The principles of sexual selection were used as an organizing framework for interpreting cross-national patterns of sex differences in mathematical abilities. Cross-national studies suggest that there are no sex differences in biologically primary mathematical abilities, that is, for those mathematical abilities that are found in all cultures as well as in nonhuman primates, and show moderate heritability estimates. Sex differences in several biologically secondary mathematical domains are found throughout the industrialized world. In particular, males consistently outperform females in the solving (...) of mathematical word problems and geometry. Sexual selection and any associated proximate mechanisms influence these sex differences in mathematical performance indirectly. First, sexual selection resulted in greater elaboration in males than in females of the neurocognitive systems that support navigation in three-dimensional space. Knowledge implicit in these systems reflects an understanding of basic Euclidean geometry, and may thus be one source of the male advantage in geometry. Males also use more readily than females these spatial systems in problem-solving situations, which provides them with an advantage in solving word problems and geometry. In addition, sex differences in social styles and interests, which also appear to be related in part to sexual selection, result in sex differences in engagement iii mathematics-related activities, thus further increasing the male advantage in certain mathematical domains. A model that integrates these biological influences with sociocultural influences on the sex differences in mathematical performance is presented in this article. (shrink)

Mower questions some aspects of Geary's proposals regarding the nature of male-male and female-female relationships during human evolution and the implications for understanding the basis for same-sex friendships. The core of this proposal is reviewed and Mower's challenges to the core are addressed.

The relation between sex hormones and responses to partner infidelity was explored in two studies reported here. The first confirmed the standard sex difference in relationship jealousy, that males (n=133) are relatively more distressed by a partner’s sexual infidelity and females (n=159) by a partner’s emotional infidelity. The study also revealed that females using hormone-based birth control (n=61) tended more toward sexual jealousy than did other females, and reported more intense affective responses to partner infidelity (n=77). In study two, 47 (...) females were assessed four times across one month. Patterns of response to partner infidelity did not vary by week of menstrual cycle, but significant relations between salivary estradiol level and jealousy responses were obtained during the time of rising and high fertility risk. The implications, at least for females, are that any evolved psychological, affective, or behavioral dispositions regarding reproduction-related relationships are potentially moderated by estradiol, and that the use of synthetic hormones may disrupt this relation. (shrink)

The male advantage in certain mathematical domains contributes to the difference in the numbers of males and females that enter math-intensive occupations, which in turn contributes to the sex difference in earnings. Understanding the nature and development of the sex difference in mathematical abilities is accordingly of social as well as scientific concern. A more complete understanding of the biological contributions to these differences can guide research on educational techniques that might someday produce more equal educational outcomes in mathematics and (...) other academic domains. (shrink)

Sexual selection traditionally involves male-male competition and female choice, but in some species, including humans, sexual selection can also involve female-female competition and male choice. The degree to which one aspect of sexual selection or another is manifest in human populations will be influenced by a host of social and ecological variables, including the operational sex ratio. These variables are discussed in connection with the relative contribution of sexual selection and the division of labor to the evolution of human sex (...) differences. (shrink)

A sample of 460 low-income women completed a mate preference questionnaire and surveys that assessed family background, life history, conscientiousness, sexual motives, self-ratings (e.g., looks), and current circumstances (e.g., income). A cluster analysis revealed two groups of women: women who reported a strong preference for looks and money in a short-term mate and commitment in a long-term mate, and women who reported smaller differences across mating context. Group differences were found in reported educational levels, family background, sexual development, number of (...) children, and motives for having sex. Implications for understanding individual differences in women’s mate-preference trade-offs are discussed. (shrink)

Hypotheses regarding the selective pressures driving the threefold increase in the size of the hominid brain since Homo habilis include climatic conditions, ecological demands, and social competition. We provide a multivariate analysis that enables the simultaneous assessment of variables representing each of these potential selective forces. Data were collated for latitude, prevalence of harmful parasites, mean annual temperature, and variation in annual temperature for the location of 175 hominid crania dating from 1.9 million to 10 thousand years ago. We also (...) included a proxy for population density and two indexes of paleoclimatic variability for the time at which each cranium was discovered. Results revealed independent contributions of population density, variation in paleoclimate, and temperature variation to the prediction of change in hominid cranial capacity (CC). Although the effects of paleoclimatic variability and temperature variation provide support for climatic hypotheses, the proxy for population density predicted more unique variance in CC than all other variables. The pattern suggests multiple pressures drove hominid brain evolution and that the core selective force was social competition. (shrink)

We agree with Archer that human sex differences in aggression are well explained by sexual selection, but note that explanations of human behaviors are not logically mutually exclusive from explanations and therefore should not be framed as such. We discuss why this type of framing hinders the development of both social learning and evolutionary theories of human behavior.

