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1.
W Bains 《Science (New York, N.Y.)》2012,337(6099):1173; author reply 1173
Grainger et al. (Reports, 13 April 2012, p. 245) suggest that baboons can discriminate words from nonwords on the basis of two-letter (bigram) frequencies. This ability can also be attributed to baboons being able to recognize specific letters (i.e., shapes) in specific positions in their four-letter words, without reference to letter or bigram frequencies. 相似文献
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Activation of extrastriate and frontal cortical areas by visual words and word-like stimuli 总被引:33,自引:0,他引:33
Visual presentation of words activates extrastriate regions of the occipital lobes of the brain. When analyzed by positron emission tomography (PET), certain areas in the left, medial extrastriate visual cortex were activated by visually presented pseudowords that obey English spelling rules, as well as by actual words. These areas were not activated by nonsense strings of letters or letter-like forms. Thus visual word form computations are based on learned distinctions between words and nonwords. In addition, during passive presentation of words, but not pseudowords, activation occurred in a left frontal area that is related to semantic processing. These findings support distinctions made in cognitive psychology and computational modeling between high-level visual and semantic computations on single words and describe the anatomy that may underlie these distinctions. 相似文献
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People often are unable to report the content of ignored information, but it is unknown whether this reflects a complete failure to perceive it (inattentional blindness) or merely that it is rapidly forgotten (inattentional amnesia). Here functional imaging is used to address this issue by measuring brain activity for unattended words. When attention is fully engaged with other material, the brain no longer differentiates between meaningful words and random letters, even when they are looked at directly. These results demonstrate true inattentional blindness for words and show that visual recognition wholly depends on attention even for highly familiar and meaningful stimuli at the center of gaze. 相似文献
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SENDERS JW 《Science (New York, N.Y.)》1963,141(3585):1067-1068
Three calculations of the number of different things stored in the world's libraries yield estimates from 7.5 x 10(7) to 7.7 x 10(8). At 10(5) words per volume, five letters per word, and 12 bits per letter, the information capacity used for storage is between 4.6 x 10(14) and 4.6 x 10(15) bits, and is increasing at about 2 x 10(6) bits per second. 相似文献
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低空林地航拍图像拼接的改进缝合线算法 总被引:1,自引:0,他引:1
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Children of three ages were compared with adults in a recognition experiment requiring continuous processing of information. The growth in precision for visually presented words is steeper than for auditorially presented words, largely because the former are harder for the first graders and, to a lesser extent, for the third graders. In adults, visual processing of information is at least as good as auditory. The use of receiver operating characteristic curves in describing the data permit greater precision in estimating the capacity of the individual subjects and are particularly useful since the errors of failure to recognize were different from ordinary errors of false recognition, and they occurred in large numbers. 相似文献
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Effects of thiopental sedation on learning and memory 总被引:1,自引:0,他引:1
A G Osborn J P Bunker L M Cooper G S Frank E R Hilgard 《Science (New York, N.Y.)》1967,157(788):574-576
Subjects who were administered thiopental showed a loss of memory for events discussed while they were under sedation. We tested the subjects for recognition memory of pictures and recall of associated pairs of letters and words, and found that the subsequent memory loss was correlated with the concentration of thiopental in the venous blood at the time the material was learned. Retention did not appear to be state-dependent because the subject, while under sedation, could recall material learned prior to sedation, and because recall was not facilitated by reinstatement of the sedation. 相似文献
