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211.
George Weaver 《逻辑史和逻辑哲学》2013,34(4):375-398
A Dedekind algebra is an ordered pair (B, h), where B is a non-empty set and h is a similarity transformation on B. Among the Dedekind algebras is the sequence of the positive integers. From a contemporary perspective, Dedekind established that the second-order theory of the sequence of the positive integers is categorical and finitely axiomatizable. The purpose here is to show that this seemingly isolated result is a consequence of more general results in the model theory of second-order languages. Each Dedekind algebra can be decomposed into a family of disjoint, countable subalgebras called the configurations of the algebra. There are ?0 isomorphism types of configurations. Each Dedekind algebra is associated with a cardinal-valued function on ω called its configuration signature. The configuration signature counts the number of configurations in each isomorphism type that occurs in the decomposition of the algebra. Two Dedekind algebras are isomorphic iff their configuration signatures are identical. The second-order theory of any countably infinite Dedekind algebra is categorical, and there are countably infinite Dedekind algebras whose second-order theories are not finitely axiomatizable. It is shown that there is a condition on configuration signatures necessary and sufficient for the second-order theory of a Dedekind algebra to be finitely axiomatizable. It follows that the second-order theory of the sequence of the positive integers is categorical and finitely axiomatizable. 相似文献
212.
Young‐Hoon Kim Chi‐Yue Chiu Sinhae Cho Evelyn W. M. Au Sunyoung Nicole Kwak 《Asian Journal of Social Psychology》2014,17(1):44-51
Past research shows that European Americans tend to take a first‐person perspective to understand the self and are unlikely to align the inside look with the outside gaze, whereas Asians tend to take a third‐person perspective and are likely to shift their inside look in the direction of the outsize gaze. In three experiments, we compared Asians and European Americans' self‐perceptions when the presence of their parents in the background of self‐perception was primed or otherwise. Without the priming, both European Americans and Asians viewed themselves more positively from their own perspective than from their parents' perspective. With the priming, only Asians lowered the positivity of their self‐perceptions to match the perceived positivity of the self in the parents' perspective. These results suggest that Asians do not have a static, passive tendency to assimilate their self‐views into the perceived external assessments of the self. Rather, their self‐views are fluid and flexible. 相似文献
213.
Every day we use products and treatments with unknown but expected effects, such as using medication to manage pain. In many cases, we have a choice over which products or treatments to use; however, in other cases, people choose for us or choices are unavailable. Does choosing (versus not choosing) have implications for how a product or treatment is experienced? The current experiments examined the role of choice‐making in facilitating so‐called expectation assimilation effects—or situations in which a person's experiences (e.g., discomfort and pain) are evaluated in a manner consistent with their expectations. In Experiment 1, participants were initially exposed to a baseline set of aversive stimuli (i.e., sounds). Next, some participants were given expectations for two “treatments” (i.e., changes in screen display) that could ostensibly reduce discomfort. Critically, participants were either given a choice or not about which of the two treatments they preferred. Participants in a control condition were not provided with treatment expectations. Results revealed that discomfort experiences assimilated to expectations only when participants were provided with choice. Experiment 2 replicated this finding and provided evidence against the idea that demand characteristics and choice‐making unrelated to the core task (i.e., choices without associated expectations) could account for the results. Further, Experiment 2 showed that choosing reduced discomfort because of increased positivity about the treatment. Results are discussed in the context of extant research on choice‐making and expectation effects. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
214.
在视觉搜索过程中,老年人是否可以在不同情境下调节自上而下和自下而上的加工水平尚不明确。为了探讨老化对认知灵活性的影响,研究采用空间线索范式,通过比较有效线索和无效线索来考察对线索的注意加工水平(注意捕获、注意抑制),通过比较目标相关和目标无关线索的注意加工水平来考察自上而下和自下而上的作用,通过改变分心物一致性来调控不同的目标凸显情境。结果发现,年轻组在目标非凸显时的空间线索效应高于目标凸显时,表明年轻人会依据目标凸显性调整自上而下的加工水平;但老年组却没有产生这种差异,其更依赖自上而下的加工,注意系统会对目标相关的线索进行注意捕获,对目标无关的线索进行注意抑制。结果表明,随着年龄的增长,认知控制的灵活性下降,表现出对自上而下加工较多的依赖;此外,老年人依然保留着注意捕获和注意抑制的能力,这对认知老化中抑制能力受损的观点提出了挑战。 相似文献
215.
老年人生命教育既包括生死教育,也包括生命健康教育。老龄社会为老年人生命教育发展提供难得的机遇,如老年人生命问题为其发展提出了现实要求,“以健康为中心”理念为其提供了理念基础,各种政策为其发展提供了依据。但是,由于我国社会传统中的重“生”观念、以“治疗为中心”的理念、教育体系不完备以及生命教育内容融入问题等,严重制约老年人生命教育开展。为此,应当以生活方式医学重构老年人的生命健康理念,并在个人、社会及政府三个层面探索相关措施以推进老年人生命教育。
相似文献216.
217.
词频效应指语言产生中人们对高频词汇的加工比低频词汇更快更准确的一种现象,它可能发生在语言产生中的不同阶段。对青年人和老年人词频效应的不同特点和加工机制进行比较,可以考察语言产生的认知老化机制。通过语言产生理论可对词频效应的老化进行预测,提出词频效应在个体发展和老化阶段的相对稳定性,分析老化导致词频效应相关的神经基础和加工时间进程的改变。未来研究可进一步分离词频效应与习得年龄效应对语言产生老化的影响,并扩展至神经退行性疾病患者中。 相似文献
218.
以442名初中生为被试,采用历时20个月的纵向研究考察家庭社会经济地位(socioeconomic status, SES)和积极品质对中考成绩的预测作用。结果发现:(1)家庭SES、积极品质整体发展水平可以同时显著正向预测初中生在20个月后的中考成绩;(2)积极品质整体发展水平在家庭SES与中考成绩之间存在中介作用,即家庭SES越高,初中生的积极品质整体水平越高,其中考成绩越好。研究结果提示积极品质可以补偿低家庭SES对学生中考成绩的不良影响。 相似文献
219.
为探究积极和消极情绪与自我控制在自我同情与睡眠质量间的中介机制,采用问卷法对477名成人进行调查,建立结构方程模型对中介效应进行检验。结果发现:(1)自我同情、积极情绪、自我控制和睡眠质量两两之间均为显著正相关,而上述变量与消极情绪均为显著负相关;(2)自我同情可分别以积极情绪、消极情绪和自我控制为中介来预测睡眠质量;还可依靠消极情绪与自我控制的链式中介效应来间接预测睡眠质量,但自我同情对睡眠质量的直接效应不显著。该研究结果为改善睡眠质量提供了新的干预视角。 相似文献
220.