Spatial and mathematical abilities may be “sex-limited” traits. A sex-limited trait has the same determinants of variation within the sexes, but the genetic or environmental effects would be differentially expressed in males and females. New advances in structural equation modeling allow means and variation to be estimated simultaneously. When these statistical methods are combined with a genetically informative research design, it should be possible to demonstrate that the genes influencing spatial and mathematical abilities are sex-limited in their expression. This approach (...) would give an empirical confirmation of Geary's evolutionary speculations. (shrink)

By means of an example, shows the possibility of beliefs that are separately rational whilst together inconsistent.

This chapter contains sections titled: The Nature of Beauty Truth, Goodness, and Beauty Beauty and the Blues Notes.

This is the first book-length study of the development of civility in Chinese societies. Although some social scientists and political philosophers have discussed civility, none has defined it as an analytical tool to systematically measure attitudes and behavior, and few have applied it to a non-Western society. By comparing the development of civility in mainland China and Taiwan, Civility and Its Development: The Experiences of China and Taiwan analyzes the social conditions needed for civility to become established in a society. (...) Schak argues that the attempts to impose civility top-down from the state are ineffective. Civility appeared in Taiwan only after state efforts to impose it ceased at the end of the 1980s when Taiwan began to democratize, and the PRC government civility campaigns have so far had only limited success. The book concludes with an examination of various differences between Taiwan and the PRC relevant to Taiwan’s having become a society with civility while the PRC still encounters difficulties in doing so. The essential factor in developing civility in Taiwan, Schak contends, was its evolution from a place composed of myriad small, inward-looking communities to a society in which everyone shares a strong identity and civic consciousness, and people consider others as fellow members, not anonymous strangers. “This book represents the most thorough review of what social scientists once called ‘the civilizing process’ in Chinese society. David C. Schak builds on the earlier studies on this issue and goes well beyond the established literature.” —James Watson, Fairbank Professor of Chinese Society and Professor of Anthropology, Emeritus, Harvard University “This is a topic that people talk about all the time, and David C. Schak draws a lot of material together in a systematic and comprehensive way that can stimulate important discussions beyond the academy.” —Thomas Gold, Professor of Sociology, University of California, Berkeley. (shrink)

Many worry that global warming may produce dire consequences not just for humankind, but for many other living organisms on the planetEarth. This has raised concerns about the desirability of the political and economic policies that brought us to this point in history, a period of markedly higher levels of consumptionConsumption that produce higher levels of CO2. That, in turn, has raised new concerns about the ideologies and theoretical paradigms upon which such political and economic policies are based. Many now (...) call for a rejection of free marketFree Market economies to make room for more centrally planned economic systems. Even the idea of Homo EconomicusHomo Economicus – the primary actor in the modern free marketFree Market economy – is under fire in favor of a new conceptualization of the primary actor: Homo CuratorHomo Curator. This essay explains why these changes are both unnecessary and dangerous. I argue they are unnecessary by showing: (1) Homo Economicus and excessive consumptionConsumption are not the root of the problem, and (2) how the theory of market failure already gives us proven means to address problems like global warming. I argue that abandoning Homo Economicus and the free marketFree Market economy is dangerous because it will inevitably lead to a world that is far less likely to support individual and collective human flourishing; one that poorer, less free, and less respectful of the sanctity of the individual. (shrink)

