拖延行为的认知神经模型及干预

拖延是一种普遍存在, 具有跨时间和跨情景稳定性的问题行为, 它会危害到人们的学习、工作和身心健康。然而目前拖延行为的认知神经机制仍不清晰, 且缺乏因果证据, 本项目拟从拖延的时间决策模型和三重神经结构网络模型出发, 构建拖延的认知神经模型, 并利用认知干预和神经调控技术, 检验和完善拖延行为的认知神经模型, 进而试图制定拖延的精准化干预方案。本项目分为3部分：(1)从记录与关联研究的视角出发, 利用多模态神经影像方法系统考察拖延行为的认知神经机制; (2)从因果/近因果研究视角出发, 利用认知干预和神经调控技术, 验证并完善拖延的认知神经模型; (3)从临床应用的视角出发, 建立拖延行为障碍的临床筛查-诊断体系, 并制定精准化治疗方案。本项目的开展对于探明拖延产生的核心认知神经机制具有十分重要的理论贡献, 同时对于拖延行为的有效预防和精准治疗具有重要的现实意义。     

拖延的认知神经机制与基因:行为-脑-基因的多角度研究

拖延是一种普遍存在,具有跨时间和跨情景稳定性的问题行为,严重的拖延甚至会危害到人们的工作、学习及身心健康。鉴于目前对于拖延的认知神经机制仍不清楚,研究模态较为单一,本研究拟从行为-脑-基因的系统研究思路出发,以多模态MRI(Task、Resting、VBM和DTI)为主要技术手段,将HTR2B基因多态性作为突破口,系统考察拖延的认知机制、神经基础和遗传基础,并试图制定拖延的应对与干预方案。研究分为4个部分:(1)从行为上,结合预期恐惧范式和跨期选择范式探索其拖延决策的机制;(2)在神经层面上,采用MRI多模态技术系统考察拖延行为的神经基础;(3)在基因层面上,采用分子遗传学方法,将HTR2B设定为靶基因以深入研究拖延的遗传基础,并考察脑结构和脑功能在基因与行为间的中介作用;(4)最后从行为干预与脑的可塑性的角度,设计拖延的干预方法来改善拖延行为并验证拖延的神经机制。     

自我控制减少拖延行为的认知神经机制

拖延行为常常阻碍个人、企业和政府按时完成既定任务,妨害了人们的工作、学业以及疾病防治等方方面面。自我控制是自主减少拖延行为的主要能力,但却是一种相对有限的认知资源。探明自我控制的作用机制有助于更高效地减少拖延行为。然而,由于缺乏合适的认知机制理论和脑成像实验范式,国内外研究多从现象层面探索自我控制、拖延行为和神经指标之间的关系。研究团队提出的“时间决策模型”通过揭示人们如何做出拖延决策,为认知机制的研究和脑成像实验范式的设计提供了理论支持。基于时间决策模型中“现在做还是以后做”的决策机制,本项目拟:(1)结合横向和纵向研究,考察自我控制作用的认知机制及其稳定性;(2)开发拖延的脑成像实验范式,结合多模态MRI技术,揭示自我控制减少拖延决策的神经基础;(3)利用神经刺激技术,考察“基于自我控制脑区的神经干预”的效果及作用机制。研究成果有望为拖延行为提供更加综合的理论框架和新的干预方案。     

青少年风险决策的发展认知神经机制

随着认知神经科学技术的发展, 青少年风险决策的发展认知神经机制成为了新近的一个热点课题。从双系统理论模型(社会情感神经网络系统、认知控制神经网络系统)出发, 对与青少年风险决策相关的大脑结构、功能的变化进行了阐述, 重点分析了新近的大脑功能连接、脑网络的研究; 阐述了青少年风险决策认知神经机制的主要理论模型：双系统模型和三角模型。未来研究还应加强对认知神经机制理论模型的检验、整合和创新, 从社会认知神经科学的角度深入研究社会参照系统(同伴关系、亚文化等)在青少年风险决策中的作用及机制, 以及从认知神经层面如何预防和干预青少年高风险行为。     

拖延的决策模型

拖延是指尽管预见到该行为会带来不利后果,人们仍自愿推迟开始或完成某一计划好的行为。先前的研究对拖延的类型、影响因素、成因以及干预等方面进行了广泛的探讨,然而拖延的决策过程——"现在做还是以后做?"认知机制还非常不清楚。因此,本文提出拖延决策模型试图从三方面阐明"现在做还是以后做?"的决策机制:首先,拖延动机和不拖延动机的斗争是决定是否拖延的根本;其次,拖延动机的斗争可以进一步简化为任务负性过程和任务正性结果的权衡;最后,主动推迟任务使负性过程发生延迟折扣是拖延的核心目的。拖延决策模型不仅有助于探明拖延的核心认知机制,也能够帮助预测拖延行为的发生及解释各种影响因素的作用机制,因此未来的研究可以借此整合一个从拖延的核心发生机制到各种影响因素的理论系统。     

