Determination of a behavioral transfer function: White-noise analysis of session-to-session response-ratio dynamics on concurrent VI VI schedules

Six pigeons were exposed to concurrent variable-interval schedules in which the programmed reinforcer ratios changed from session to session according to a pseudorandom binary sequence. This procedure corresponded to the stochastic identification paradigm (“white-noise experiment”) of systems theory and enabled the relation between log response ratios in the current session and log reinforcer ratios in all previous sessions to be determined. Such dynamic relations are called linear transfer functions. Both nonparametric and parametric representations of these, in the form of “impulse-response functions,” were determined for each bird. The session-to-session response ratios resulting from the session-to-session pseudorandom binary variations in reinforcer ratios were well predicted by the impulse-response functions identified for each pigeon. The impulse-response functions were well fitted by a second-order dynamic model involving only two parameters: a time constant and a gain. The mean time constant was 0.67 sessions, implying that the effects of abrupt changes in log reinforcer ratios should be 96% complete within about five sessions. The mean gain was 0.53, which was surprisingly low inasmuch as it should equal the sensitivity to reinforcement ratio observed under steady-state conditions. The same six pigeons were subjected to a similar experiment 10 months following the first. Despite individual differences in impulse-response functions between birds within each experiment, the impulse-response functions determined from the two experiments were essentially the same.     

论构成的主体性与意动的主体性

先验主体性与客体性尽管在概念上相互对峙,但作为人类经验与实践的出发点,它们在运作上却从一开始就是浑然一体的。构成主体性是让在时空中对象化了的客体呈现在主体面前并获得意义的意向结构,意动主体性却是让主体获得目的性并将目的在与客体的相互作用中对象化的意向结构。在构成主体性和意动主体性之间的互动中协辩理性的介入,是使规范伦理学有可能在交互主体性的平台上展开的先决条件。     

综合性大学开设长学制高等医学教育的初步研究

我国现有的医学教育学制偏短,不利于培养高质量医学人才。综合性大学有着许多办学优势,有利于开设长学制医学教育,因此,要发挥综合性大学的优势,实行多通道办学模式,学分制和弹性学制,强化公共基础教育和人文素质教育,改善办学条件,提高管理水平,努力培养能参与国际竞争的高层次医学人才。     

Pluralism and values in education in Hungary – changes between 1990 and 2012

Value transmission is a fundamental task of schools. However, the question arises as to how far prevailing political and social conditions shape the functioning of a country or a region’s school system. In other words: what effect do they have on the choice of values to be transmitted at schools? Are there any fundamental social values that are shared by different cultures at different times? Are there values that exist independently of social and political systems? These questions have a special relevance in Eastern and Central European countries like Hungary where political and social changes in the twentieth century had a crucial effect on the set of values that were transmitted by the school system. The aim of this study is to describe how the value transmitting role of the Hungarian school system has changed as a consequence of political transformations in recent decades.     

"庆历易学"发微

"庆历易学"指庆历前后学坛易学,以往学界对这个易学派别未加注意,实际上该学派在易学史上占有重要的地位,它开宋易系统之先河.首先,"庆历易学"开宋学重<易>风气之先.其次,"庆历易学"开宋易系统解<易>风气之先.最后,"庆历易学"开纯以儒家义理解<易>风气之先."庆历易学"重<易>、解<易>风气的实质是学术范式的转换."庆历易学"是以范仲淹为核心的学者集团共同作用的结果.     

干预胆碱M受体对药物成瘾的影响及其与多巴胺的关系

药物成瘾是一类精神及行为障碍, 涉及到中枢神经系统的病变。毒蕈碱受体(Muscarinic receptor, M受体)属于胆碱能受体, 分5种亚型。行为学研究表明, 干预M受体能有效影响药物成瘾行为, 但其神经机制还亟待探索。阿片类药物与精神活性药物均能激活中枢多巴胺系统, 而M受体与多巴胺系统在多个脑区产生了交互作用。其中激动M2及M4受体抑制了多巴胺系统功能, 而激动M5受体增强了多巴胺系统功能, 与干预M2、M4、M5受体对药物成瘾行为的影响相对应。以上证据提示, 干预M受体可能通过影响多巴胺系统对药物成瘾起作用。     

欧美生命伦理委员会的机构建设与咨询服务

在当今国际世界,生命伦理学已经发展成一种国际性的“社会运动”,成为学术界和公众关注的热点领域。在欧美国家健全和完善现代医疗保健制度过程中,“生命伦理委员会”起到至关重要的作用,它不仅促使人们从伦理学角度探索“我/我们应当如何决定和行为”的问题,也推动社会从制度建构和文化塑造层面回答“政府应当如何行为”、“如何增进公民的生命伦理意识”等问题,并从哲学领域深入探索如何应对生命伦理学理论与实践中的复杂问题与困境,论证相关伦理选择及其实践的合理性。20世纪60年代以来,欧美社会生命伦理学在机构建设、咨询服务和思维方式等方面的经验可以为中国生命伦理学学科发展及生命伦理委员会建设提供有益的参考。     

A logic for deontic dilemmas

The possibility of deontic dilemmas poses a significant problem for deontic logic. Here I review some proposals to resolve this problem, and then offer a new account. This is a simple modification of standard deontic logic that enables the system to accommodate deontic dilemmas without inconsistency and without deontic explosion, while at the same time accounting for the range of genuinely valid inferences.     

Pubertal status associations with reward and threat sensitivities and subcortical brain volumes during adolescence

Adolescence is characterized by complex developmental processes that impact behavior, biology, and social functioning. Two such adolescence-specific processes are puberty and increases in reward sensitivity. Relations between these processes are poorly understood. The present study focused on examining unique effects of puberty, age, and sex on reward and threat sensitivities and volumes of subcortical brain structures relevant for reward/threat processing in a healthy sample of 9–18 year-olds. Unlike age, pubertal status had a significant unique positive relationship with reward sensitivity. In addition, there was a trend for adolescent females to exhibit higher threat sensitivity with more advanced pubertal development and higher reward and threat sensitivity with older age. Similarly, there were significant puberty by sex interaction effects on striatal volumes, i.e., left nucleus accumbens and right pallidum. The present pattern of results suggests that pubertal development, independent of chronological age, is uniquely associated with reward hypersensitivity and with structural differences in striatal regions implicated in reward processing.     

身体映像影响因素的生态系统分析

身体映像对个体的身心发展有重要的意义, 对它的研究在近20年来更是如火如荼地发展。根据布朗芬布伦纳的生态系统理论, 从微系统(父母、同伴、伴侣)、外系统(媒体)、宏系统(社会文化)以及处于系统中的个体因素四个方面, 对影响身体映像的因素进行初步的分类和归纳, 为身体映像的干预措施提供参考。