The Danaid Theory of Aging

The classical evolutionary theories of aging suggest that aging evolves due to insufficient selective pressure against it. In these theories, declining selection pressure with age leads to aging through genes or resource allocations, implying that aging could potentially be stalled were genes, resource allocation, or selection pressure somewhat different. While these classical evolutionary theories are undeniably part of a description of the evolution of aging, they do not explain the diversity of aging patterns, and they do not constitute the only possible evolutionary explanation. Without denying selection pressure a role in the evolution of aging, we argue that the origin and diversity of aging should also be sought in the nature and evolution of organisms that are, from their very physiological make up, unmaintainable. Drawing on advances in developmental biology, genetics, biochemistry, and complex systems theory since the classical theories emerged, we propose a fresh evolutionary-mechanistic theory of aging, the Danaid theory. We argue that, in complex forms of life like humans, various restrictions on maintenance and repair may be inherent, and we show how such restrictions are laid out during development. We further argue that there is systematic variation in these constraints across taxa, and that this is a crucial factor determining variation in aging and lifespan across the tree of life. Accordingly, the core challenge for the field going forward is to map and understand the mosaic of constraints, trade-offs, chance events, and selective pressures that shape aging in diverse ways across diverse taxa.

Etiologie a evoluční teorie mužské homosexuality

Regarding the fact that gay men leave less offspring than straight men, it is appropriate to raise a question by which means is male homosexuality maintained in a population and what could eventually be its evolutionary role. The aim of this paper is to summarize theories that try to explain male homosexuality within the framework of evolution. Furthermore, it aims to critically evaluate the results of empirical research that support particular theories or give evidence against them. In the first part, the paper provides a review of knowledge about the genetic and immunological origins of male homosexuality which consequently serves as a theoretical base for the main part of the paper that pursues the five most influential evolutionary theories of male homosexuality.

Ethnomedical specialists and their supernatural theories of disease

Religious healing specialists such as shamans often use magic. Evolutionary theories that seek to explain why laypersons find these specialists convincing focus on the origins of magical cognition and belief in the supernatural. In two studies, we reframe the problem by investigating relationships among ethnomedical specialists, who possess extensive theories of disease that can often appear “supernatural,” and religious healing specialists. In study 1, we coded and analyzed cross-cultural descriptions of ethnomedical specialists in 47 cultures, finding 24% were also religious leaders and 74% used supernatural theories of disease. We identified correlates of the use of supernatural concepts among ethnomedical specialists; incentives and disincentives to patronize ethnomedical specialists; and distinct clusters of ethnomedical specialists that we label prestigious teachers, feared diviners, and efficacious healers. In study 2, we interviewed 84 Maasai pastoralists and their traditional religious and non-religious healing specialists. We found that laypersons relied on medicinal services based on combinations of efficacy, religious identity, and interpersonal trust. Further, laypersons and specialists largely used abstract concepts that were not conspicuously supernatural to describe how local medicines work. We conclude that religious healers in traditional societies often fulfill a practical and specialized service to local clients, and argue that supernatural theories of disease often reflect abstract cognition about rare phenomena whose causes are unobservable (e.g., infection, mental illness) instead of a separate “religious” style of thinking.

Differential Effects of Resource Scarcity and Pathogen Prevalence on Heterosexual Women's Facial Masculinity Preferences

The present research focused on how environmental harshness may affect heterosexual women's preferences of potential male mates’ facial characteristics, namely masculinity-femininity. The evidence on this issue is mixed and mostly from Western samples. We aimed to provide causal evidence using a sample of Turkish women and Turkish male faces. A video-based manipulation was developed to heighten environmental harshness perceptions. In the main experiment, participants were primed with either resource scarcity, pathogen prevalence, or neither (control). They then saw masculinized versus feminized versions of the same faces and indicated the face they would prefer for a long-term relationship and separately rated the faces on various dimensions. In general, masculinized faces were perceived as slightly more attractive, slightly healthier, and much more formidable. A multilevel Bayesian model showed that pathogen prevalence lowered the preference for masculinized faces while resource scarcity weakly elevated it. The overall drop of attractiveness ratings in cases of high perceived pathogen prevalence, one of the strongest effects we observed, suggests that during epidemics, formation of new relationships is not a favourable strategy. Implications for evolutionary theories of mate preference are discussed.

How Biological Concepts and Evolutionary Theories Are Inspiring Advances in Machine Intelligence

Since its advent in the mid-twentieth century, the field of artificial intelligence (AI) has been heavily influenced by biology. From the structure of the brain to evolution by natural selection, core biological concepts underpin many of the fundamental breakthroughs in modern AI. Here, focusing specifically on artificial neural networks (ANNs) that have become commonplace in machine learning, we show the numerous connections between theories based on coevolution, multi-level selection, modularity and competition and related developments in ANNs. Our aim is to illuminate the valuable but often overlooked inspiration biologists have provided AI research and to spark future contributions at this intersection of biology and computer science. Although recent advances in AI have been swift, many significant challenges remain requiring innovative solutions. Thankfully, biology in all its forms still has a lot to teach us, especially when trying to create truly intelligent machines.