赌博障碍的认知功能缺陷及神经基础

赌博障碍是指持续且反复的赌博行为,给个人、家庭和社会都带来了严重后果,近年来受到越来越多研究者的关注。本研究总结了赌博障碍的认知功能缺陷及其神经基础,主要集中在如下四个方面：①认知扭曲、②奖赏和惩罚敏感性、③注意偏向和④决策。未来研究应多从认知神经科学角度深入探究赌博障碍的发生机制和发展过程,关注大脑结构变化及功能网络改变,并将其整合到一个统一的神经生物机制框架中,找到更加有效的干预和治疗手段。     

赌博障碍的认知功能缺陷及神经基础

赌博障碍是指持续且反复的赌博行为,给个人、家庭和社会都带来了严重后果,近年来受到越来越多研究者的关注。本研究总结了赌博障碍的认知功能缺陷及其神经基础,主要集中在如下四个方面：①认知扭曲、②奖赏和惩罚敏感性、③注意偏向和④决策。未来研究应多从认知神经科学角度深入探究赌博障碍的发生机制和发展过程,关注大脑结构变化及功能网络改变,并将其整合到一个统一的神经生物机制框架中,找到更加有效的干预和治疗手段。     

拖延行为的时间取向模型

拖延(Procrastination)是指尽管预见到该行为会带来不利后果,人们仍自愿推迟开始或完成某一计划好的行为。首先重点阐释了新近发展的几个时间取向的拖延行为模型:时间动机理论(Temporal Motivation Theory,TMT)模型、时间取向的双维模型(2×2 model of time-related academic behavior)和概念模型(Conceptual Model));然后在时间取向理论基础之上从内部因素(人格因素、认知因素和应对策略等)和外部因素(家庭环境、学校教育、任务性质等)两个方面对拖延行为的成因进行了分析。未来研究应该从拖延行为的心理机制、神经基础、行为遗传学以及开发有效的干预方法等方面开展大量的研究。     

发展性计算障碍的最新研究进展

发展性计算障碍是一种影响算术技能获得的特定的学习障碍。截至目前,有关发展性计算障碍的认知与神经机制的理论尚存分歧,有关诊断与鉴别标准也未统一。近年来,对于发展性计算障碍的理论假设有从一般认知因素取向到数学特定因素取向发展的趋势。而随着脑成像技术的不断发展,对于发展性计算障碍神经机制的研究也从针对单个脑区的特异性功能发展到从功能连接网络角度进行研究。并且研究者们开始尝试开发基于数学认知基本理论的干预方法,并采用了利用生物技术手段的新方法。基因-脑-行为的整合研究将有助于全面揭示发展性计算障碍的发生机制,而建立在系统理论基础上经过科学评估的干预手段将可能有效促进障碍者的计算能力。     

脑认知功能及其哲学思考

近年来,国内外形成了脑认知功能的新热潮。从哲学思维的角度,分析了脑认知功能研究的发展概况。首先,在科学实践基础上,人们对大脑功能侧化问题进行了研究;其次,从联系的观点出发,现在人们更倾向于双脑协同是完成心理活动的神经学基础;最后,从系统的、发展的观点出发,赫曼提出了“全脑概念”,增加了边缘系统与神经心理功能的关系研究。     

学习拖延的整体化研究视角:传统与创新

传统的学习拖延是自我调节失败而导致非理性延迟的适应不良行为;最新研究提出了主动拖延的概念,认为主动拖延是自我调节的主动适应行为。根据学习拖延的定义及该领域的研究进展,将学习拖延分为三个阶段:传统学习拖延的多视角研究、传统学习拖延的自我调节研究、整体化观点的探索研究。文章依次介绍了每个阶段的研究成果。文章最后以自我调节机制为主线,整合了主动拖延和被动拖延,初步建立了一个拖延整体化模型。该模型的主要贡献在于,提出了干预被动拖延,促进主动拖延的有益于健康的整体化方案。     

预期想象对拖延的影响:想象过程和想象结果的效应分离

摘要 为了考察预期想象对不同拖延水平个体拖延行为的影响,本研究采用一般拖延量表(General Procrastination Scale)选取高拖延被试和低拖延被试,要求被试在进行模拟现实的拖延任务之前分别对任务过程和任务结果进行预期想象,比较不同拖延水平的被试在预期想象作用下拖延行为的变化。结果表明：(1)在两组被试中,相比于无想象条件下的拖延行为,对任务过程的预期想象增强拖延行为,对任务结果的预期想象削弱拖延行为;(2)对任务不同成分的预期想象所引发的情绪与拖延行为的变化相关显著。这说明情绪和预期想象是影响拖延的重要因素,合理地操纵对任务不同成分的预期想象可以有效干预拖延行为。     

The mystery of “should”: Procrastination,delay, and reactance in academic settings

