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Die meisten Menschen haben schon sich selbst, ihren Freunden oder ihrem Therapeuten die Frage gestellt, ob sie gehen oder bleiben sollen, ob ihre Ehe oder ihre Beziehung noch zu retten ist. Der Autor beleuchtet diese heiklen Momente und weckt neues Verständnis für Vertrauen und Partnerschaft.

We social animals must balance the need to avoid infections with the need to interact with conspecifics. To that end we have evolved, alongside our physiological immune system, a suite of behaviors devised to deal with potentially contagious individuals. Focusing mostly on humans, the current review describes the design and biological innards of this behavioral immune system, laying out how infection threat shapes sociality and sociality shapes infection threat. The paper shows how the danger of contagion is detected and posted to the brain; how it affects individuals' mate choice and sex life; why it strengthens ties within groups but severs those between them, leading to hostility toward anyone who looks, smells, or behaves unusually; and how it permeates the foundation of our moral and political views. This system was already in place when agriculture and animal domestication set off a massive increase in our population density, personal connections, and interaction with other species, amplifying enormously the spread of disease. Alas, pandemics such as COVID-19 not only are a disaster for public health, but, by rousing millions of behavioral immune systems, could prove a threat to harmonious cohabitation too.

Natural selection has favored the evolution of behaviors that benefit not only one's genes, but also their copies in genetically related individuals. These behaviors include optimal outbreeding (choosing a mate that is neither too closely related, nor too distant), nepotism (helping kin), and spite (hurting non-kin at a personal cost), and all require some form of kin detection or kin recognition. Yet, kinship cannot be assessed directly; human kin detection relies on heuristic cues that take into account individuals' context (whether they were reared by our mother, or grew up in our home, or were given birth by our spouse), appearance (whether they smell or look like us), and ability to arouse certain feelings (whether we feel emotionally close to them). The uncertainties of kin detection, along with its dependence on social information, create ample opportunities for the evolution of deception and self-deception. For example, babies carry no unequivocal stamp of their biological father, but across cultures they are passionately claimed to resemble their mother's spouse; to the same effect, 'neutral' observers are greatly influenced by belief in relatedness when judging resemblance between strangers. Still, paternity uncertainty profoundly shapes human relationships, reducing not only the investment contributed by paternal versus maternal kin, but also prosocial behavior between individuals who are related through one or more males rather than females alone. Because of its relevance to racial discrimination and political preferences, the evolutionary pressure to prefer kin to non-kin has a manifold influence on society at large.

AbstractPeople usually update their beliefs selectively in response to good news and disregard bad news. Here, we investigated in two preregistered experiments (N = 278 and N = 306) (1) whether such valence‐dependent belief updating also underlies information processing in the context of climate change and (2) whether it can be altered by interventions informing about different aspects of climate change. To this end, we adapted a well‐established belief update task to the context of climate change. In multiple trials, participants were asked about their beliefs about adverse consequences of climate change; subsequently, they were asked to update their beliefs in light of new information. Both studies provided evidence against the hypothesis that people integrate good news about climate change more than bad news. After half of the trials, participants were randomized to one of four video‐based interventions, each of which aimed at promoting a more accurate risk perception and increasing pro‐environmental intentions. After the interventions, participants showed a more accurate risk perception, and women rather than men increased their intentions for pro‐environmental behavior. The results provide implications for climate change communication, as they show that when facing the consequences of climate change, people adjust their risk perception accurately and increase their pro‐environmental intentions.