Aunts and Uncles

This chapter studies the behavior of one specific group of extended family members, namely aunts and uncles. Aunts and uncles typically belong to the same generation as the children’s parents, but obviously the relations between aunts and uncles and their nieces and nephews are very different compared to parent–child relations. This is due to the fact that aunts and uncles are seldom the main caregivers of their nieces and nephews, and in contemporary Western societies, they rarely live in the same household as them. That said, however, noncoresiding aunts and uncles can serve as important alloparents for children and are often highly committed to the lives of their nieces and nephews, providing, for instance, social support, friendship, mentoring, and role models. The chapter then outlines key evolutionary theories of intergenerational family relations explaining the behavior of aunts and uncles. It also considers the investment of aunts and uncles in contemporary affluent societies.

The late ascent of Darwin's Descent: exploring human evolution and women's role for a new China, 1927–1965

Darwin's ideas held sway among Chinese intellectuals by the early twentieth century. Yet the usual emphasis was a Spencerism instead of Darwin's original ideas. As a result, translations of The Descent of Man in the early twentieth century quickly fell into oblivion. When the embryologist Zhu Xi (1900–62) eventually decided to give all evolutionary theories a comprehensive examination, he nevertheless found the idea of sexual evolution inadequate, as expressed in his volume Biological Evolution (1958). Only in the 1950s did serious efforts to translate Descent gather momentum, thanks to eugenicist and sociologist Pan Guangdan (1899–1967). Such efforts were not only responses to a renewed interest in Darwinism under the socialist regime, but also expressions that synthesized both scholars’ earlier paths in wrestling with schemes of human evolution and the roles of women in China's survival and renewal. Trained in different scientific and cultural milieus and holding almost oppositional views, the two scholars nevertheless converged in finding new meanings in Darwin's Descent.

Opposing Association of Situational and Chronic Loneliness with Interpersonal Distance

Loneliness is a prevalent condition with adverse effects on physical and mental health. Evolutionary theories suggest it evolved to drive people to reconnect. However, chronic loneliness may result in a negative social bias and self-preservation behaviors, paradoxically driving individuals away from social interactions. Lonely people often feel they are not close to anyone; however, little is known about their interpersonal distance preferences. During COVID-19, many experienced situational loneliness related to actual social isolation. Therefore, there was a unique opportunity to examine both chronic and situational (COVID-19-related) loneliness. In the present study, 479 participants completed an online task that experimentally assessed interpersonal distance preferences in four conditions—passively being approached by a friend or a stranger, and actively approaching a friend or a stranger. Results show that high chronic loneliness was related to a greater preferred distance across conditions. Intriguingly, by contrast, high COVID-19-related loneliness was related to a smaller preferred distance across conditions. These findings provide further support for the evolutionary theory of loneliness: situational loneliness indeed seems to drive people towards reconnection, while chronic loneliness seems to drive people away from it. Implications for the amelioration of chronic loneliness are discussed based on these findings.

The Carbon-Based Evolutionary Theory (CBET)

Evolution is fundamental to natural sciences and social sciences. Existing evolutionary theories are incomplete and unable to explain multiple evolutionary issues. To establish a comprehensive and comprehensible evolutionary theory, we employ the concept carbon-based entities (CBEs), which include methane, glucose, proteins, organisms, and other entities chemically containing carbon atoms. We deduce the steps, driving forces, and mechanisms of evolution of CBEs, through integration of geology, physics (particularly the second law of thermodynamics), chemistry (particularly chemical reactions of CBEs), and biology (particularly the essence of reproduction, genomes, and natural selection). We hence establish the Carbon-Based Evolutionary Theory (CBET), which suggests that evolution is the increase in the amount, diversity, and fitness of higher-hierarchy CBEs under natural selection and driven by the organic synthesis tendency on the Earth from the thermodynamic features of the Earth. It provides better explanations for various evolutionary issues (e.g. life origin, neutral mutation, speciation, and evolutionary tempos) than existing evolutionary theories. It reveals the physiochemical roots of biological evolution and the evolutionary roots of multiple social notions important to harmonious development of human society. It refutes from a novel respect some incorrect thermodynamic notions regarding evolution (e.g. negative entropy). It hence removes contradictions between physiochemistry, biology, and social sciences, and bridges them through evolution. The CBET is reliable as per its deduction and applications. Therefore, the CBET is more scientific and comprehensive than existing evolutionary theories, and could have great significance in natural sciences and social sciences. Meanwhile, the CBET is open to optimization and extension.

The rhetorical use of B. F. Skinner in evolutionary psychology

This article examines Skinner’s often neglected ideas about evolution, which he returns to in his final academic paper. I attempt to square Skinner’s advocacy for evolutionary explanation, including his efforts to reconcile biological, individual, and cultural adaptation, with how he is framed and critiqued by a school of evolutionary psychologists who attribute to Skinner a blank slate, or so-called standard social science model, view of the mind. I argue that characterizing Skinner in this manner is inconsistent with his evolutionary writings and ignores Skinner’s explicit disavowals of such interpretations. I then discuss Skinner’s evolutionary views in light of contemporary evolutionary theories of human psychology. I also compare the reception to evolutionary psychology and Skinner within the field more generally and conclude by discussing the proposal that evolutionary psychology should be considered a new paradigm for psychology, a claim that seems to follow from evolutionary psychologists’ caricature of Skinner.