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Humans routinely classify others according to both their individual attributes, such as social status or wealth, and membership in higher order groups, such as families or castes. They also recognize that people's individual attributes may be influenced and regulated by their group affiliations. It is not known whether such rule-governed, hierarchical classifications are specific to humans or might also occur in nonlinguistic species. Here we show that baboons recognize that a dominance hierarchy can be subdivided into family groups. In playback experiments, baboons respond more strongly to call sequences mimicking dominance rank reversals between families than within families, indicating that they classify others simultaneously according to both individual rank and kinship. The selective pressures imposed by complex societies may therefore have favored cognitive skills that constitute an evolutionary precursor to some components of human cognition. 相似文献
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信息时代下,苹果产业的"资源仓库"是科技发展的重要保障。为了实现资源的深层次利用,就必须对其进行整合。以我国现有的苹果数据库、数据平台、网站、实体机构及纸质文献为数据源来构建数据库,包括生产数据库、种质资源数据库、育种数据库、栽培数据库、采后加工数据库、产业经济数据库、基础数据库、叙词库9个部分。通过知识抽取、标引和关联构建来实现数据的深加工和整合,形成新的知识库后将知识产品输出可以提供基于数据整合的相关服务。基于架构设计进行本地测试,通过具体案例演示证明和实现了我国苹果产业数据资源分布的分析、相关检索词整合和高频词整合。基于检索词进行检索后可以实现以其为中心的数据整合和知识整合,展示出知识之间的关联,挖掘出数据间的多维度知识关联关系。苹果产业科学数据整合的框架设计,可以将我国苹果产业多源化、多类型的数据融合到一起,打通数据之间的关联关系,使各类数据交织渗透。数据经过整合后可以提供更深层次的知识服务,减少了获取数据的知识成本。 相似文献
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提高科技论文关键词标引质量的探讨 总被引:1,自引:0,他引:1
吴立志 《农业图书情报学刊》2010,22(9):210-211,215
在参考前人研究成果的基础上,结合我国相关标准和规范,对关键词的标引方法进行了讨论,认为关键词的标引主要是受控标引,但允许自由词的存在,其标引步骤为:论文审读→主题分析→抽词→规范化处理→标引结果审核。重点叙述了科技论文主题分析和主题词抽词技术,探讨了如何提高关键词的标引质量:科技论文主题分析要全面、规范化处理抽取的主题词,控制自由词数量。 相似文献
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This paper selected the corn processing industry technology innovation alliance in Heilongjiang Province as the research object, evaluated the operational performance of the alliance by using analytic hierarchy process (AHP) and fuzzy comprehensive evaluation methods. AHP empirical results showed that the satisfaction of information communication and the satisfaction of the management process were the weakest. And the order from high to low on the level of indicators of the impact for the alliance was the result of alliance operations and the process of alliance operations, the behavioral attitude of alliance members. Besides, the results of fuzzy comprehensive evaluation showed that the operational performance of the corn processing industry technology innovation alliance in Heilongjiang Province was in the general level. 相似文献
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这一组文章根据一次讨论发言写成。几名硕士研究生对近年来引起了社会广泛关注的汉语运用方而存在的问题进行调查、分析,大体上说出了这方而的主要问题:念错字,用字母标注商标存在某些混乱现象;不明词语的意义和语法功能造成词语使用不当;随意搭配词语;某些汉译作品中存在着一些语法或修辞方面的毛病。经过讨论,共同的着法是,出现这
些问题的根本原因一是语言学习不够、教育不够;二是有些人社会责任感不强。因此,呼吁加强汉语学习,要以高度的社会责任感对待汉语运用问题。 相似文献
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刘正初 《中国农业科技导报》2013,15(5):17-23
为了阐明生物制剂在草本纤维质农产品加工业中应用的研究范围与进展,采用系统信息学技术原理,围绕生物制剂在脱胶、纺织、造纸、轻工制造等学科领域中应用的主线,对近40年的相关研究报道进行分类整理与凝练。分析结果表明,在草本纤维原料脱胶及其类似初级加工过程中应用菌制剂具有节能、减排、降耗、高效利用资源等优点;在草本纤维纺织、造纸、轻工制造等深加工领域里应用酶制剂可以充分发挥酶的专一性、高效性作用,说明生物制剂在草本纤维质农产品加工业中应用的前景十分广阔。 相似文献
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Culliton BJ 《Science (New York, N.Y.)》1983,220(4601):1029
Letters from John Darsee and two Emory University faculty members with whom he co-authored papers will appear in the 9 June 1983 issue of the New England Journal of Medicine. The letters will retract articles containing inaccurate and fabricated information that were published by the journal in 1979 and 1981. Darsee's letter of apology will clear his co-authors of any responsibility for the inaccuracies. 相似文献
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为了合理利用电子资源为科研工作服务,就提高信息检索效率的方法进行了探讨,认为合理选择数据资源,选择合适的检索词,合理运用检索规则调整检索范围等是提高检索效率的有效方法。 相似文献
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分别选择浑善达克沙地西部、中部和腹地3个区域,利用遥感影像的假彩色合成、比值增强、归一化植被指数(NDVD、掩膜技术等遥感图像增强处理技术,对3个区域进行遥感数字图像处理,探讨增强草原沙漠化信息的有效方法。研究发现:NDVI图像中,不同级别的草原沙漠化在灰阶上易于区分,尤其是轻度沙漠化和重度沙漠化,反差非常大;TM3/TM4比值运算增强了沙漠化信息,特别是半固定沙地的信息,再与原图像中的TM4和TM5进行假彩色合成,形成含有比值运算信息的合成图像,更加突出了草原中度沙漠化的信息。 相似文献
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郭立琴 《山西农业大学学报(自然科学版)》2001,21(4):384-385
英语短语from…to…可以和表示时间、地点、次序、地位、价格、年龄、数字、重量等不同意义的词连用 ,表示从一起点到一终点。本文就其后所接之词的异同进行了总结 相似文献
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以洋常春藤叶片为材料,采用同源RT–PCR方法,克隆获得了洋常春藤法呢基焦磷酸合成酶基因,其c DNA序列大小为1 050 bp,开放阅读框为1 026 bp,推测编码342个氨基酸残基,该序列的核苷酸、氨基酸与五加科植物有同源性;用在线数据软件进行分析,推测该蛋白可能存在于细胞质之中,定位在细胞膜外,FPS蛋白的相对分子质量为39 735.7;该蛋白含有2个天冬氨酸保守结构域,其二级结构主要以α螺旋和无规则卷曲为主;双子叶植物系统进化树分析结果表明,洋常春藤的FPS与刺五加、人参、三七、西洋参、辽东楤木的FPS亲缘关系最近,这一结果符合传统的分类法规则。 相似文献