What Truth Depends on

What kinds of sentences with truth predicate may be inserted plausibly and consistently into the T-scheme? We state an answer in terms of dependence: those sentences which depend directly or indirectly on non-semantic states of affairs (only). In order to make this precise we introduce a theory of dependence according to which a sentence φ is said to depend on a set Φ of sentences iff the truth value of φ supervenes on the presence or absence of the sentences of Φ in/from the extension of the truth predicate. Both φ and the members of Φ are allowed to contain the truth predicate. On that basis we are able define notions such as ungroundedness or self-referentiality within a classical semantics, and we can show that there is an adequate definition of truth for the class of sentences which depend on non-semantic states of affairs.     

易感人格的工作记忆特征对药物成瘾的调节机制

药物成瘾是指持续使用成瘾药物, 出现耐受性和戒断症状并严重阻碍正常社会功能的精神疾病。工作记忆在调节药物成瘾行为中扮演了中心角色：在神经易感性和易感人格特质基础上, 低工作记忆容量导致危险决策和去抑制性, 进而影响寻求药物和复吸行为。目前的研究基于已经产生成瘾的个体, 无法区别神经易感性、人格特质以及工作记忆缺陷是药物成瘾的原因还是结果; 而且, 仅从认知角度研究药物成瘾的原因, 会忽视该行为受多个因素影响的事实。     

镜像神经在药物心理渴求中的作用及机制

心理渴求是物质依赖者希望重新感受神经活性药物效应的渴望,其神经机制的早期影像研究,主要集中在前额皮质和奖赏中枢.镜像神经是新近发现的位于动作脑区,能理解、分析所观察动作的目的和性质,并通过内隐模拟,产生直接映射式的情绪和认知的神经.最新的研究发现尼古丁成瘾者在相关线索的刺激下,其镜像神经也能被激活.本研究旨在探索镜像神经参与相关线索下心理渴求形成的机制,为发展更可靠的依赖行为的生物学标记提供另一个重要目标,帮助人们更好地理解药物渴求形成的神经生物学基础与过程.     

父母因素、抵制效能感与青少年新媒介依赖行为的关系

以500名青少年手机拥有者为被试,采用问卷调查法考察青少年新媒介依赖(包括网络和手机依赖)的特点,并探讨父母因素和抵制效能感对青少年新媒介依赖的预测作用。结果发现:(1)40%的青少年至少存在边缘网络成瘾行为,19.8%的青少年为手机依赖者。青少年网络成瘾和手机依赖这两种新媒介依赖行为间具有显著的关联性,46.4%的青少年存在至少一种新媒介依赖行为。(2)青少年新媒介依赖行为与其抵制效能感、父母行为/态度及父母行为监控显著相关。青少年抵制效能感在父母行为/态度与青少年新媒介依赖行为之间起到完全中介的作用,在父母行为监控与青少年新媒介依赖行为间起到部分中介的作用。研究结果对提高青少年新媒介依赖行为预防干预活动的有效性和针对性具有重要的指导意义。     

注意对拓扑性质和局部几何性质检测的不同影响──进一步的实验证据

实验研究了中央和外周提示信号对辨别朝向的任务（局部几何性质检测）和辨别有或无的任务（拓扑性质检测）的影响。结果表明,对于两种提示信号,在提示有效和提示无效条件下,辨别有或无比辨别朝向具有较短的反应时和较低的错误报告率;辨别朝向的ＲＴ和错误报告率都受提示信号的影响;而对于辨别有或无的任务,只有ＲＴ受提示信号的影响;提示信号对辨别朝向的影响比辨别有或无的影响大。本实验排除了对Ｈａｎ和Ｃｈｅｎ的实验的可能的光通量解释,并为提示信号对不同几何性质检测的不同影响提供了进一步的实验证据。     

Local Food Environments: They’re All Stocked Differently

The obesity epidemic has widened the aims of prevention research to include the influence of local food environments on health outcomes. This mixed methods study extends existing research focused on local food environments by examining whether community members’ find food accessible. Data from food store audits and one-on-one interviews were analyzed. Results reveal that most of the food stores surrounding the three research sites were convenience stores and non-chain grocery stores; interviewees did not perceive these stores to be “real” food stores. Tobacco and alcohol products were more prevalent in the food stores than all varieties of milk, fresh fruits, or fresh vegetables. Food access varied by site in a manner that was designed to appeal to customers’ race, class, gender, or environment. Findings reveal that local food environments are reflections of social hierarchies. Unraveling the politics of space ought to be a part of broader efforts to promote the public’s health.     

Assessment of Nicotine Dependence Among Substance Abusing Adolescent Smokers: A Comparison of the DSM-IV Criteria and the Modified Fagerström Tolerance Questionnaire

Nicotine dependence has been found to be a significant factor in adolescent smoking persistence. However, measures of this construct are primarily adult-derived, limiting their utility as bases for characterizing nicotine dependence and formulating youth intervention strategies. This issue is of particular importance among substance abusing youth who have substantially higher rates of cigarette smoking than do adolescents in the general population. The objectives of this preliminary study were to examine the construct validity of the DSM-IV nicotine dependence criteria and the modified Fagerström Tolerance Questionnaire (mFTQ) and to compare the DSM-IV diagnostic criteria for nicotine dependence with the mFTQ in a sample of 67 adolescent smokers in treatment for substance abuse. Results revealed that more participants were classified as nicotine dependent using DSM-IV criteria than by mFTQ scores. Little evidence was found for construct validity of these measures and convergence between the two measures was low. Findings also suggested that the present measures do not capture optimally broad dimensions of adolescent nicotine dependence.     

背景性渴求与事件性渴求:区分心理渴求对尼古丁成瘾的不同作用路径

大量研究发现心理渴求机制的紊乱是尼古丁成瘾的核心机制之一。线索暴露是探索心理渴求与尼古丁成瘾关系的重要研究范式。但最近研究者提出该范式较难区分事件性渴求与背景性渴求,导致无法清楚定位渴求在尼古丁成瘾中扮演的角色。通过对以往文献的回顾,对不同成瘾概念、作用机制和生理基础进行对比分析,认为事件性渴求与背景性渴求两者在维持成瘾行为上的确存在不同的作用路径。未来研究应改进实验范式,分别探讨两种心理渴求与尼古丁成瘾的内在联系,完善心理渴求与尼古丁成瘾的关系模型,为尼古丁成瘾的治疗和干预等方法提供一定的理论依据。