The phenomenon of probability backflow, previously quantified for a free nonrelativistic particle, is considered for a free particle obeying Dirac's equation. It is shown that probability backflow can occur in the opposite direction to the momentum; that is to say, there exist positive-energy states in which the particle certainly has a positive momentum in a given direction, but for which the component of the probability flux vector in that direction is negative. It is shown that the maximum possible amount of (...) probability that can flow “backwards,” over a given time interval of duration T, depends on the dimensionless parameter ε = (4ℏ/mc2T)1/2, where m is the mass of the particle and c is the speed of light. At ε = 0, the nonrelativistic value of approximately 0.039 for this maximum is recovered. Numerical studies suggest that the maximum decreases monotonically as ε increases from 0, and show that it depends on the size of m, ℏ, and T, unlike the nonrelativistic case. (shrink)

People live and age together in social groups. Across a range of outcomes, research has identified interdependence in the cognitive and health trajectories of ageing couples. Various types of memory decline with age and people report using a range of internal and external, social, and material strategies to compensate for these declines. While memory compensation strategies have been widely studied, research so far has focused only on single individuals. We examined interdependence in the memory compensation strategies reported by spouses within (...) 58 older couples. Couples completed the Memory Compensation Questionnaire, as well as an open-ended interview about their memory compensation practices. We found that internal, intra-individual memory compensation strategies were not associated within couples, but external, extra-individual strategies showed interdependence. Individuals’ scores on material/technological compensation strategies were positively correlated with their partners’. Reported reliance on a spouse was higher for men and increased with age. Our open-ended interviews yielded rich insights into the complex and diverse resources that couples use to support memory in day-to-day life. Particularly evident was the extent of interaction and coordination between social and material compensation, such that couples jointly used external compensation resources. Our results suggest that individuals’ reports of their compensation strategies do not tell the whole story. Rather, we propose that older couples show interdependence in their memory compensation strategies, and adopt complex systems of integrated material and social memory compensation in their day-to-day lives. (shrink)

The National Library of Finland and the Von Wright and Wittgenstein Archives at the University of Helsinki keep the collected correspondence of Georg Henrik von Wright, Wittgenstein’s friend and successor at Cambridge and one of the three literary executors of Wittgenstein’s Nachlass. Among von Wright’s correspondence partners, Elizabeth Anscombe and Rush Rhees are of special interest to Wittgenstein scholars as the two other trustees of the Wittgenstein papers. Thus, von Wright’s collections held in Finland promise to shed light on the (...) context of decades of editorial work that made Wittgenstein’s later philosophy available to all interested readers. In this text, we present the letters which von Wright received from Anscombe and Rhees during the first nine months after Wittgenstein’s death. This correspondence provides a vivid picture of the literary executors as persons and of their developing relationships. The presented letters are beautiful examples of what the correspondence as a whole has to offer; it depicts – besides facts of editing – the story of three philosophers, whose conversing voices unfold the human aspects of inheriting Wittgenstein’s Nachlass. Their story does not only deal with editing the papers of an eminent philosopher, but with the attempt to do justice to the man they knew, to his philosophy and to his wishes for publication. (shrink)

A meta-analytic review of studies that experimentally elicited awe and compared the emotion to other conditions (84; 487 effects; 17,801 participants) examined the degree to which experimentally elicited awe (1) affects outcomes relative to other positive emotions (2) affects experience, judgment, behaviour, and physiology, and (3) differs in its effects if the awe state was elicited through positive or threatening contexts. The efficacy of methods that have been used to experimentally elicit awe and the possibility of assessing changes in the (...) state of the self with experimental awe elicitations were also examined. Meta-analyses with robust variance estimation revealed that awe affected outcomes compared to other positive emotions and control conditions; affected experience, judgment, and behaviour; and had similar effects if elicited through positive or threatening contexts. The ability to compare awe to negative emotion states and its effects on physiology was limited by a small number of available effects. Images, videos, autobiographical recall, and naturalistic exposure were effective in eliciting awe. Exploratory analyses suggested that some processes involved in changes in the self can be related to experimental awe elicitations. These findings suggest awe is a discrete emotion and identifies areas for future investigation. (shrink)

Although the role of emotion in socioeconomic decision making is increasingly recognised, the impact of specific emotional disorders, such as anxiety disorders, on these decisions has been surprisingly neglected. Twenty anxious patients and twenty matched controls completed a commonly used socioeconomic task (the Ultimatum Game), in which they had to accept or reject monetary offers from other players. Anxious patients accepted significantly more unfair offers than controls. We discuss the implications of these findings in light of recent models of anxiety, (...) in particular the importance of interpersonal factors and assertiveness in an integrated model of decision making. Finally, we were able to show that pharmacological serotonin used to treat anxious symptomatology tended to normalise decision making, further confirming and extending the role of serotonin in co-operation, prosocial behaviour, and social decision making. These results show, for the first time, a different pattern of socioeconomic behaviour in anxiety disordered patients, in addition to the known memory, attentional and emotional biases that are part of this pathological condition. (shrink)

We link Ivancovsky et al.'s novelty-seeking model (NSM) to computational models of intrinsically motivated behavior and learning. We argue that dissociating different forms of curiosity, creativity, and memory based on the involvement of distinct intrinsic motivations (e.g., surprise and novelty) is essential to empirically test the conceptual claims of the NSM.

