Spatial evolutionary game theory explains how cooperative traits can survive the intense competition in biological systems. If the spatial distribution allows cooperators to interact with each other frequently, the benefits of cooperation will outweigh the losses due to exploitation by selfish organisms. However, for a cooperative behavior to get established in a system, it needs to be found initially in a sufficiently large cluster to allow a high frequency of intracooperator interactions. Since mutations are rare events, this poses the question (...) of how cooperation can arise in a biological system in the first place. We present a simple model which captures two concepts from genetics that can explain how evolution overcomes the emergence problem. The first concept is, often in nature, a gene may not express its phenotype except under specific environmental conditions, rendering it to be a “silent” gene. The second key idea is that a neutral gene, one that does not harm or improve an organism’s survival chances, can still spread through a population if it is physically near to another gene that is positively selected. Through these two ideas, our model offers a possible solution to the fundamental problem of emergence of cooperation in biological systems. (shrink)

Positive frequency dependent selection is a natural selection regime where the fitness of a phenotype increases with its frequency in the population. Examples can be typically found in the spread of disease tolerance strategies in a population. A characterizing feature of PFDS is that the focal allele may experience favorable selection only when it becomes more frequent in the population, while being selected against when it is rare. In this paper, by applying a solution concept from evolutionary game theory, we (...) hypothesize that the process of emergence of such alleles triggers selection for silence, where the emergence of alleles that can stay unexpressed for a period of time will be favored by selection forces. We illustrate our hypothesis using a mathematical model of a population of single locus diploid organisms with two alleles where a single mutant of an allele that experiences positive frequency dependent selection appears in a population where the other allele is a dominant. The model results show that the longer the silence interval of the new mutant before its expression, the better its chances of getting fixed in the population. However, this effect will be observable only to a certain limit after which further increase in the interval will not have an effect on the expected fixation rate. Two divergences from the simple scenario are also investigated: the nonsynchronous expression of the focal allele and its emergence in a spatial grid limited by a migration bottleneck. In all cases, it is shown that there is an evolutionary pressure inherent in the dynamics of positive frequency dependent selection on the genes to have a delayed expression. It is hypothesized that the regulation systems of such traits will be under selection for either internal silencing mechanisms or to be triggered by an external environmental condition. (shrink)

Despite its uniform appearance, the cerebellar cortex is highly heterogeneous in terms of structure, genetics and physiology. Purkinje cells (PCs), the principal and sole output neurons of the cerebellar cortex, can be categorized into multiple populations that differentially express molecular markers and display distinctive physiological features. Such features include action potential rate, but also their propensity for synaptic and intrinsic plasticity. However, the precise molecular and genetic factors that correlate with the differential physiological properties of PCs remain elusive. In this (...) article, we provide a detailed overview of the cellular mechanisms that regulate PC activity and plasticity. We further perform a pathway analysis to highlight how molecular characteristics of specific PC populations may influence their physiology and plasticity mechanisms. (shrink)

These days, the radicalization of young people is above all viewed as a security risk. Almost all research into this phenomenon has been carried out from a legal, criminological or socio-psychological perspective with a focus on detecting and containing the risks posed by radicalization. In the light of the political developments since September 11, 2001, this is entirely understandable but perhaps not altogether wise. Research and theory development from a pedagogical perspective can also make a significant contribution towards a better (...) understanding of radicalization processes and possibly offer new points of departure for intervention strategies. On the basis of five typical cases, the authors examine the role of educators, social workers and teachers, and the problems they face when dealing with young people with extreme ideals. This article attempts to provide insight into the pedagogical conditions for the development of extreme ideals and suggests starting points for developing effective countermeasures. (shrink)

