时间贴现的分段性

以延迟和相对延迟时间贴现的实验范式, 用选择法、匹配法确定价值主观相等点, 探讨时间贴现的分段性。三个实验和一个问卷调查发现, 时间贴现具有分段性。被试的时间贴现有三次显著变化, 表现为三个时段时间贴现心理状态的不同: 从现在到未来2周内规避损失、偏好风险、愿意短期等待, 从未来2周起直到未来10年采取非补偿性策略、需求与风险并重、愿意长期等待, 和从未来10年起直到未来50年规避风险、聊胜于无、不愿意等待。     

健康领域的跨期决策与健康行为

健康领域的跨期决策关系着个体和国民的健康和福祉。目前学界对该领域的研究主要停留在参考传统金钱领域的相关理论模型和方法的阶段, 但健康跨期决策具有领域特异性, 沿袭金钱领域理论模型和方法, 导致该领域在研究方法和结果上存在较大的不一致性。健康跨期决策的行为后果是该领域关注重点, 多数研究均报告个体的低时间折扣率、高未来时间取向与其健康保护行为正相关, 与健康风险行为呈负相关。该领域也关注健康跨期决策的影响机制, 如决策对象和决策主体的核心特征等因素。未来研究亟需发展适用于健康领域的跨期决策模型和研究范式, 明确健康行为与跨期决策偏好的关系, 深入探讨健康跨期决策的内在选择机制, 并在健康行为干预和医疗卫生政策应用方面进行更多的尝试和探索。     

成瘾人群跨期选择的神经机制及干预方法

成瘾可分为物质成瘾和行为成瘾, 两类成瘾人群在跨期选择上都表现出高时间折扣率的缺陷, 但也有各自的特异性特征。成瘾人群跨期选择缺陷的神经基础主要集中在评估网络(腹内侧前额叶、纹状体、后扣带皮层等)、认知控制网络(前额叶皮层、前扣带皮层等)和预期想象网络(海马、杏仁核等); 可利用心理训练来改善成瘾人群跨期选择缺陷, 其干预方法包括工作记忆训练、预期想象训练、金钱管理指导等。未来研究应该从成瘾者跨期选择缺陷的认知机制、3个神经网络系统的交互作用机理、行为遗传学以及开发有效的干预方法等方面展开大量研究。     

风险决策和跨期决策的过程比较：以确定效应和即刻效应为例

风险决策和跨期决策与人类生存发展密切相关, 且两类决策在理论发展、行为效应及神经基础等方面具有相似性。为检验二者是否具有共同过程机制, 本研究以风险决策中的确定效应和跨期决策中的即刻效应为例, 采用眼动追踪技术比较了它们的局部、整体过程及模型拟合。辅以贝叶斯因子分析实验数据表明：二者的主要过程特征均相似, 且更符合非折扣模型假设; 二者在加工复杂程度等少数特征上有所不同; 确定和即刻信息在加工方向等特征上存在特异性。这表明二者可能具有共同的核心决策规则：两类决策更可能遵循非折扣模型预期的简捷、启发式规则, 而不是折扣模型所假设的补偿性、基于选项规则。本研究为建立两类决策的共同解释框架做出了有益尝试, 并为决策比较研究方法提供新的方向。     

时间感知在跨期决策中的作用——时间决策模型的新探索

“时间”是跨期决策的“必需品”, 人们感知到的延迟时间决定跨期决策的结果。近年来, 研究者发现“时间长度感知”、“时间资源感知”和“时间框架感知”是时间感知作用于跨期决策的主要方式。时间感知的神经作用机制包含微观层面和宏观层面两种。“对数/指数时间折扣模型”、“感知时间基础模型”及“多模态漂移扩散模型”解释了时间感知的作用方式。然而, 现有理论模型还存在诸多局限, 主要包括“长短时距预测偏差”和“实际决策与预期决策偏差”两个方面。因此, 深入探讨时间感知影响跨期决策的基本方式, 分析现有理论模型的局限性并提出整合的机制框架具有十分重要的意义。未来研究亟需进一步整合时间感知的理论模型, 开展脑机制与应用方面的研究, 从深层揭露时间感知的作用本质, 帮助个人与社会更理性地决策。     

Choices and opportunities: another effect of framing on decisions

Many decisions can be framed either as ‘choices’ between alternative courses of action (e.g. Should I move to New York or stay in Chicago?) or as ‘opportunities’ to pursue a particular course of action (i.e. Should I move to New York?). Although there is no logical difference between these two different decision frames, there may be important psychological differences between them. In four studies, we explore the differences between ‘choices’ and ‘opportunities’. The results of Studies 1 and 2 show that college students view many of the decisions they typically face as opportunities, rather than choices. Further, the results of Study 2 suggest that the frame students adopt is systematically related to the preferences they express. The latter finding led to Studies 3 and 4, where we show that preferences can be influenced by encouraging people to adopt one decision frame rather than another. © 1998 John Wiley & Sons, Ltd.     

选择与坚持:跨期选择与延迟满足之比较

做出选择与坚持选择是决策活动的两个重要阶段。跨期选择源于经济学领域对成人对发生在不同时间点的结果"做出选择"过程的研究;延迟满足则源于心理学领域对儿童为获得未来较大收益而抵制当前诱惑的"坚持选择"过程的研究。二者均致力于研究与时间相关的决策活动,从不同视角关注个体的冲动性与自我控制,但鲜见学者对二者异同的系统比较。本文着重从研究方法、认知机制与神经基础入手探讨了二者的异同,冀为两个研究领域协同发展、共同促进人类远见的培养与实践提供科学的理论支持。     

Strategy choices in simple and complex addition: Contributions of working memory and counting knowledge for children with mathematical disability

Groups of first-grade (mean age = 82 months), third-grade (mean age = 107 months), and fifth-grade (mean age = 131 months) children with a learning disability in mathematics (MD, n = 58) and their normally achieving peers (n = 91) were administered tasks that assessed their knowledge of counting principles, working memory, and the strategies used to solve simple (4+3) and complex (16+8) addition problems. In all grades, the children with MD showed a working memory deficit, and in first grade, the children with MD used less sophisticated strategies and committed more errors while solving simple and complex addition problems. The group differences in strategy usage and accuracy were related, in part, to the group difference in working memory and to group and individual differences in counting knowledge. Across grade-level and group, the switch from simple to complex addition problems resulted in a shift in the mix of problem-solving strategies. Individual differences in the strategy mix and in the strategy shift were related, in part, to individual differences in working memory capacity and counting knowledge.     

The quest for identity

This paper offers an analysis of the notion the quest for identity. The discussion emphasizes the importance of communal belonging, but rejects the view that one ought to belong to the community one was born to. It suggests that the quest for identity may lead individuals to follow many avenues: while some individuals might affirm their inherent affiliations and traditions, others may remain within their community of origin and strive to change its ways, or chose to leave their social group and opt for membership in a new one. This analysis suggests that choice, characteristic of the liberal conception of the person, and rootedness, characteristic of the communitarian conception of the person, both play an important role in the formation of personal identity.     

问题启动对跨时选择的影响研究

本研究采用2×3混合实验设计,通过控制时间距离和表征的建构水平,对不同问题启动下的跨时选择进行对比研究。实验结果显示,问题启动是影响跨时选择的重要因素,不同问题启动下的未来结果价值折扣存在显著差异。Why问题启动使个体的时间距离敏感度降低,How问题启动使个体的时间距离敏感度提高。