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We frame behavior in classical conditioning experiments as the product of normative statistical inference. According to this theory, animals learn an internal model of their environment from experience. The basic building blocks of this internal model are latent causes-explanatory constructs inferred by the animal that partition observations into coherent clusters. Generalization of conditioned responding from one cue to another arises from the animal's inference that the cues were generated by the same latent cause. Through a wide range of simulations, we demonstrate where the theory succeeds and where it fails as a general account of classical conditioning. 相似文献
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In this article, the authors analyze the popular search queries used in Google and Yahoo! over a 24-month period, January 2004–December 2005. They develop and employ a new methodology and metrics to examine and assess the digital divide in information uses, looking at the extent of political searches and their accuracy and variety. The findings indicate that some countries, particularly Germany, Russia, and Ireland, display greater accuracy of search terms, diversity of information uses, and sociopolitical concern. Also, in many English-speaking and Western countries most popular searches were about entertainment, implying a certain gap within these countries between the few who search for economic and political information and the many who do not. 相似文献
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This study explores the potential of an online platform that encourages journalists to post the documents behind their news stories to help restore the deteriorating public trust in news media. Based on content analysis of 200 news items and 315 accompanying documents posted on DocumentCloud, findings indicate that contrary to journalists’ traditional reluctance to rely on documents, the platform succeeds in boosting massive use of documents, both by mainstream and alternative journalists. Findings show that documents serve mainly to support factual claims (in 96 percent of items) and enhance the transparency of news processes, allowing audiences’ unmediated access to raw materials, and greater capacity to evaluate information independently. However, there are no apparent signs that journalists verified the content of the document. The article suggests that DocumentCloud is a unique example of a technology that may succeed where the former technology that promised to serve as a journalistic reference system, hyperlinks, had failed. If the DocumentCloud experiment is implemented on a wider scale, it might have serious theoretical and practical implications, which are discussed here. 相似文献
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Mark A. Boyer Scott W. Brown Michael J. Butler Anat Niv‐Solomon Brian Urlacher Natalie F. Hudson 《Globalisation, Societies & Education》2007,5(2):153-180
The appropriate role for the United Nations in international dispute resolution is a matter of high profile discussion and controversy. This paper begins with this ambivalence about the appropriate role for the United Nations in the world and examines several sets of issues that relate to the future of support for the UN within the US and the prospects for global governance more generally. First, we briefly review two thematic strands in previous and contemporary scholarship:(1) arguments for increased global governance in contemporary world affairs, driven by perceptions of the changing nature of the political, social, economic and military challenges in the contemporary world system. This debate is also put in the context of the relevance of public support for global governance institutions; and (2) why it is valuable to study how the current generation of adolescents perceive issues of global governance and the impact that their views may have on that nexus in the coming years. We then move to an analysis of data generated from an experimental study of American adolescents and their attitudes toward global governance. 相似文献
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