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91.
    
Background/Objective: This study aims to characterize the differences on the short-term temporal network dynamics of the undirected and weighted whole-brain functional connectivity between healthy aging individuals and people with mild cognitive impairment (MCI). The Network Change Point Detection algorithm was applied to identify the significant change points in the resting-state fMRI register, and we analyzed the fluctuations in the topological properties of the sub-networks between significant change points. Method: Ten MCI patients matched by gender and age in 1:1 ratio to healthy controls screened during patient recruitment. A neuropsychological evaluation was done to both groups as well as functional magnetic images were obtained with a Philips 3.0T. All the images were preprocessed and statistically analyzed through dynamic point estimation tools. Results: No statistically significant differences were found between groups in the number of significant change points in the functional connectivity networks. However, an interaction effect of age and state was detected on the intra-participant variability of the network strength. Conclusions: The progression of states was associated to higher variability in the patient's group. Additionally, higher performance in the prospective and retrospective memory scale was associated with higher median network strength.  相似文献   
92.
    
A large number of theories about the development and maintenance of paranormal beliefs have been raised in the literature. There is, however, a lack of studies designed to integrate the different perspectives. We reviewed the literature and explored a series of factors in a sample of 180 individuals. Seven variables showed significant correlation indices at α = .01. A regression analysis revealed subjective paranormal experience as the variable that contributed the most to the explanation of paranormal belief, z = .43, 95% confidence interval (CI) [.24, .56]. Need for achievement (z = .31, 95% CI [.11, to .46]), conditional reasoning (z = .10, 95% CI [.09, .28]), and schizotypy (z = .29, 95% CI [.09, .45]) also contributed significantly in the equation. The associations found between the subscales of the Needs Questionnaire and belief in the paranormal support the hipothesis that paranormal belief may serve basic psychological needs. Similarly, the association found in the case of schizotypy suggests that paranormal belief might be held within the context of psychopathology. There was no evidence, however, supporting the hypothesis of a reasoning deficit in believers. It was concluded that, once paranormal beliefs develop, there is an interaction between belief and experience that strongly contributes towards its maintenance.  相似文献   
93.
    
The authors examine how the cognitive complexity domains of differentiation and integration are uniquely cultivated by constructivist and phenomenological teaching practices, respectively. Implications are explored in terms of reflective practices and proposed phenomenological activities that support concept deconstruction and empathy development as a means to grow integrative complexity.  相似文献   
94.
    
Examining the implications of excessive work demands on employee well-being is an important research area of occupational health psychology. Recovery during nonwork time has been emphasized as an important process for mitigating the negative implications of excessive work demands. However, this notion ignores the potential for nonwork activities to be comparably demanding to work activities. There has been a lack of attention paid to the potentially complex interrelationships between work and nonwork demands. Using the effort–recovery and challenge–hindrance stressor models, we developed a set of hypotheses for both the positive and negative implications of the interplay between employee work and nonwork cognitive demands. We collected information on cognitive workweek job demands (Friday) and nonwork cognitive weekend demands (Sunday) from a sample of workers (N = 146), and we used polynomial regression with response surface analysis to examine how different aspects of work–nonwork cognitive demand (in)congruence related to Monday work engagement. In general, higher cognitive workweek job demands promoted work engagement, even when nonwork cognitive demands were equally high. Cognitive demand incongruence that favoured higher cognitive work demands was also beneficial for employee work engagement. Theoretical and practical implications are discussed, along with directions for future research in this area.  相似文献   
95.
    