BACKGROUND: Delusions in schizophrenia are commonly approached as empirical false beliefs about everyday reality. Phenomenological accounts, by contrast, have suggested that delusions are more adequately understood as pertaining to a different kind of reality experience. How this alteration of reality experience should be characterised, which dimensions of experiential life are involved, and whether delusional reality might differ from standard reality in various ways is unclear and little is known about how patients with delusions value and relate to these experiential alterations. (...) This study aimed to investigate the nature of delusional reality experience, and its subjective apprehension, in individuals with lived experience of delusions and a schizophrenia-spectrum diagnosis. METHODS: In this qualitative phenomenological study, we recruited individuals with lived experience of delusions and a schizophrenia-spectrum diagnosis from two psychiatric-hospital services in Belgium using homogenous sampling. Criteria for participation were having undergone at least one psychotic episode with occurring delusional symptoms, present at least 1 year before participation, on the basis of clinical notes assessed by the attending psychiatrist; a schizophrenia-spectrum diagnosis, ascertained through clinical interview by the attending psychiatrist upon admission; being aged between 18 years and 65 years; and having the capacity to give informed consent. Exclusion criteria included worries concerning capacity to consent and risk of distress caused by participation. We did phenomenologically driven semi-structured interviews with the participants to explore the nature of delusional reality experience and their subjective valuation of these experiences. We used interpretative phenomenological analysis, a qualitative method tailored to the in-depth exploration of participants’ first-person perspective, to analyse their accounts. FINDINGS: Between March 2, 2020, and Sept 30, 2020, 18 adults participated in the interview study. The findings suggest that delusions are often embedded in wide-ranging alterations of basic reality experience, involving quasi-ineffable atmospheric and ontological qualities that undermine participants’ sense of the world as unambiguously real, fully present, and shared with others. We also found that delusional reality experience can differ from standard reality in various ways, across multiple dimensions, and that participants are often implicitly or explicitly aware of the distinction between delusional and standard reality. Delusional experience can have an enduring value and meaning that is not fully captured by a strictly medical perspective. INTERPRETATION: Increased awareness and recognition of the distinctive nature of delusional reality experience, in both clinical and research settings, can improve diagnostic accuracy, explanatory models, and therapeutic support for individuals with delusions whose lived realities are not always evident from an everyday perspective. FUNDING: FWO Flanders. TRANSLATION: For the Dutch translation of the abstract see Supplementary Materials section. (shrink)

Polygamy is a highly controversial topic and the object of serious political contestation in Indonesia. Although all major Muslim organizations consider polygamy is allowed under Islamic Law, the practice is not without stigma. In 1974 when Indonesia adopted its current Marriage Law, the Indonesian parliament decided to tie polygamy to strict conditions. This law however failed to prevent the practice of unregistered polygamous marriages. Women in unregistered polygamous marriages formally hold no rights as lawful wife in case of a divorce (...) or death of the husband. The question is what arrangements the second, third or fourth wife in unregistered polygamous marriages have made with their husband in view of the lack of legal recognition of their rights as wife. What are the consequences of non-recognition of their marriage for these women? Does legal insecurity in practice also mean economic and social insecurity? Does the husband fulfill his obligations and responsibilities towards his wives and their families? This article aims at answering those questions by looking in-depth at a selection of three case studies, which were collected during a total of nine months of research in Jakarta in 2015 and 2016. This article is part of the socio-legal domain, combining legal analysis with anthropological approaches. The starting point of the research is a legal one: the disadvantaged legal position of women whose polygamous marriage has not been registered, but a large part of the research is based on anthropological methods. Through the experiences of these women the paper will reveal a range of personal reasons and underlying causes for unregistered Islamic polygamous marriages as well as their consequences–including legal ones. The paper will depict a great diversity in legal reasoning, socio-economic considerations, religious reflections and daily life dilemmas of these individual women living in unregistered polygamous marriages. (shrink)

This volume consists of several contributions to a refined understanding of religious experience in view of contemporary theological epistemology.