We comment on the proposition “that lower temperatures and especially greater seasonal variation in temperature call for individuals and societies to adopt … a greater degree of self-control” (Van Lange et al., sect. 3, para. 4) for which we cannot find empirical support in a large data set with data-driven analyses. After providing greater nuance in our theoretical review, we suggest that Van Lange et al. revisit their model with an eye toward the social determinants of self-control.

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Philosophy 41.4 (2003) 561-562 [Access article in PDF] Gianni Paganini, Miguel Benítez, and James Dybikowski, editors. Scepticisme, Clandestinité et Libre Pensée. Paris: Honoré Champion, 2002. Pp. 382. Cloth, €60.00. This book consists of papers from two Tables rondes held in Dublin in 1999 on the occasion of the Tenth International Congress on the Enlightenment. The contributors are: Paganini, Benítez, Dybikowski, Alan Charles Kors, Winfried (...) Schröder, José R. Maia Neto, Adam Sutcliffe, Justin Champion, Antony McKenna, Lorenzo Bianchi, Christine Berkvens-Stevelinck, Pierre Lurbe, Stephen David Snobelen, Nigel Aston, and Stuart Brown. There is remarkably little overlap among the papers and Paganini has clearly insisted on very [End Page 561] high standards. Because of space limitations, I shall focus on several of the general themes which run through the book rather than on individual contributions.Despite the phenomenal success Richard Popkin and collaborators like the late Charles B. Schmitt, Giorgio Tonelli, and Ezequiel de Olaso have had in documenting the amazing impact of skepticism in the Renaissance and in the years up to the Enlightenment, this volume demonstrates that skepticism, that many-faceted force, continued throughout the eighteenth-century Enlightenment. After Bayle, and the application of his special forms of skepticism to theological topics—forms which were often employed, contrary to Bayle's probable intentions, in defense of atheism—skepticism went "underground." A large variety of literature was circulated in manuscript form, the clandestine literature of the period. The lesson which this conference celebrates is that skepticism did not cease being a major cultural force. Thus there is, thanks to the philosophical dimension of the clandestine literature in the eighteenth century, a transition from Christian rationalism to an anti-Christian rationalism.Major figures of the Enlightenment were, of course, well-acquainted with skepticism, e.g., Berkeley, Voltaire, Hume, Crousaz, Condillac, Reid, and Kant. Not surprisingly, the major topics discussed in these papers center around skepticism, fideism and atheism, proofs for the existence of God, and the status of the "preambles" to the faith. These all receive careful attention. The tension between the arguments for Christian Pyrrhonism versus anti-Christian rationalism runs through many of these papers. And of course Bayle's points of view on both sides of the Christian debate appear in much of the clandestine literature. The matter of the immortality of the soul is carefully discussed. What is the status of this doctrine? Is it a question of Church dogma or is it another belief to be discarded in the light of reason?The connection perceived to hold between atheism and political legitimacy are explored in several papers. In the seventeenth century, Locke would exclude atheists from the body politic, in part because they were unable to truthfully swear an oath. Atheists were perceived as a danger for many eighteenth-century figures and the political need to suppress atheism was widely understood and accepted by those in the various religious establishments. Bayle's two-century-old attempt to break the putative logical tie between morality and religion failed in his own day, and despite the efforts of the authors of clandestine philosophical literature, the intimate link Bayle tried to break seems to be stronger than ever in much of the world today. It is interesting that the United States is virtually the only industrial and democratic society in which atheists are virtually precluded from being political candidates in federal, and probably most local, elections. Among other things, the papers in this volume help one to understand just how difficult breaking free from theological constraints in the interest of political freedom has proved to be. Harry McFarland Bracken Arizona State University, Tempe... (shrink)

Background: Positive effects of acute exercise on cognitive performances in general inspired research that investigated the effects of acute exercise on specific cognitive subdomains. Many existing studies examined beneficial effects of acute exercise on subsequent set shifting performance in healthy adults. Set shifting, a subdomain of executive function, is the ability to switch between different cognitive sets. The results of existing studies are inconsistent. Therefore, a meta-analysis was conducted that pooled available effect sizes. Additionally, moderator analyses were carried out to (...) identify covariates that determine the magnitude of exercise-induced set shifting benefits.Methods: Medline, PsycINFO, and SPORTDiscus were searched for eligible studies. Hedges' g corrected standardized mean difference values were used for analyses. Random-effects weights were applied to pool effects. Potential moderation of the effect of acute exercise on subsequent set shifting performance by exercise intensity, type of exercise, participants' age, and type of control group were examined.Results: Twenty-two studies were included into analysis. All aggregated effect sizes ranged from small to moderate. Overall, a small significant beneficial effect was revealed. Heterogeneity of included effect sizes was moderate and significant. Moderator analyses revealed a larger average effect in older adults than for studies examining younger adults. Light exercise led to larger effects than moderate or vigorous exercise. Studies testing acute exercise against active control groups showed a noticeably smaller average effect than studies that used passive or cognitive engaging control groups. Interestingly, application of resistance or aerobic exercise led to no different average effect sizes. However, none of the tested covariates reached statistical significance.Conclusion: Acute exercise improves subsequent set shifting performance. However, effect sizes are small, making the relevance for everyday life questionable. The results indicate that older adults benefit more from acute exercise than younger adults do. Light intensity exercise seems most effective while the type of exercise does not seem to influence the magnitude of effects. Research designs with active control groups show the smallest average effect, raising concerns about placebo effects.PROSPERO registration number: CRD42019138799. (shrink)