Pro-group unethical behaviour (PGUB) refers to a set of behaviours that conflict with moral standards but are beneficial to the interests of an actor's workgroup. Drawing on social cognitive theory, this research investigates whether, how, and when perceived co-worker PGUB leads employees to engage in the same unethical behaviour. We propose that moral disengagement is a crucial mechanism through which PGUB is transmitted from co-workers to employees and that this relationship is further amplified by employees' group identification. The results of three field studies featuring different samples consistently highlight the mediating role of moral disengagement in the relationship between perceived co-worker PGUB and employee PGUB. Furthermore, employees who identify strongly with their workgroup are more likely to exhibit moral disengagement and learn their co-workers' PGUB than are employees with low group identification. The findings of this research provide insights for both theory and practice.  相似文献   
96.
Lars B 《心理学报》2009,41(11):1040-1048
在这篇文章中, 我将讨论从正常老化到痴呆, 这一通常被称为痴呆前临床阶段的认知功能的转变。研究表明, 阿尔茨海默症和血管性痴呆病人在临床确诊之前的几年中, 会出现明显的认知损伤。早期最突出的损伤存在于情节记忆、加工速度以及执行功能。这些功能性损伤与神经生物学研究证实的边缘系统和新皮层区存在多重损伤是相一致的。虽然早在临床诊段之前, 病人组和控制组的平均成绩存在巨大差异, 但同时这两组测试成绩的分布在很大程度上是重叠的。寻求降低这种重叠度的方法是未来研究的一个重要任务。这有可能通过将认知的和其他指标(如基于脑的、基因的、临床的、社会的)相结合构建预测模型来实现。此外, 在未来研究中以下三方面也是急需考虑问题: (a) 找出在 前临床期间认知功能急速下降的时间点: (b) 评估从前临床到临床诊断变化速率中存在的个体差异; (c) 确定特定因素与随后发生的痴呆之间的关联强度是如何随时间向临床确诊推进而逐渐变化的。  相似文献   
97.
原三娜  罗晓敏  张帆  邵枫  王玮文 《心理学报》2014,46(12):1805-1813
注意定势转移任务(attentional set-shifting task, AST)可用于特异性检测啮齿类动物前额叶皮层及其皮层下神经通路介导的认知灵活性, 是目前研究认知灵活性及其障碍神经基础的重要模型。本研究系统调查了大鼠种系和检测程序差异对AST结果的影响。通过比较Wistar和Sprague Dawley (SD)两个种系大鼠在七阶段和五阶段两种AST检测程序中的认知表现, 研究发现:(1) SD和Wistar大鼠前额叶认知功能存在差异, 后者的总体认知表现优于前者。尤其是Wistar大鼠在逆反学习阶段的达标训练次数及错误率显著低于SD大鼠, 表明Wistar大鼠具有更高的策略转换灵活性。(2)在AST测试中逆反学习和外维度定势转移是认知灵活性评价的核心指标。这两种认知转换过程分别以前期策略和注意定势建立为基础。结果显示在两种AST检测程序中Wistar和SD大鼠在逆反学习和/或外维度定势转移等复杂学习阶段的达标训练次数和错误率均高于其它简单关联学习阶段, 表明在目前实验条件下大鼠均表现出定势形成和转换困难的反应模式, 不同认知反应间的结构关系具有稳定性。这些结果提示大鼠前额叶皮质介导的认知灵活性存在种系差异, AST各阶段认知反应间的结构效度不受目前使用的大鼠种系和检测程序差异的影响, 扩展了对AST模型的认识。  相似文献   
98.
轻度认知损伤(Mild cognitive impairment,MCI)是介于正常老化与痴呆之间的过渡阶段,表现为与年龄和教育程度不相称的认知功能减退。本文回顾了近期有关MCI语义记忆的研究,分析比较了各研究的实验任务及结果,得出MCI患者存在一定程度的由多种原因造成的语义记忆损伤,语义记忆测验对MCI的早期筛查和转归预测有重要作用。最后指出将来的研究需要将包括语义记忆成分在内的多种认知测验相结合,以便及早发现有可能发展为痴呆的危险个体并开展相应干预。  相似文献   
99.
知识反转效应研究始于20世纪90年代中期, 在认知负荷的框架下对学习者先备知识与教学方法有效性之间的交互作用进行研究, 其研究范式起源于能力倾向与教学处置交互作用模型。认知负荷理论认为知识反转效应的产生是由于高先备知识者接受冗余教学而产生了额外的认知负荷, 动机理论却认为, 高先备知识者由于冗余的认知加工而产生的负荷可能是一种动机资源负荷。在优化外在认知负荷与相关认知负荷的教学设计中发现了大量知识反转效应的实验证据, 其教学的启示意义在于需要随着学习者领域知识的不断变化适宜性地调整教学方法。未来需要在完善研究方法、拓展研究领域的基础上, 整合研究成果以建立效应发生与发展的理论模型。  相似文献   
100.
刘艳 《心理科学进展》2011,19(3):427-439
在回顾自我建构理论发展脉络的基础之上, 介绍了特质性自我建构的测量和情境性自我建构的激活方法, 并从自我建构的性别与文化差异以及自我建构与认知风格、社会比较、人际交往、个人自主、自我调控的关系等几方面概述了该领域现状。该领域研究的进一步推进依赖于自我建构理论基本思想的完善、测查工具的改进以及研究者能否用辩证视角看待变量间关系。特质性自我建构对个体稳定的个性心理特征以及适应状况的影响, 特质性自我建构个体差异的影响因素应在未来研究中得到重视。  相似文献   
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