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121.
Updating egocentric representations in human navigation 总被引:20,自引:0,他引:20
Seven experiments tested whether human navigation depends on enduring representations, or on momentary egocentric representations that are updated as one moves. Human subjects pointed to unseen targets, either while remaining oriented or after they had been disoriented by self-rotation. Disorientation reduced not only the absolute accuracy of pointing to all objects ('heading error') but also the relative accuracy of pointing to different objects ('configuration error'). A single light providing a directional cue reduced both heading and configuration errors if it was present throughout the experiment. If the light was present during learning and test but absent during the disorientation procedure, however, subjects showed low heading errors (indicating that they reoriented by the light) but high configuration errors (indicating that they failed to retrieve an accurate cognitive map of their surroundings). These findings provide evidence that object locations are represented egocentrically. Nevertheless, disorientation had little effect on the coherence of pointing to different room corners, suggesting both (a) that the disorientation effect on representations of object locations is not due to the experimental paradigm and (b) that room geometry is captured by an enduring representation. These findings cast doubt on the view that accurate navigation depends primarily on an enduring, observer-free cognitive map, for humans construct such a representation of extended surfaces but not of objects. Like insects, humans represent the egocentric distances and directions of objects and continuously update these representations as they move. The principal evolutionary advance in animal navigation may concern the number of unseen targets whose egocentric directions and distances can be represented and updated simultaneously, rather than a qualitative shift in navigation toward reliance on an allocentric map. 相似文献
122.
Xiaochao Wang 《Frontiers of Philosophy in China》2006,1(2):317-323
Since the “Conference on Foreign Philosophy” held in Wuhu in October 1978, the study of foreign philosophy in China has undergone
a prosperous stage. This article discusses the significance of the study of foreign philosophy in the context of renovation,
transformation and remolding of Chinese contemporary culture, explores the role of the discipline in the context of Chinese
cultural construction, and anticipates the future of this discipline. A cross-cultural perspective is needed for a proper
understanding of the significance of the learning and study of foreign philosophy in Chinese cultural construction; otherwise
we might fall into cultural conservationism. Secondly, to make philosophy and social sciences prosperous is also a task for
foreign philosophy studies, and whether or not foreign philosophy can be well studied should be a mark of the prosperousness
of the construction of Chinese culture. Finally, philosophy is a product of human beings and should eventually serve human
beings. Chinese culture should open itself up to the world and so should foreign philosophy studies in China.
__________
Translated from Jiangxi Shehui Kexue 江西社会科学 (Jiangxi Social Sciences), 2005 (2) by Chen Yuehua & Ma Minghui 相似文献
123.
The present study examined relations between choice preference and reaction time to emotionally valenced words, dysphoric symptoms (BDI), and dysfunctional attitudes (DAS) in clinically depressed (CD; n= 61), previously depressed (PD; n= 42), and never depressed controls (ND; n= 46). The results showed: (1) NDs and PDs exhibited a choice preference for the relatively more positive words and differed significantly from CDs; (2) PDs and CDs exhibited longer reaction time and differed significantly from NDs; and (3) BDI and DAS were positively associated with reaction time to positively valenced words, whereas no associations were found for reaction time to negatively valenced words. The increased reaction time, in PDs and CDs, is discussed as a possible vulnerability factor to depression, which may be related to decreased approach motivation. 相似文献
124.
125.
2006年1月23日,中共中央统战部、全国政协民族和宗教委员会、国家宗教事务局在全国政协礼堂三楼大厅举行了“宗教界人士迎春茶话会”。中共中央统战部副部长朱维群、二局副局长周宁、七局局长斯塔,全国政协民宗委副主任黄璜、全国政协办公厅副秘书长齐绪春,国家宗教事务局局长叶小文、副局长王作安、蒋坚永等有关方面领导和全国性爱国宗教团体负责人出席了茶话会。中国道教协会会长任法融道长,副会长张继禹道长、黄信阳道长,秘书长袁炳栋等出席了茶话会。中共中央统战部副部长朱维群代表中共中央统战部、全国政协民宗委、国家宗教事务局讲话… 相似文献
127.
Hao Wang 《Synthese》1995,102(2):215-234
The essay centers on Gödel's views on the place of our intuitive concept of time in philosophy and in physics. It presents my interpretation of his work on the theory of relativity, his observations on the relationship between Einstein's theory and Kantian philosophy, as well as some of the scattered remarks in his conversations with me in the seventies — namely, those on the philosophies of Leibniz, Hegel and Husserl — as a successor of Kant — in relation to their conceptions of time.For the physical world, the four dimensions are natural. But for the mind, there is no such natural coordinate system; time is the only natural frame of reference.Gödel, conversation on 15.3.72 相似文献
128.
The directional solidification process of ternary Ag42.4Cu21.6Sb36 eutectic alloy within a wide growth rate range from 2 to 60 μm/s was accomplished at a constant temperature gradient of 50 K/cm. As growth rate increases, the ternary (θ(Cu2Sb) + ε(Ag3Sb) + Sb) eutectic morphology evolves from “lamellar (θ + ε) plus fibrous (Sb)” structure into “(θ + Sb) fibres in continuous ε matrix” structure. The θ and (Sb) phase spacings decrease with the increase of growth rate according to power functions with exponent values of 0.55 and 0.56, respectively. It is also found that the microhardness of directionally solidified Ag42.4Cu21.6Sb36 alloy samples is enhanced with the increase of growth rate, and the decrease of θ and (Sb) phase spacings. 相似文献
129.
以康奈尔情绪DRM词表为主要实验材料, 使用简化的联合再认范式(DRM范式的变式), 结合多项式加工树建模的统计手段, 对34名年轻人(23 ± 2岁)和28名老年人(68 ± 5岁)的再认记忆进行比较, 以考察不同年龄组中情绪效价对错误记忆的作用机制。结果发现材料的情绪效价对错误记忆的影响存在显著年龄差异:(1) 积极情绪能够有效降低老年人的错误记忆, 其作用机制为积极情绪增强了老年人的字面痕迹而减弱了要点痕迹提取; (2) 消极情绪能够有效地降低年轻人的错误记忆, 其作用机制为消极情绪使年轻人反应偏向降低, 但不影响其记忆痕迹的提取。结果表明, 简化的联合再认范式下, 情绪效价对错误记忆的效应存在明显的年龄差异:老年人表现出积极情绪降低错误记忆的积极偏向; 年轻人表现出消极情绪降低错误记忆的消极偏向; 情绪效应对错误记忆的认知机制存在年龄差异。 相似文献
130.