Near-death experiences among survivors of the 1976 Tangshan earthquake

We interviewed 81 survivors of the severe earthquake in Tangshan in 1976 and found that 32 (40 percent) reported near-death experiences (NDEs) as measured by Greyson's (1983) NDE Scale. The great majority of these NDEs were of the cognitive and transcendental types, and our observations were somewhat different from those of Greyson (1985) in the United States and of Pasricha and Stevenson (1986) in India. These differences suggest that the components, sequences, and types of NDE might differ with race, religion, psychological and cultural background, and kind of near-death event.     

Inhibition of Intermediate-Term Memory Following Passive Avoidance Training in Neonate Chicks by a Presynaptic Cholinergic Blocker

The effects of a specific presynaptic cholinergic antagonist, toosendanin, on memory formation following a passive avoidance training experience in day-old chicks was investigated. Bilateral injection of toosendanin into the neostriatal/hyperstriatal region of the chick forebrain produced memory impairment in a dose-dependent manner. Retention deficits were apparent from 20 min following training in chicks treated with toosendanin, regardless of the injection time relative to training. Chicks that received injections of the drug at corresponding times prior to retention tests showed normal retention levels, suggesting that toosendanin has no effect on performance and memory retrieval. These results indicate an involvement of cholinergic transmission during an early stage of memory formation.     

从人脑到计算机─—鸿沟能否逾越

人类对人脑及其精神活动过程的彻底了解,意味着哲学上的根本性事件的发生。所谓彻底的了解,标志就是人类对这种精神活动的成功模拟和再现。作为神经科学的分支和广延的人工智能的兴起,使人类有理由希望：存在于人脑与计算机之间的鸿沟终将被人类逾越。     

儿童运用归纳法概括句组内词语能力的实验研究

本研究的目的是探讨儿童概括词语能力的发展问题。实验材料是9组分别有一、二或三个词语(“因素”)的句子,要求被试概括这些句组。被试是9至12岁以及8.5岁的小学生,每个年龄组有30人,共计150名小学生。 实验结果表明:儿童概括词语能力的发展并不与年龄的增长完全一致,在速度和等级方面其发展是不同的。在8.5-9岁以及11-12岁两个年龄组间差异是显著的,而在其他的年龄组,这种能力的发展是缓慢的。每个年龄组概括的广度也是不同的。     

Signaling Mechanisms Mediating BDNF Modulation of Synaptic Plasticity in the Hippocampus

Although recent studies indicate that brain-derived neurotrophic factor (BDNF) plays an important role in hippocampal synaptic plasticity, the underlying signaling mechanisms remain largely unknown. Here, we have characterized the signaling events that mediate the BDNF modulation of high-frequency synaptic transmission. Mitogen-associated protein kinase (MAPK), phosphotidylinositol-3 kinase (PI3K), and phospholipase C-γ (PLC-γ) are the three signaling pathways known to mediate neurotrophin signaling in other systems. In neonatal hippocampal slices, application of BDNF rapidly activated MAPK and PI3K but not PLC-γ. BDNF greatly attenuated synaptic fatigue at CA1 synapses induced by a train of high-frequency, tetanic stimulation (HFS). Inhibition of the MAPK and PI3K, but not PLC-γ, prevented the BDNF modulation of high-frequency synaptic transmission. Neurotrophin-3 (NT-3), a close relative of BDNF, did not activate MAPK or PI3K and had no effect on synaptic fatigue in the neonatal hippocampus. Neither forskolin, which activated MAPK but not PI3 kinase, nor ciliary neurotrophic factor (CNTF), which activated PI3K but not MAPK, affected HFS-induced synaptic fatigue. Treatment of the slices with forskolin together with CNTF still had no effect on synaptic fatigue. Thus, although the activation of MAPK and PI3K is required, the two together are not sufficient to mediate the BDNF effect. Inhibition of new protein synthesis by anisomycin or cycloheximide did not prevent the BDNF effect. These data suggest that BDNF modulation of high-frequency transmission is independent of protein synthesis but requires MAPK and PI3K and yet another signaling pathway to act together in the hippocampus.     

Gender and Sexual Risk

Two hypotheses are evaluated in thisinvestigation of gender differences in the attitudinaland behavioral correlates of sexual risk. Thedifference in magnitude hypothesispredicts that the same factors are implicated for women and men butdifferences occur in the strength of correlates.Alternatively, women may engage in sexual risk fordifferent reasons than do men, leading to adifference in pattern hypothesis. We compared these possibilitieswith a sample of 576 primarily White, middle-class,never-married college students, most of whom werebetween 17 and 25 years of age. Analyses of loveattitudes, risk perception, sensation seeking, and riskbehaviors in other domains in relation to sexual riskbehavior showed some gender similarities as well asdifferences. Findings were more consistent with the difference in pattern hypothesis than with thedifference in magnitude hypothesis.     

指向具体人物对象的人际信任:跨文化比较及其认知模型

本文对指向具体人物对象的人际信任作了跨文化实证比较研究,并探讨了人际信任的认知模型。使用人际信任行为量表(ITBS)测量了中国、香港及美国三地大学生的人际信任。根据三组被试对诸如父亲、哥哥、同班同学、医生和陌生人等20个人们生活中经常能够接触的人物信任程度的高低,可将这些具体人物对象归为“亲人”,“熟人”和“陌生人”三个群体。三组被试对“亲人”群体的人际信任没有显著差异,但中国被试对其它两个人物对象群体的信任要高于美国和香港被试,而后两组被试的差别则不显著。另外,利用多元回归法在人际信任与六种认知变量间建立了模型关系,发现其中只有两个变量对模型作出主要贡献,即:(1)对由信任行为而得到得回报的期望值越高;(2)得不到回报而引致损害的严重性评估越低,则一个人作出某一信任行为的可能性就越大。被试的文化背景和社会工业化程度对人际信任认知模型没有影响。     

算法决策趋避的过程动机理论

算法常用于决策, 但相较于由人类做出的决策, 即便内容相同, 算法决策更容易引起个体反应的分化, 此即算法决策趋避。趋近指个体认为算法的决策比人类的更加公平、含有更少的偏见和歧视、也更能信任和接受, 回避则与之相反。算法决策趋避的过程动机理论用以解释趋避现象, 归纳了人与算法交互所经历的原初行为互动、建立类社会关系和形成身份认同三个阶段, 阐述了各阶段中认知、关系和存在三种动机引发个体的趋避反应。未来研究可着眼于人性化知觉、群际感知对算法决策趋避的影响, 并以更社会性的视角来探究算法决策趋避的逆转过程和其他可能的心理动机。     

Navigating uncertainty in human social decision-making: Consequences and coping strategies

Uncertainty is a fundamental aspect of human social life. Based on fruitful findings, the current review aims to establish a schema that outlines the relationship between uncertainty and human social decision-making: the influences of uncertainty on social decision-making (mainly prosocial behaviors) and the strategies commonly employed to reduce social uncertainty. Human prosocial behaviors are modulated by both social and nonsocial uncertainty. Specifically, uncertainty decreases prosocial behaviors by providing moral wiggling room or promoting loss aversion but also helps maintain relationships by mitigating negative interactions. Moreover, impression formation, impression updating, and compliance with social norms are crucial strategies for coping with social uncertainty, but they are subject to various biases. Finally, we highlight some important issues that need to be addressed in future studies. In summary, the current review deepens our understanding of the role of uncertainty in social behaviors.