Do sincere apologies need to be costly? Test of a costly signaling model of apology

The present study examined a costly signaling model of human apology. The model assumes that an unintentional transgressor is more motivated to restore the relationship with the victim than an intentional transgressor who depreciates the relationship. The model predicts the existence of a separating equilibrium, in which only sincere apologizers will pay a certain cost to restore the relationship, while dishonest apologizers will not. Accordingly, we hypothesized that the receivers of an apology would be sensitive to the cost involved in the apology. 2 Experiment 1, 3 Experiment 2 were vignette experiments, in which participants imagined that they were victims of an interpersonal transgression and received either a costly or no-cost apology. The costliness of the apology was manipulated by the presence of an apology gift in Experiment 1, and by inconvenience voluntarily experienced by the transgressor to make an apology in Experiment 2. In both experiments, participants found the costly apologizer to be more sincere than the no-cost apologizer. Experiment 3 employed a modified dictator game, in which a fictitious partner behaved in an unfair manner and apologized to the participants. The apology cost was manipulated as a fee for sending the apology message. The results of 2 Experiment 1, 3 Experiment 2 were replicated. In addition, when given a chance to send a complaint message to the unfair person, participants in the costly apology condition abstained from doing so. Implications of the study are discussed in relation to applications of the costly signaling theory to interpersonal behavior.     

The benefits of costly signaling: Meriam turtle hunters

Hunting, particularly when it involves large game that is extensivelyshared, has been suggested to serve as a form of costly signalingby hunters, serving to attract mates and allies or to detercompetitors. Empirical evidence presented elsewhere on turtlehunting practiced by Meriam people of Torres Strait, Australia,supports several key predictions of the costly signaling account.Here we present evidence from the same study bearing on anotherkey prediction, that signalers (hunters) gain social and reproductivebenefits. Specifically, we find that successful hunters gainsocial recognition, have an earlier onset of reproduction, achievehigher age-specific reproductive success, and gain higher qualitymates, who also achieve above-average reproductive success.Meriam hunters also average more mates (women who bear theiroffspring) and more co-resident sexual partners than other men,and these partners (but not mates) are significantly younger.Several lines of evidence thus support the idea that huntingis a form of costly signaling in this population. Alternativehypotheses involving reciprocity (from grateful recipients ofmeat) and direct offspring provisioning by hunters are not consistentwith available evidence, but in the absence of experimentalmanipulation we cannot rule out a role for phenotypic correlation.     

Social inequality and signaling in a costly ritual

Evolutionary perspectives suggest that participation in collective rituals may serve important communicative functions by signaling practitioners' commitment to the community and its values. While previous research has examined the effects of ritual signals at the individual and collective level, there has been limited attention directed to the impact of socio-environmental factors on the quality of ritual signaling. We examined this impact in the context of the Thaipusam Kavadi, a collective ritual performed by Tamil Hindus worldwide that involves body piercings and other costly activities. We show that participants' relative position in the social hierarchy systematically affects the form of ritual signaling. Specifically, we found that low-status participants are more likely to engage in signaling modalities that require somatic and opportunity costs in the form of body piercings and cumulative effort, while high-status individuals are more likely to use financial capital, in the form of more elaborate material offerings to the deity. Moreover, signaling in each particular modality is stronger among individuals who participate in more public (but not private) rituals, corresponding to their long-term commitment to the community. In sum, our results demonstrate that social hierarchies exact unequal requirements on ritual participants, who in turn modify their signaling strategies accordingly.     

Biosurfactants: moving towards industrial application.

Chemically synthesized surface-active compounds are widely used in the pharmaceutical, cosmetic, petroleum and food industries. However, with the advantages of biodegradability, and production on renewable-resource substrates, biosurfactants may eventually replace their chemically synthesized counterparts. So far, the use of biosurfactants has been limited to a few specialized applications because biosurfactants have been economically uncompetitive. There is a need to gain a greater understanding of the physiology, genetics and biochemistry of biosurfactant-producing strains, and to improve process technology to reduce production costs.     

