跨期选择中的反常现象及其心理机制

时间折现是跨期选择研究的核心问题。指数折现效用模型（DU模型）是描述时间折现现象的基本模型。跨期选择的实验研究中发现的大量违背DU模型的反常现象表明,DU模型并不能很好地解释人们在跨期选择中的真实行为。文章从时间知觉、建构水平、参照点和价值函数、情绪激活、情绪麻木、期待效用等角度探讨了造成各种反常现象的心理机制,并提出了值得进一步研究的方向和问题。     

时间分解效应及其对跨期决策的影响

本文基于经典的分解效应, 提出并证实了一种影响人们判断与决策中时间知觉的新因素--时间分解效应。共包括两个研究, 分别在“时间够用”判断与跨期决策中检验了该效应的存在性与稳固性。实验结果表明：(1)相比未分解条件, 分解条件下的被试判断给定时间内完成某项任务的时间更够用, 即时间知觉更长。该效应受到任务难度的调节, 在较简单的任务中时间分解效应更显著; (2)在跨期决策中, 分解操纵增大了人们对较大较远的收益(larger & later, LL)选项中时间延迟的知觉, 证实了时间分解效应。此外, 还发现时间分解效应会导致人们在跨期决策中更偏好较小较近的收益(smaller & sooner, SS)选项, 对时间延迟的知觉中介了这一过程。总之, 本研究不仅在理论上提出了一种新的分解效应, 同时对现实生活中的决策(如计划制定等)有重要的应用价值。     

音乐知觉期待的研究述评

音乐知觉期待是音乐时间知觉过程中重要的心理现象,它直接影响音乐作为时间艺术的本质特性。文章主要探讨了和音乐知觉期待相关的以下几方面问题：音乐知觉期待存在的范畴,音乐知觉期待依靠音乐元素的四种期待率,音乐知觉期待存在的两种类别和采用的五种研究范式,音乐知觉期待研究的主要领域（神经生理机制、记忆和启动效应等方面）,以及音乐知觉期待通过音乐时间知觉和时间估计对音乐时间操作的影响。展望该领域今后研究的方向,可以认为,对音乐知觉期待的心理特征和存在条件在音乐时间操作中作用的进一步研究,将在很大程度上揭示音乐时间操作中的普遍现象——计时偏差的真正原因     

跨期选择中的年龄差异及其机制

随着老龄化形势日益严峻, 老年人的跨期选择受到越来越多学者的关注。目前关于跨期选择的年老化研究尚存分歧:有研究发现老年人比年轻人更偏好未来获得更大收益; 也有研究发现老年人的选择偏好和年轻人一样, 甚至比年轻人更偏好近期收益。从时间表征和结果价值表征两个维度上的加工过程去分析其对老年人跨期选择的影响, 并进一步阐述认知、动机和情绪因素对两个维度加工过程的影响, 这对于理解当前老年人跨期选择领域研究的分歧有重要科学意义。     

情绪对时间知觉的影响

研究了情绪唤醒度和愉悦度对时间知觉的影响及其机制.以53名大学生为被试,采用中国情绪图片系统为情绪诱发材料,使用时间两分法和泛化法考察唤醒和注意机制对时间知觉的影响.结果表明:在短时距下,(1)唤醒度和愉悦度对时间知觉的影响可能是独立的,两个实验中交互作用都不显著;(2)情绪主要通过唤醒机制影响时间知觉,被试在高唤醒情绪下知觉到的时间显著长于在低唤醒情绪下知觉到的时间.     

权力与耐心：权力感对时间知觉与跨期决策的影响

已有研究发现高权力感会使个体更耐心,更偏好延迟的大奖励。本研究假设高权力感导致耐心也会体现在时间知觉上,并且时间知觉是高权力导致耐心的心理机制。研究通过考察权力感对时间知觉与跨期决策的影响,以及时间知觉的中介作用对此假设进行了检验。实验1通过回忆法启动权力感,检验权力感对时间知觉的影响;实验2采用角色扮演法启动权力感,考察权力感对跨期决策的影响,并检验时间知觉的中介作用。结果发现：相比低权力感,高权力感个体感觉时间过得更快,进而使个体在跨期决策中更偏好延迟的大奖励,权力感并不直接影响跨期决策。研究揭示了权力感对时间知觉的影响,为权力感影响耐心行为的解释提供了时间知觉的新视角。     

