theoretical and public health importance. This study (N = 113) correlated scores on the CDI at ages 2 and 3 years with scores at age 3 years on tests of cognition and receptive language and measures from parent-child conversation. Associations indicated reasonable concurrent and predictive validity. The findings suggest that satisfactory vocabulary scores at age 2 are likely to predict normal language skills at age 3, although some children with limited skills at age 3 will have had satisfactory scores at age 2. Many children with poor vocabulary scores at 2 will have normal skills at 3. 相似文献
77.
The traditional approach to the education of language minority students separates English language development from content instruction because it is assumed that English language proficiency is a prerequisite for subject matter learning. The authors of this article take the alternate view that the integration of inquiry science and language acquisition enhances learning in both domains. The report describes a conceptual framework for science–language integration and the development of a five‐level rubric to assess teachers' understanding of curricular integration. The science–language integration rubric describes the growth of teacher expertise as a continuum from a view of science and language as discreet unrelated domains to the recognition of the superordinate processes that create a synergistic relationship between inquiry science and language development. Examples from teacher interviews are used to illustrate teacher thinking at each level. © 2002 Wiley Periodicals, Inc. J Res Sci Teach 39: 664–687, 2002 相似文献
78.
Two experiments tested blocking in landmark-based search in honeybees. Honeybees in the experimental group were trained in Phase 1 with a single landmark in a constant spatial relation to the target (sugar water). In the compound training second phase, the landmark used in Phase 1 (blocking landmark) and a new landmark (blocked landmark) were presented at constant spatial relations to the target. The blocking and blocked landmarks differed from each other in color and position, and the blocking landmark retained the same spatial relationship to the target as in Phase 1. In Experiment 1, the control group experienced only Phase 2 training with two landmarks. In Experiment 2, the control group was trained with a different landmark in a different position in Phase 1. Blocking was found in both cases. 相似文献
79.
Tuchman AM 《Isis; an international review devoted to the history of science and its cultural influences》2004,95(1):34-57
Marie E. Zakrzewska (1829-1902) is known among historians of women and medicine for her advocacy of the natural sciences at a time when most women physicians preferred to emphasize their nurturing qualities. This article suggests that Zakrzewska's views have been poorly understood because scholars have tried to position them along a fault line that divides femininity and sympathy from masculinity and science. It suggests instead that feminist scholarship on the "situatedness of gender" offers a more promising conceptual framework for understanding the diverse strategies women (and men) have utilized in trying to achieve their goals. Zakrzewska, unlike many of her colleagues, did not seek to empower feminine virtues as a way of justifying women's entry into the medical profession. Instead, she tried to reappropriate science for women and to use it as a weapon against the barriers designed to keep women out of the public sphere. She was fighting her own battle against the gendering of science. 相似文献
80.
Computer-mediated discussion lists, or list-servers, are popular tools in settings ranging from professional to personal to educational. A discussion list on genetically modified food (GMF) was created in September 2000 as part of the Forum on Genetically Modified Food developed by Science Controversies: Online Partnerships in Education (SCOPE), an educational project that uses computer resources to aid research and learning around unresolved scientific questions. The discussion list "GMF-Science" was actively supported from January 2001 to May 2002. The GMF-Science list welcomed anyone interested in discussing the controversies surrounding GMF. Here, we analyze the dynamics of the discussions and how the GMF-Science list may contribute to learning. Activity on the GMF-Science discussion list reflected some but not all the controversies that were appearing in more traditional publication formats, broached other topics not well represented in the published literature, and tended to leave undiscussed the more technical research developments. 相似文献