The urgent need for microbiology literacy in society: children as educators

Microbes and their activities have pervasive influence and deterministic roles in the functioning and health of the geosphere, atmosphere and biosphere, i.e. in nature. Microbiology can be considered a language of nature. We have argued that the relevance of microbes for everyday personal decisions and collective policies requires that society attains microbiology literacy, through the introduction of child-relevant microbiology topics into school curricula. That is: children should learn the microbiology language of nature. Children can be effective transmitters of new and/or rapidly evolving knowledge within families and beyond, where there is a substantive information asymmetry (witness digital technology, social media, and new languages in foreign countries). They can thus be key disseminators of microbiology knowledge, where there will be information asymmetry for the foreseeable future, and thereby contribute to the attainment of microbiology literacy in society. The education of family and friends can be encouraged/stimulated by home assignments, family leisure projects, and school-organised microbiology-centric social-education events. Children are key stakeholders in family decisions. Their microbiology knowledge, and their dissemination of it, can help inform and increase the objectivity of such decisions.     

Altruism in viscous populations — an inclusive fitness model

Summary A viscous population (Hamilton, 1964) is one in which the movement of organisms from their place of birth is relatively slow. This viscosity has two important effects: one is that local interactions tend to be among relatives, and the other is that competition for resources tends to be among relatives. The first effect tends to promote and the second to oppose the evolution of altruistic behaviour. In a simulation model of Wilsonet al. (1992) these two factors appear to exactly balance one another, thus opposing the evolution of local altruistic behaviour. Here I show, with an inclusive fitness model, that the same result holds in a patchstructured population.     

COVID-19 and purinergic signaling: the need for investigation

Purinergic Signalling -     

Sexual display and mate choice in an energetically costly environment

Sexual displays and mate choice often take place under the same set of environmental conditions and, as a consequence, may be exposed to the same set of environmental constraints. Surprisingly, however, very few studies consider the effects of environmental costs on sexual displays and mate choice simultaneously. We conducted an experiment, manipulating water flow in large flume tanks, to examine how an energetically costly environment might affect the sexual display and mate choice behavior of male and female guppies, Poecilia reticulata. We found that male guppies performed fewer sexual displays and became less choosy, with respect to female size, in the presence of a water current compared to those tested in still water. In contrast to males, female responsive to male displays did not differ between the water current treatments and females exhibited no mate preferences with respect to male size or coloration in either treatment. The results of our study underscore the importance of considering the simultaneous effects of environmental costs on the sexual behaviors of both sexes.     

Alternative insecticides: an urgent need

Most insecticides used against pests and vectors of human disease (e.g. fleas, flies and mosquitoes) are spin-offs from agrochemical research and development. The arsenal of safe and cost-effective public health insecticides is being depleted by restrictions for various reasons (e.g. insecticide resistance, unacceptable side effects and non re-registration) and the number of new products launched is dwindling. Mobilizing public resources and establishment of partnerships to support research and development of public health insecticides is crucial in the post-DDT and post-pyrethroid era.     

Children in an ageing society

This paper explores the implications of demographic aging for children and pediatric practice in the Western society. It focuses on the social class differences in childbearing patterns, specific issues related to disability, and distribution of resources between age groups. Women in the Western world are now having children at an older age than at any time in the past 50 years. Voluntary childlessness or deliberate delay in childbearing is common among highly educated women. This changing pattern in childbearing may increase and polarize health and wealth inequalities. With advancements in neonatal and pediatric care which prolong life expectancy and survival of disabled children, it is projected that there will be an increasing number of very old parents caring for severely disabled offspring. Meanwhile, there are also many children who are carrying considerable burdens of caring for their disabled parents. The community burden of disability will continue to rise. The needs of the elderly population may drain resources from child health services. Despite this demographic pattern, care for the children is still important. Health care authorities must not become contented with the existing pediatric care services just because demographic changes require that the nation should invest more in care of the older population.     

Altruism in networks: the effect of connections

Why are individuals altruistic to their friends? Theory suggests that individual, relationship and network factors will all influence the levels of altruism; but to date, the effects of social network structure have received relatively little attention. The present study uses a novel correlational design to test the prediction that an individual will be more altruistic to friends who are well-connected to the individual''s other friends. The result shows that, as predicted, even when controlling for a range of individual and relationship factors, the network factor (number of connections) makes a significant contribution to altruism, thus showing that individuals are more likely to be altruistic to better-connected members of their social networks. The implications of incorporating network structure into studies of altruism are discussed.