跨期选择中偏好反转的心理机制

通过直接测量近期和远期选择中备选项激活的情绪、间隔的时间知觉及对备选项金额差异和时间间隔的重视程度,以探究跨期选择中偏好反转产生的心理机制。结果表明：（1）近期选择中,备选项激活的情绪强度差异显著,而远期选择中两者的差异不显著;（2）近期和远期选择中,情绪强度差异和时间知觉差异能够预测偏好反转的发生。研究结果支持了偏好反转的情绪激活差异假说和时间知觉差异假说。     

时间感知差异对跨期选择倾向的影响作用

本研究从人格特质差异角度出发, 采用简单跨期选择任务考察了由时距复制任务筛选的两类时距估计倾向不同的群体(时间高估者和时间低估者)在跨期选择中行为倾向的差异, 旨在探讨时间感知在跨期决策中的影响作用。结果发现：(1)无论任务难易, 与时间低估者相比, 时间高估者在跨期选择时更倾向于选择即时兑现的较小奖赏。(2)时间高估者和低估者的跨期选择反应时没有明显的差异, 但二者的反应时受任务难度的影响程度明显不同, 时间高估者的跨期选择反应时不受任务难度的影响, 而时间低估者在任务困难时的反应时比任务容易时明显增长。这些结果表明, 在跨期选择过程中, 时间感知倾向差异明显地影响了个体的选择倾向。时间高估倾向个体对时距的高估可能会导致其在跨期选择权衡中对收益成本的高估, 进而做出冲动的选择行为。     

客体工作记忆的保持对时距知觉的影响

初步探讨毫秒范围内,客体信息保持对时间知觉的影响。实验一发现,知觉到的时间不受记忆负荷的影响,但当保持时间短时,低负荷的反应时低于高负荷的反应时;实验二仅要求被试完成时间知觉任务,发现知觉负荷异于记忆负荷对时间知觉的影响。结果说明,客体工作记忆保持对时间知觉的影响受到工作记忆资源的调节。     

佤族与汉族大学生的跨期决策：时间知觉的作用？

为探究佤族大学生的跨期决策偏好,本研究采用多领域的跨期决策任务,通过对比佤族和汉族大学生跨期决策和时间知觉特点,探讨了民族文化对不同领域延迟折扣的影响,以及时间知觉的中介作用。结果表明,金钱领域中,佤族与汉族之间的延迟折扣率无明显差异;而在健康和环境领域中,佤族延迟折扣率显著低于汉族,更偏好将来更大的收益;佤族的时间知觉显著小于汉族,并且时间知觉在民族和各领域延迟折扣之间起到了中介作用。     

敬畏对跨期选择的影响：时间洞察力和时距敏感度的作用

本研究考察了情绪(敬畏、愉悦和中性)对跨期选择的影响机制,以及时距敏感度和时间洞察力在其中的作用。结果显示：(1)相比中性,敬畏情绪下个体的折扣率更大;(2)相比中性,敬畏情绪下折扣率降幅更大;(3)对于未来取向者,敬畏情绪下折扣率比中性条件下更大;(4)对于现在取向者,敬畏情绪下折扣率降幅比中性条件下更大。结果表明,敬畏情绪通过未来时距的敏感度影响跨期选择偏好,使个体更加偏好延迟奖赏,同时,个体的时间取向在其中起调节作用。     

厌恶和恐惧情绪对跨期选择的不同影响：基于ERP的研究

本研究运用事件相关电位技术(ERPs)考察厌恶和恐惧情绪对跨期选择的影响。其中,厌恶和恐惧情绪采用情绪面孔图片进行启动,分析跨期选择任务中评估阶段所诱发的ERP成分。行为结果发现,与中性面孔相比,厌恶面孔启动使个体倾向于选择立即奖赏。ERP结果发现,在选项评估阶段,厌恶面孔比中性和恐惧面孔启动诱发更大的P2、P3和LPP波幅。这说明,厌恶情绪促使个体投入更多的注意和动机资源对跨期选项进行评估,进而使个体倾向即时满足。     

厌恶和恐惧情绪对跨期选择的不同影响：基于ERP的研究

本研究运用事件相关电位技术(ERPs)考察厌恶和恐惧情绪对跨期选择的影响。其中,厌恶和恐惧情绪采用情绪面孔图片进行启动,分析跨期选择任务中评估阶段所诱发的ERP成分。行为结果发现,与中性面孔相比,厌恶面孔启动使个体倾向于选择立即奖赏。ERP结果发现,在选项评估阶段,厌恶面孔比中性和恐惧面孔启动诱发更大的P2、P3和LPP波幅。这说明,厌恶情绪促使个体投入更多的注意和动机资源对跨期选项进行评估,进而使个体倾向即时满足。     