Lists of species underpin many fields of human endeavour, but there are currently no universally accepted principles for deciding which biological species should be accepted when there are alternative taxonomic treatments (and, by extension, which scientific names should be applied to those species). As improvements in information technology make it easier to communicate, access, and aggregate biodiversity information, there is a need for a framework that helps taxonomists and the users of taxonomy decide which taxa and names should be used (...) by society whilst continuing to encourage taxonomic research that leads to new species discoveries, new knowledge of species relationships, and the refinement of existing species concepts. Here, we present 10 principles that can underpin such a governance framework, namely (i) the species list must be based on science and free from nontaxonomic considerations and interference, (ii) governance of the species list must aim for community support and use, (iii) all decisions about list composition must be transparent, (iv) the governance of validated lists of species is separate from the governance of the names of taxa, (v) governance of lists of accepted species must not constrain academic freedom, (vi) the set of criteria considered sufficient to recognise species boundaries may appropriately vary between different taxonomic groups but should be consistent when possible, (vii) a global list must balance conflicting needs for currency and stability by having archived versions, (viii) contributors need appropriate recognition, (ix) list content should be traceable, and (x) a global listing process needs both to encompass global diversity and to accommodate local knowledge of that diversity. We conclude by outlining issues that must be resolved if such a system of taxonomic list governance and a unified list of accepted scientific names generated are to be universally adopted. (shrink)

Conscientious objection and the limits of vertical toleration in the liberal state Liberal states tend to tolerate certain conscientious objectors, but not others. They tolerate doctors who conscientiously refuse to perform abortions, but do not extend the same toleration to civil servants who conscientiously refuse to register same-sex marriages. In this article, I analyse the attitude of liberal states to different claims of conscience in terms of vertical toleration, and its limits. Contrary to a prevailing political theoretical argument, I submit (...) that there is space for vertical toleration – that is, toleration by the state – in the contemporary liberal state. Yet, this space is limited. It only opens up when individuals’ practices prima facie contravene core liberal values. Whenever that is not the case, as with conscientious objection to military service, the lens of vertical toleration is not the appropriate one. But in relation to other claims of conscience, such as of doctors against abortion, the attitude of liberal states can be described in terms of vertical toleration. The practice finally reveals that certain conscientious objectors, particularly civil servants who refuse to register same-sex marriages, are not tolerated by the liberal state. Their practices exceed the limits of vertical toleration. This article explains why the prevailing practice in liberal states, as described, gets it right. (shrink)

Research increasingly demonstrates that associations between autonomy-relevant parenting and adolescent adjustment generalize across cultures. Yet, there is still an ongoing debate about the role of culture in these effects of autonomy-relevant parenting. The current study aimed to contribute to a more nuanced perspective on this debate by addressing cultural variability in micro-processes involved in autonomy-relevant parenting and, more specifically, in adolescents’ appraisals of and responses to parental behavior. In this vignette-based experimental study, involving 137 South-Korean adolescents (54% female, mean age (...) = 16 years), we examined whether individual differences in vertical collectivism affect the association between descriptions of potentially autonomy-supportive and controlling parenting practices and (a) appraisals of these practices (in terms of perceived autonomy support and control and experiences of autonomy need satisfaction and frustration), and (b) anticipated responses to these practices (i.e., negotiation, submissive compliance, and oppositional defiance). Participants in the autonomy-supportive condition reported more perceived autonomy support and autonomy satisfaction and lower perceived control and autonomy need frustration than participants in the controlling condition. Collectivism moderated between-vignette effects on perceived control and autonomy need frustration such that the differences between the autonomy-supportive and controlling vignettes were less pronounced (yet still significant) among adolescents scoring higher on collectivism. Collectivism did not moderate effects of the vignettes on the responses to parenting, but yielded a main effect, with collectivism relating to more submissive compliance and less oppositional defiance. Overall, the results suggest that both universal and culture-specific processes are involved in autonomy-relevant socialization. (shrink)

