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161.
应用探测任务范式和事件分割范式,以反应时、正确率、均字阅读时间等为指标,探讨主人公转换在记叙文情境模型更新中的作用。结果显示:(1)在主人公转换与事件转换一致时,主人公转换条件下的认知加工更加困难,表现为较长的反应时和均字阅读时间,以及较低的正确率和较高的分割概率。(2)在主人公转换与事件转换不一致条件下,主人公转换对反应时和均字阅读时间的影响显著降低,而分割概率与无转换条件无差异。这表明,事件是记叙文情境模型的核心;主人公维度仅在代表事件转换的条件下,才能引起情境模型的更新。 相似文献
162.
Neural localization of semantic context effects in electromagnetic and hemodynamic studies 总被引:5,自引:0,他引:5
Measures of electrical brain activity (event-related potentials, ERPs) have been useful in understanding language processing for several decades. Extant data suggest that the amplitude of the N400 component of the ERP is a general index of the ease or difficulty of retrieving stored conceptual knowledge associated with a word, which is dependent on both the stored representation itself, and the retrieval cues provided by the preceding context. Recordings from patients with brain damage, intracranial recordings, and magnetoencephalographic data implicate a (probably large portion of) the left temporal lobe as the largest source of the N400 semantic context effect, with a substantial but lesser contribution from the right temporal lobe. Event-related functional magnetic resonance (fMRI) studies using semantic context manipulations are dominated by observations of greater hemodynamic activity for incongruent sentence completions or semantically unrelated words than congruent or related words, consistent with the direction of the ERP effect. The locations of the hemodynamic effects show some variability across studies, but one commonly identified region is the left superior temporal gyrus, which is compatible with the electrophysiological results. A second commonly identified region in the fMRI studies is the left inferior frontal gyrus, which does not appear to make a substantial contribution to the N400 effect. 相似文献
163.
164.
Gómez-Lobo A 《Theoretical medicine and bioethics》2005,26(2):105-110
In order to understand the nature of human embryos I first distinguish between active and passive potentiality, and then argue that the former is found in human gametes and embryos (even in embryos in vitro that may fail to be implanted) because they all have an indwelling power or capacity to initiate certain changes. Implantation provides necessary conditions for the actualization of that prior, active potentiality. This does not imply that embryos are potential persons that do not deserve the same respect as actual persons. To claim that embryos become persons is to understand the predicate person as a phase sortal, roughly equivalent to adult person. This entails that we would not be essentially persons. In order to explain the traditional understanding of person as a proper sortal rather than a phase sortal, the author distinguishes between proximate and remote potentiality, and shows that, unlike feline embryos, human embryos, by their genetic constitution, possess the remote potentiality to later exercise the typically human activities. It follows that they are already persons essentially. 相似文献
165.
活体肝移植的伦理学问题 总被引:3,自引:0,他引:3
目前,肝移植已成为治疗终末期肝病的有效手段,活体肝移植术部分解决了供肝短缺的问题,10多年来其发展迅速,并取得了良好的疗效,由于活体肝移植需从活的供体身上切取部分肝脏,且供体多为患者家属,故存在着供体的选择,供体的贡献与代价,患者的家庭,心理,社会等伦理等问题。因此在提高活体肝移植技术水平的同时,必须充分考虑活体肝移植的伦理学问题,遵守伦理原则,使活体肝移植不但能从技术上达到,在伦理学方面也是可行的。 相似文献
166.
A. Ralph Barlow 《Pastoral Psychology》2007,55(4):395-409
In this essay I celebrate James E. Dittes’ impact on my ministry by reassessing three strategic moments in the church in Providence
I served for thirty-three years: a dinner, a Sunday morning summer service, and the replacement of the church’s dome. I try
to step outside of the heroic role assigned me back then, into a probing, however painful, investigation of the church’s,
and my own, darker side. 相似文献
167.
猜谜作业中顿悟的ERP效应 总被引:3,自引:0,他引:3
采用事件相关电位(ERP)探索问题解决过程中顿悟的神经机制。以猜谜作业为实验程序,对“有顿悟”和“无顿悟”答案引发的脑电分别进行叠加和平均,并将二者相减(有顿悟-无顿悟)得到差异波。在250~500 ms “有顿悟”比“无顿悟”的ERP波形有一个更加负性的偏移,在差异波中,这个负成分的潜伏期约为380 ms(N380)。地形图和电流密度图显示,N380在额中央区活动最强。偶极子源定位分析结果显示,N380可能起源于扣带前回。因此,N380可能反映顿悟问题解决过程中思维定势的突破。 相似文献
168.
东西方面孔异族效应机理的电生理学证据 总被引:5,自引:1,他引:4
采取事件相关电位方法研究东西方面孔记忆编码的差异(DM效应),从而阐明异族效应的神经机制。14名被试学习和再认东西方面孔照片的实验结果表明,无论记住与否,西方面孔产生的早期成分(潜伏期70~220ms)在头皮额部有一个比东方面孔更为正向的变化,表明在此阶段更多的资源分配于异族面孔,支持异族效应产生的特征选择假说。无论东方面孔还是西方面孔,记住与未记住相比较,则在额部和顶部产生潜伏期在晚期正成分(LPC)范围的正走向变化,但西方面孔在240~320ms潜伏期范围内,DM效应较小。另外,东方面孔在枕部诱发出一个明显的负波N260,而西方面孔产生的N260很小甚至没有,反映了大脑对不同种族面孔的编码机制有所不同,因而可能被称为“种族特异波” 相似文献
169.
170.
Megan A. Pope 《Journal of motor behavior》2019,51(1):113-120
Although, event and emergent timings are thought of as mutually exclusive, significant correlations between tapping and circle drawing (Baer, Thibodeau, Gralnick, Li, &; Penhune, 2013; Studenka, Zelaznik, &; Balasubramaniam, 2012; Zelaznik &; Rosenbaum, 2010) suggest that emergent timing may not be as robust as once thought. We aimed to test this hypothesis in both a younger (18–25) and older (55–100) population. Participants performed one block of circle drawing as a baseline, then six blocks of tapping, followed by circle drawing. We examined the use of event timing. Our hypothesis that acute experience with event timing would bias an individual to use event timing during an emergent task was not supported. We, instead, support the robustness of event and emergent timing as independent timing modes. 相似文献