A geo-logical solution to the lottery paradox, with applications to conditional logic

We defend a set of acceptance rules that avoids the lottery paradox, that is closed under classical entailment, and that accepts uncertain propositions without ad hoc restrictions. We show that the rules we recommend provide a semantics that validates exactly Adams?? conditional logic and are exactly the rules that preserve a natural, logical structure over probabilistic credal states that we call probalogic. To motivate probalogic, we first expand classical logic to geo-logic, which fills the entire unit cube, and then we project the upper surfaces of the geo-logical cube onto the plane of probabilistic credal states by means of standard, linear perspective, which may be interpreted as an extension of the classical principle of indifference. Finally, we apply the geometrical/logical methods developed in the paper to prove a series of trivialization theorems against question-invariance as a constraint on acceptance rules and against rational monotonicity as an axiom of conditional logic in situations of uncertainty.     

High neuromagnetic activation in the left prefrontal and frontal cortices correlates with better memory performance for abstract words

The ability to store and manipulate online information may be enhanced by an inner speech mechanism that draws upon motor brain regions. Neural correlates of this mechanism were examined using event-related functional magnetic resonance imaging (fMRI). Sixteen participants completed two conditions of a verbal working memory task. In both conditions, participants viewed one or two target letters. In the “storage” condition, these targets were held in mind across a delay. Then a probe letter was presented, and participants indicated by button press whether the probe matched the targets. In the “manipulation” condition, participants identified new targets by thinking two alphabetical letters forward of each original target (e.g., f → h). Participants subsequently indicated whether the probe matched the newly derived targets. Brain activity during the storage and manipulation conditions was examined specifically during the delay phase in order to directly compare manipulation versus storage processes. Activations that were common to both conditions, yet disproportionately greater with manipulation, were observed in the left inferior frontal cortex, premotor cortex, and anterior insula, bilaterally in the parietal lobes and superior cerebellum, and in the right inferior cerebellum. This network shares substrates with overt speech and may represent an inner speech pathway that increases activity with greater working memory demands. Additionally, an inverse correlation was observed between manipulation-related brain activity (on correct trials) and test accuracy in the left premotor cortex, anterior insula, and bilateral superior cerebellum. This inverse relationship may represent intensification of inner speech as one struggles to maintain performance levels.     

Age-related differences in the brain areas outside the classical language areas among adults using category decision task

Older adults perform much like younger adults on language. This similar level of performance, however, may come about through different underlying brain processes. In the present study, we evaluated age-related differences in the brain areas outside the typical language areas among adults using a category decision task. Our results showed that similar activation patterns were found in classical language processing areas across the three age groups although regional lateralization indices in Broca’s and Wernicke’s areas decreased with age. The greatest differences, however, among the three groups were found primarily in the brain areas not associated with core language functioning including the hippocampus, middle frontal gyrus, ventromedial frontal cortex, medial superior parietal cortex and posterior cingulate cortex. Therefore, the non-classical language areas may exhibit an age-related difference between three age groups while the subjects show a similar activation pattern in the core, primary language processing during a semantic decision task.     

Reevaluating the role of the medial prefrontal cortex in delay eyeblink conditioning

It has been proposed that the medial prefrontal cortex (mPFC) is not necessary for delay eyeblink conditioning (DEC). Here, we investigated the involvement of the mPFC in DEC with a soft or loud tone as the conditioned stimulus (CS) by using electrolytic lesions or muscimol inactivation of guinea pig mPFC. Interestingly, when a soft tone was used as a CS, electrolytic lesions of the mPFC significantly retarded acquisition of the conditioned response (CR), and muscimol infusions into mPFC distinctly inhibited the acquisition and expression of CR, but had no significant effect on consolidation of well-learned CR. In contrast, both electrolytic lesions and muscimol inactivation of mPFC produced no significant deficits in the CR when a loud tone was used as the CS, or in the unconditioned response (UR) when a soft or loud tone was used as the CS. These results demonstrate that the mPFC is essential for the DEC with the soft tone CS but not for the DEC with the loud tone CS.     