SUMMARYThis article explores how writers from the Dutch Golden Age thought about human contact with that which is elevated far above everyday life. The Dutch Republic offers an interesting context because of the strikingly early use there by seventeenth-century humanists of the Greek concept ὕψος, from Longinus, to discuss how writers, artists and their audiences were able to surpass human limitations thanks to an intense imagination which transported them to supreme heights. Dutch poets also used the Latin sublimis to discuss (...) how mankind constantly aims at that which is far above it, but, despite this, can never entirely be a part of it. Thirdly, protestant writers discuss the concept of the Fear of God by explaining that elevated contact with God should be accompanied by the contrasting emotions of attraction and fear. With reference to the humanist Franciscus Junius, poet Joost van den Vondel and preacher Petrus Wittewrongel, I will discuss how these artistic, literary and religious discourses concerning contact with the sublime are related to one another. (shrink)

In this volume we present the proceedings from the fourth international Leuven Encounters in Systematic Theology (LEST IV, November 5-8, 2003), which focussed ...

(3) a. Stijn-tje-se moeder kwam ons halen (Dutch child language: 6;7.14) Stijntje-se mother came us get (Stijntje is a girl’s name) Standard adult : Stijntjes moeder kwam ons halen b. Dit is wie-se? (Dutch child language: 6;3) This is whose? Standard adult: Van wie is dit? (4) a. vader-sen hond (dialect of Helmond) father-sen dog b. wie-se stoel (dialect of Helmond) who-se chair..

Dit jaarboek van het 'Studium Generale' van de Hogeschool Gent bevat essays van de sprekers die tijdens het academiejaar 2012-2013 een lezing hebben gehouden over het jaarthema ‘Normaal!? Waar is de norm?’. In deze bundel wordt stilgestaan bij de vraag hoe de tweedeling normaal/abnormaal aan de orde is in de maatschappij, in de kunsten en in de (medische) wetenschappen.0Deze lezingenreeks werd samengesteld door Sofie Vandamme en georganiseerd i.s.m. Jeroen Cluckers. Het boek bevat bijdragen van Sofie Vandamme, Charlotte Mutsaers, Peter Hinssen, (...) Dirk De Wachter, Maartje Schermer, Piet Hoebeke, Kristien Hemmerechts, Patrick Allegaert en Bart Marius, Stijn Vanheule, Paul De Grauwe, Hilde Van den Bulck, Jens Franssen en Dieter Ceustermans. Ook de beste paper van de deelnemende studenten werd mee opgenomen. (shrink)

"This is an important book, and no one interested in issues which touch on the free will will want to ignore it."--Ethics. In this stimulating and thought-provoking book, the author defends the thesis that free will is incompatible with determinism. He disputes the view that determinism is necessary for moral responsbility. Finding no good reason for accepting determinism, but believing moral responsiblity to be indubitable, he concludes that determinism should be rejected.

A large share of the available literature on television and ageing depicts old age as a life stage characterized by losses in which people use television as a substitute for decreased activities. The aim of the present study is to investigate how television viewing is part of both selection and compensation strategies. Based on a qualitative interview study among a diverse sample of older adults, we found three ways in which television viewing is part of selection strategies and three ways (...) in which it is part of compensation strategies. In contrast to the focus on compensation in previous research, we found that selection strategies appear to provide a better characterization of older people’s television viewing than compensation strategies. Moreover, particular television viewing behavior does not automatically signal whether television viewing is part of selection or compensation strategies. (shrink)

The aim of this study was to construct a closed-end measure of moral reasoning on interpersonal violence and to explore the relationship between television exposure and children's use of moral reasoning strategies. Participants were 377 elementary school children in fourth to sixth grade who completed questionnaires containing measures on moral reasoning and violent and non-violent television viewing. The reliability and validity of the CEMRIV as a scale of moral reasoning are discussed. Regression analyses indicated that exposure to violent television content (...) was positively related to a preference for authority-based reasoning on interpersonal violence. Violent television exposure was also a significant predictor of the preference for approval-oriented reasoning about prosocial dilemmas. Furthermore, non-violent television viewing was positively associated with a preference for perspective-based moral reasoning. These findings provide support for a mental model approach. (shrink)