时间洞察力对跨期选择偏好的预测

利用津巴多时间洞察力问卷,采用跨期选择经典范式,考察“现在享乐型”和“未来定向型”两类时间洞察力个体在跨期选择上的偏好,从人格特质角度来探究跨期选择的认知机制。结果发现：(1)现在享乐定向组的延迟折扣率显著高于未来定向组;(2)未来定向组在时间洞察力量表“未来维度”得分与延迟折扣率显著负相关。这说明时间洞察力对个体延迟折扣率具有预测作用,支持了跨期选择的时间感知基础模型。     

Age differences in vocal emotion perception: on the role of speaker age and listener sex

Older adults have greater difficulty than younger adults perceiving vocal emotions. To better characterise this effect, we explored its relation to age differences in sensory, cognitive and emotional functioning. Additionally, we examined the role of speaker age and listener sex. Participants (N?=?163) aged 19–34 years and 60–85 years categorised neutral sentences spoken by ten younger and ten older speakers with a happy, neutral, sad, or angry voice. Acoustic analyses indicated that expressions from younger and older speakers denoted the intended emotion with similar accuracy. As expected, younger participants outperformed older participants and this effect was statistically mediated by an age-related decline in both optimism and working-memory. Additionally, age differences in emotion perception were larger for younger as compared to older speakers and a better perception of younger as compared to older speakers was greater in younger as compared to older participants. Last, a female perception benefit was less pervasive in the older than the younger group. Together, these findings suggest that the role of age for emotion perception is multi-faceted. It is linked to emotional and cognitive change, to processing biases that benefit young and own-age expressions, and to the different aptitudes of women and men.     

Word-list-learning performance in younger and older adults: intra-individual performance variability and false memory

We investigated the word-list-learning performance of younger and older adults over 4 consecutive days at different times of day to study age-related differences in consistency of performance over time and the influence of circadian variation on performance. Eighteen younger (M age, 23.4 years) and 18 older (M age, 73.3 years) men and women participated. The start time of testing alternated between morning and early evening across the 4 days of testing. On each test day, participants learned a different list of 15 unrelated words over four learning trials. As expected, younger adults performed better than older adults on immediate recall, delayed recall, and recognition. Contrary to our expectations, time of day did not significantly influence recall or recognition performance in either the older or younger adults. Older adults did show a greater incidence of false memory (i.e., previously learned list intrusions in free recall and false alarms in recognition) than younger adults. Older adults also exhibited greater intra-individual performance variability on the measures of false memory across test days. This variability was not related to circadian variation. False memory and variability of performance have both been linked to frontal systems dysfunction. The findings presented here are consistent with the notion that changes in cognition with aging in part reflect age-related decline in frontal lobe function.     

Information about foregone rewards impedes dynamic decision-making in older adults

“Making an informed decision” implies that more information leads to better decisions, yet it may be the case that additional information biases decisions in a systematic and sometimes detrimental manner. In the present study, we examined the effect of additional information on older adults’ decision-making using a task for which available rewards were dependent on the participant’s recent pattern of choices. The optimal strategy was to forego the immediately rewarding option in favor of the option that yielded larger delayed reward. We found that providing information about true foregone rewards – the reward that would have been received had the participant chosen the other option – significantly reduced older adults’ decision-making performance. However, false foregone rewards – foregone rewards manufactured to make the long-term option appear more immediately rewarding – led older adults to perform at a level equal to younger adults. We conclude that providing information about foregone rewards biases older adults toward immediate rewards at a greater rate than younger adults, leading to poorer older adult performance when immediate rewards and long-term rewards conflict, but intact performance when immediate rewards and long-term rewards appear to align.     

DISCOUNTING OF DELAYED REWARDS:

Abstract— In this study, children, young adults, and older adults chose between immediate and delayed hypothetical monetary rewards The amount of the delayed reward was held constant while its delay was varied All three age groups showed delay discounting, that is, the amount of an immediate reward judged to be of equal value to the delayed reward decreased as a function of delay The rate of discounting was highest for children and lowest for older adults, predicting a life-span developmental trend toward increased selfcontrol Discounting of delayed rewards by all three age groups was well described by a single function with agesensitive parameters (all R²s>94) Thus, even though there are quantitative age differences in delay discounting, the existence of an age-invanant form of discount function suggests that the process of choosing between rewards of different amounts and delays is qualitatively similar across the life span