Pay It Forward: Gratitude in Social Networks

Based on the framework of the broaden-and-build theory (Fredrickson in Philos Trans R Soc B Biol Sci 359(1449):1367, 2004a, b), we proposed that the emotion of gratitude generates upstream reciprocity (UR, which is helping an unrelated third party after being helped) by broadening the beneficiary’s perspective toward others and thus making the beneficiary represent the benefactor and newly encountered strangers in the same social category. Furthermore, by inducing one UR after another, gratitude may lead to a chain/network of UR and strengthen the structure of organization. We named the effect the integration function of gratitude and demonstrated it by applying the social network analysis technique to eighteen small groups. Implications of the integration function are discussed in terms of self-identity, social exchange theory, and quality of life.     

Forgetting the unforgotten affective autobiographical memories in nonclinical dissociators

Inefficient memory inhibition has been observed in nonclinical and clinical dissociators. Paradoxically, dissociators also report unusual forgetfulness. Investigating how forgetting emerges in dissociators may uncover the antecedents for their self-report memory problems. We postulated that set switch can link inefficient memory inhibition to forgetting. Recollection detour, which involves an affect switch, may elicit forgetting of previously uninhibited memories in nonclinical dissociators. This hypothesis was verified in participants with high- and low-dissociation proneness via a retrieval practice paradigm using positive and negative autobiographical memories. After the study and retrieval-practice phases, memories of the practiced affect category were tested without and with intervening recall of the unpracticed affect category in the control and detour condition, respectively. Nondissociators showed reduced recall in the control condition, replicating the retrieval-induced forgetting (RIF) effect and recollection detour did not alter the RIF effect. By contrast, nonclinical dissociators showed the RIF effect in the detour condition but not in the control condition. Detour to recollecting memories of another affect category rendered an aftereffect of forgetting of previously uninhibited memories in nonclinical dissociators. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

人机互动中的任务中断：新环境中的新问题

任务中断是“R-V”居间系统（“现实-虚拟”居间系统）中的人机互动所要频繁面临和处理的一种现象。任务中断对主任务执行的影响主要有三种情况：消极的、积极的和因情况而异的。对中断延迟期间心理作用机制的研究揭示了中断延迟期间的准备是如何对主任务恢复发生作用的,主要理论包括：任务转换理论,长时工作记忆理论,目标记忆理论和线程认知理论。任务转换理论为中断延迟作用机制的研究提供了基础的模式,目标记忆理论和长时工作记忆理论各自提出了复述和编码两种不同的观点,线程认知理论主张多线程并行,深化了任务中断的研究。未来的研究应关注于研究中断对主任务执行产生不同影响的原因、影响中断任务执行期间复述机会的因素以及中断延迟期间的准备是对信息的复述还是编码。对任务中断理论的综述意义在于使未来有关任务中断的研究更加深入且具有实践意义。     

大学生应对自我效能和学习倦怠的关系：基于主观幸福感的中介效应

采用应对自我效能量表、幸福感指数量表和大学生学习倦怠量表对6所高校的713名大学生进行调查,探讨大学生应对自我效能、主观幸福感和学习倦怠三者之间的关系。结果表明：大学生应对自我效能对其主观幸福感具有显著的正向影响作用,大学生主观幸福感对其学习倦怠具有显著的负向影响作用;大学生主观幸福感在应对自我效能和学习倦怠之间起完全中介作用。研究结果进一步揭示了大学生应对自我效能和对其学习倦怠的影响机制。     

惯例的实证研究进展：心理学的视角

惯例是人们在重复解决同一问题时形成的程序化行为或策略,它既可以从个体,也可以从群体的视角来研究。在心理学中,惯例的研究始于思维定势和内隐学习;近年来,在现代认知心理学的推动下,研究者们已从个体与群体问题解决、决策的视角对它进行了一系列研究;而惯例重复性的特征又为它与重复博弈的交叉研究提供了可能。未来的惯例研究可以在以往研究基础上,从其普遍性和特点、信息搜索、知识迁移等角度展开。