The study explores the effect of trait reactance on procrastination and delay in students of two study programmes differing in the structuring of academic tasks and the role they play in course assessment. Both subsamples (n = 97 and 139) completed measures of trait reactance, chronic academic procrastination, self-reported task procrastination and actual task delay. The data were analyzed using path analysis and SEM. As hypothesized, psychological reactance positively predicted procrastination, especially the ‘chronic delay’ component underlying all three procrastination-related measures. However, some of the effect of reactance on this delay-dependent component of procrastination was apparently suppressed by what might have been a subjective (delay-independent) component of self-reported task procrastination. Furthermore, reactance was significantly related to delay only when good performance on the task was of relatively high importance. Apart from providing evidence for a possible link between reactance and procrastination, the results also demonstrate that it is important to distinguish between the experiential and objective (temporal) components of procrastination, as the two might be represented by completely different nomological networks.     

A Low-Intensity,High-Frequency Intervention to Reduce Procrastination

Studies assessing the efficacy of interventions aimed at reducing procrastination have generally lacked robust longitudinal measurement tools. Recent developments in communication technology and applications of the Experience Sampling Method (ESM) have made observations of such dynamic phenomena possible. We leveraged recent advancements in smartphone technology and ESM to measure delay associated with procrastination, while testing a low-intensity, high-frequency intervention to reducing that delay. First-year university students (N = 107) reported their progress on an assignment twice daily over 14 days prior to the required submission date. Half (n = 51) were randomly allocated to an intervention condition in which they were also asked open-ended questions designed to prompt reflection on four domains proposed to reduce procrastination, namely: expectancy, value, delay sensitivity, and metacognition. Multilevel mixed effect models revealed lower behavioral delay in the intervention condition compared to the control condition. This effect was strongest in those who at baseline scored below the median on trait procrastination. Behavioral delay over the 14-day period was not associated with later assignment submission or lower assignment marks. These findings support a novel method for reducing delay and suggest procrastination can be alleviated in a wide range of contexts using relatively inexpensive and non-intrusive strategies.     

The portrait of the procrastinator: Risk factors and results of an indecisive personality

Procrastinators purposefully delay the start or completion of tasks for their own irrational reasons and experience anxiety over the delay. However, imagining a typical ‘procrastinator’ evokes several conflicting images with differing experiences and personality correlates. One reason for this muddled picture may be conflated constructs. We posit that decisional procrastination (indecision) may be a related but distinct construct to more generalized procrastination, being highly correlated but with divergent predictors. In two studies, we examine competing hypotheses regarding the affective experiences (happiest moments; Study 1) and risk factors (personality correlates; Study 2) for both indecision and general procrastination using structural equation modeling (SEM). Results found indecision uniquely predicted fewer happy memories across a lifetime and less detail of those memories, controlling for initial affect. Furthermore, different magnitudes of predictive patterns emerged for indecision (strong neuroticism, moderate introversion) and generalized procrastination (strong unconscientiousness and weakly associated with neuroticism). In both studies, general procrastination led to indecision but models with the opposite effect were much weaker, suggesting procrastinating behavior predicts being indecisive but not vice versa. Results suggest differential experiences of indecisive individuals and more generalized procrastinators. Both procrastination traits appear related but distinct, explaining why ‘typical’ procrastinators can look so different psychologically.     

睡眠拖延行为背后的心理生理机制解析

摘 要 睡眠拖延行为是健康行为拖延领域提出的一个新概念，其可概括为在没有外部原因阻碍的情况下，仍无法在预定时间上床睡觉的现象。目前的研究认为睡眠拖延行为是导致普通人群睡眠不足的重要原因，睡前日常活动及沉浸式活动常常诱导其发生，探讨其背后机制主要涉及自我调节和生物节律两大因素。利用时限性自我调节理论可尝试解析睡眠拖延行为的发生过程。未来研究可从其神经机制探讨及预防和干预措施等方面尝试展开。     

Anxiety,Depression, and Procrastination Among Students: Rumination Plays a Larger Mediating Role than Worry

Procrastination is prevalent among students and is associated with negative outcomes, including poor academic performance and psychological distress. Research also suggests that anxiety and depression can exacerbate procrastination; however, the mechanisms associated with the development of procrastination are less understood. The current study aimed to clarify the role of negative repetitive thought (i.e., rumination and worry) in the links between anxiety and procrastination, and depression and procrastination. Ninety-one undergraduate students completed self-report measures of anxiety, depression, worry, brooding rumination, and procrastination, and two multiple mediator models were tested. Procrastination was positively correlated with the study variables, including medium effects for anxiety and depression, a large effect for rumination, and a small effect for worry. Rumination independently mediated the relationships between anxiety and procrastination, and depression and procrastination. Worry did not independently mediate these relationships. The current findings suggest rumination plays a larger role in the links between anxiety, depression, and procrastination than worry. Thus, students with higher levels of anxiety and depression engage in more negative repetitive thought, which may contribute to procrastinatory behavior as a result of a preoccupation with depressing or painful thoughts about the past.