In this work, we present a multi-agent logic of knowledge and change of knowledge interpreted on topological structures. Our dynamics are of the so-called semi-private character where a group G of agents is informed of some piece of information $$\varphi $$ φ, while all the other agents observe that group G is informed, but are uncertain whether the information provided is $$\varphi $$ φ or $$\lnot \varphi $$ ¬φ. This article follows up on our prior work where the dynamics were (...) public events. We provide a complete axiomatization of our logic, and give two detailed examples of situations with agents learning information through semi-private announcements. (shrink)

Three separate churches erected in Constantinople were all dedicated to the wisdom of Christ and erected on the same site one after the other. These churches were built between 360 and 537 AD by three different emperors: Constantius II, Theodosius the Younger, and Justinian I. The first two churches were consumed in flames after relatively short lives, but the final and greatest church still stands today, despite a history of extensive damage. This final edifice is the main focus of this (...) paper, owing to its 1500 year longevity and unprecedented architecture. If the entire History of Justinian's church is to considered, it is inaccurate to refer to it as a “church,” because although it remained a church for the first 900 years after its audacious construction, it was later converted into a mosque. Today it is a museum, in remembrance of its long history. (24). (shrink)

In this work, we present a multi-agent logic of knowledge and change of knowledge interpreted on topological structures. Our dynamics are of the so-called semi-private character where a group G of agents is informed of some piece of information \, while all the other agents observe that group G is informed, but are uncertain whether the information provided is \ or \. This article follows up on our prior work where the dynamics were public events. We provide a complete axiomatization (...) of our logic, and give two detailed examples of situations with agents learning information through semi-private announcements. (shrink)

Antipathy towards the possibility that God exists is a common attitude, which has recently been clearly expressed by Thomas Nagel. This attitude is presumably irrelevant to the question whether God does exist. But it raises two other interesting philosophical issues. First, to what extent does this attitude motivate irrational belief? And secondly, how should the attitude be evaluated? This paper investigates that latter issue. Is the hope that God does not exist a morally proper hope? I simplify this question by (...) interpreting the relevant attitude as an aversion towards the Christian picture of the world coupled with a preference for the naturalist atheistic picture. And comparing the content of those two world pictures, I argue that the attitude, though partly explicable, is morally unjustifiable, for clearly recognisable reasons. Regardless, then, of further concerns about the doxastic influence of this attitude, we ought to be ashamed of our antipathy to God, which reflects badly upon us. (shrink)

The need to make young scientists aware of their social responsibilities is widely acknowledged, although the question of how to actually do it has so far gained limited attention. A 2-day workshop entitled “Prepared for social responsibility?” attended by doctoral students from multiple disciplines in climate science, was targeted at the perceived needs of the participants and employed a format that took them through three stages of ethics education: sensitization, information and empowerment. The workshop aimed at preparing doctoral students to (...) manage ethical dilemmas that emerge when climate science meets the public sphere (e.g., to identify and balance legitimate perspectives on particular types of geo-engineering), and is an example of how to include social responsibility in doctoral education. The paper describes the workshop from the three different perspectives of the authors: the course teacher, the head of the graduate school, and a graduate student. The elements that contributed to the success of the workshop, and thus make it an example to follow, are (1) the involvement of participating students, (2) the introduction of external expertise and role models in climate science, and (3) a workshop design that focused on ethical analyses of examples from the climate sciences. (shrink)

The article aims to develop the philosophy of Emmanuel Levinas as a valuable new perspective in understanding the triune drama of the Resurrection. Firstly, the juxtaposition of Levinas’ thought and Christian theology will be argued for, followed by a development of von Balthasar’s Trinitarian theology of the Resurrection. Especially, Levinas’ non-phenomenological notion of “otherness” will be used to offer an understanding of the Risen Christ’s “Otherness” as communicating the non-phenomenality of Holy Saturday to the disciples. As a result, we discover (...) significant theological openings towards a vision of a Biblical God free from the constraints of ontological thinking and phenomenal experience. (shrink)

This paper examines the implications and challenges of Odera Oruka’s conversation approach to the study of contemporary African philosophy as enunciated in his “Philosophic sagacity”. In Oruka’s method, African philosophy is conceived as a joint venture and product of both the ancient and modern Africanphilosophers. Consequently, it utilizes interview, discussion and dialogue.