The organism is one of the fundamental concepts of biology and has been at the center of many discussions about biological individuality, yet what exactly it is can be confusing. The definition that we find generally useful is that an organism is a unit in which all the subunits have evolved to be highly cooperative, with very little conflict. We focus on how often organisms evolve from two or more formerly independent organisms. Two canonical transitions of this type—replicators clustered in (...) cells and endosymbiotic organelles within host cells—demonstrate the reality of this kind of evolutionary transition and suggest conditions that can favor it. These conditions include co-transmission of the partners across generations and rules that strongly regulate and limit conflict, such as a fair meiosis. Recently, much attention has been given to associations of animals with microbes involved in their nutrition. These range from tight endosymbiotic associations like those between aphids and Buchnera bacteria, to the complex communities in animal intestines. Here, starting with a reflection about identity through time, we consider the distinctions between these kinds of animal–bacteria interactions and describe the criteria by which a few can be considered jointly organismal but most cannot. (shrink)

We explore ways in which purely qualitative belief change in the AGM tradition throws light on options in the treatment of conditional probability. First, by helping see why it can be useful to go beyond the ratio rule defining conditional from one-place probability. Second, by clarifying what is at stake in different ways of doing that. Third, by suggesting novel forms of conditional probability corresponding to familiar variants of qualitative belief change, and conversely. Likewise, we explain how recent work on (...) the qualitative part of probabilistic inference leads to a very broad class of 'proto-probability' functions. (shrink)

While environmental claims are increasingly used by companies to appeal consumers, they also attract greater scrutiny from independent parties interested in consumer protection. Consumers are now able to compare corporate environmental claims against external, often disconfirming, information to form their brand attitudes and purchase intentions. What remains unclear is how the level of information specificity of both the environmental claims and external disconfirming information interact to influence consumer reactions. Two experiments address this gap in the CSR communication literature. When specific (...) claims are countered by specific external information, consumers report more negative brand attitudes and lower purchase intentions. The effect is serially mediated by skepticism toward the claims and lack of corporate credibility. We conclude by discussing strategies that firms can utilize to avoid information dilution and ensure that external disconfirming information percolates to consumers as specific. (shrink)

I argue that thought experiments are a form of experimental reasoning similar to real experiments. They require the same ability to participate by following a narrative as real experiments do. Participation depends in turn on using what we already know to visualize, manipulate and understand what is unfamiliar or problematic. I defend the claim that visualization requires embodiment by an example which shows how tacit understanding of the properties of represented objects and relations enables us to work out how such (...) objects might behave in a postulated world. This knowledge is that of embodied agents. That thought experiments require embodied participation is what makes them experiments rather than arguments. Unlike real experiments, from which ordinary perception has been displaced by instrumentation, thought experiments still appeal to relatively unmediated common sense, even when their purpose is to criticize or subvert common sense notions. (shrink)

William James is frequently considered one of America's most important philosophers, as well as a foundational thinker for the study of religion. Despite his reputation as the founder of pragmatism, he is rarely considered a serious philosopher or religious thinker. In this new interpretation David Lamberth argues that James's major contribution was to develop a systematic metaphysics of experience integrally related to his developing pluralistic and social religious ideas. Lamberth systematically interprets James's radically empiricist world-view and argues for an (...) early dating for his commitment to the metaphysics of radical empiricism. He offers a close reading of Varieties of Religious Experience; and concludes by connecting James's ideas about experience, pluralism and truth to current debates in philosophy, the philosophy of religion, and theology, suggesting James's functional, experiential metaphysics as a conceptual aid in bridging the social and interpretive with the immediate and concrete while avoiding naive realism. (shrink)

In philosophy of aesthetics, scholars commonly express a commitment to the premise that there is a distinctive type of judgment that can be meaningfully labeled “aesthetic”, and that these judgments are distinctively different from other types of judgments. We argue that, within an Aristotelian framework, there is no clear avenue for meaningfully differentiating “aesthetic” judgment from other types of judgment, and, as such, we aim to question the assumption that aesthetic judgment does in fact constitute a distinctive kind of judgment (...) that is in need of, or can be subject to, distinctive theorizing. We advance our argument primarily through demonstrating that leading contemporary accounts of aesthetic judgment do not successfully distinguish a type of judgment in that they do not tell us how making an aesthetic judgment differs substantially from judging that 2 + 3 = 5, that football is entertaining, or that today is Tuesday. (shrink)