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71.
72.
This article provides a review of evolutionary theory and empirical research on mate choices in nonhuman species and uses it as a frame for understanding the how and why of human mate choices. The basic principle is that the preferred mate choices and attendant social cognitions and behaviors of both women and men, and those of other species, have evolved to focus on and exploit the reproductive potential and reproductive investment of members of the opposite sex. Reproductive potential is defined as the genetic, material, and/or social resources an individual can invest in offspring, and reproductive investment is the actual use of these resources to enhance the physical and social well- being of offspring. Similarities and differences in the mate preferences and choices of women and men are reviewed and can be understood in terms of similarities and differences in the form of reproductive potential that women and men have to offer and their tendency to use this potential for the well-being of children. 相似文献
73.
Bullivant SB Sellergren SA Stern K Spencer NA Jacob S Mennella JA McClintock MK 《Journal of sex research》2004,41(1):82-93
Imprecise measures of ovulation obscure the relationship between women's sexuality and the menstrual cycle, as does studying women with different contraceptive goals in different social contexts. Here we present a novel noninvasive method to precisely pinpoint the preovulatory surge of Luteinizing Hormone (LH), demarcating hormonally distinct cycle phases with greater than 95% reliability. Women were more sexually active on days prior to and including the preovulatory (LH) surge. This pattern was evident only when women initiated sexual activity and not when their partners did, indicating an increase in women's sexual motivation rather than attractiveness. A second study replicated the 6-day increase in sexual activity beginning 3 days before the LH surge, accompanied by stronger sexual desire and more sexual fantasies. We propose the term 'sexual phase' of the cycle, since follicular phase is over inclusive and ovulatory phase is not sufficient. These findings are striking because the women were avoiding pregnancy and were kept blind to the hypotheses, preventing expectation bias. The sexual phase was more robust in women with regular sexual partners, although the increase in sexual desire was just as great in nonpartnered women, who also reported feeling less lonely at this time. We use these results to evaluate potential neuroendocrine mechanisms underlying women's sexual motivation and activity. 相似文献
74.
Raber J 《Science of aging knowledge environment : SAGE KE》2004,2004(11):re2
Increasing evidence indicates that there are reductions in estrogen and androgen levels in aged men and women. These hormonal reductions might be risk factors for cognitive impairments and the development of Alzheimer's disease (AD). Aged people show improved cognition after treatments with sex steroids. Therefore, ongoing clinical AD trials have been designed to evaluate the potential benefits of estrogen therapy in women and testosterone therapy in men. Apolipoprotein E (apoE) plays an important role in the metabolism and redistribution of lipoproteins and cholesterol. The three major human apoE isoforms, apoE2, apoE3, and apoE4, differ in their effects on AD risk and pathology. Here I review various mechanisms proposed to mediate the differential effects of apoE isoforms on brain function and highlight the potential contribution of detrimental isoform-dependent effects of apoE on androgen- and androgen receptor (AR)-mediated pathways. I also discuss potential interactions of androgens with other AD-related factors. 相似文献
75.
The Amsterdam auction has been used to sell real estate in the Dutch capital for centuries. By awarding a premium to the highest losing bidder, the Amsterdam auction favors weak bidders without having the implementation difficulties of Myerson's (1981) optimal auction. In a series of experiments, we compare the standard first‐price and English auctions, the optimal auction, and two variants of the Amsterdam auction. With strongly asymmetric bidders, the second‐price Amsterdam auction raises substantially more revenues than standard formats and only slightly less than the optimal auction. 相似文献
76.
Mati Jacob Mwathi 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2020,31(4):674-687
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - Civil society in Gramscian conception is an arena of hegemonic contestations and therefore essentially political.... 相似文献
77.
The main objective of this work is to propose a method and a tool to support the development of indicators able to inform an organization about the state of its resilience through a cyclical process of identifying its resilience factors, proposing resilience indicators, assessing its organizational resilience followed by assessing and improving the resilience indicators. The research uses concepts from complex adaptive systems and from resilience engineering to establish an initial set of indicators able to assess elements that contribute to organizational resilience, and structures them temporarily as a hierarchy. A software application to support indicator definition and structuring, questionnaire generation, and result assessment activities was built to assist in speeding up the experiment-adjust cycle. Prototype indicators were instantiated with helicopter operating companies in mind, and were reviewed by a domain expert. 相似文献
78.
Jacob Johanssen 《Information, Communication & Society》2018,21(9):1204-1218
ABSTRACTPolitical economists have argued that user activity on corporate social media is regarded as labour that appears playful and fun but is exploited and sold to advertisers for profit maximization. This article begins with the working assumption that such user labour on social media constitutes a form of playing. It is theorized through a psychoanalytic perspective on the term as developed by D. W. Winnicott and André Green. The notion of gaming–playing is put forward to account for set interface structures on Facebook that resemble a game as well as free-flowing dimensions more akin to playing. Some user discourses on Facebook are analysed through this prism. A psychoanalytic conceptualization of user labour as playing allows one to analyse both positive discourses that emphasize Facebook as a space for creativity, exploration and the unknown, as well as negative discourses that critique the platform with regard to lacking privacy controls or data ownership. Both discourses are conducted in a playful manner that creatively utilize a sense of user agency in relation to others and Facebook itself, but often remain without consequences. 相似文献
79.
Investigating the Relationship Between Real Estate Agents,Segregation, and House Prices: Steering and Upselling in New York State 下载免费PDF全文
This article leverages a unique data set, recently developed regression methods, and qualitative interviews to investigate the multiple ways real estate agents produce housing inequality. We find that the clustering of agents in and around certain neighborhoods correlates positively with house prices. Our results also show a significant relationship between agent concentration and racial segregation. Our qualitative data reveal how agents engage in steering and upselling. The findings enhance our understanding of mechanisms in the housing market, and provide more empirical clarity on the role real estate agents play in asset and place inequality. 相似文献
80.
‘I Eat the Vegetables because I Have Grown them with My Own Hands’: Children's Perspectives on School Gardening and Vegetable Consumption 下载免费PDF全文
Asia Sarti Coosje Dijkstra Edris Nury Jacob C. Seidell Christine Dedding 《Children & Society》2017,31(6):429-440
Inadequate vegetable consumption is a global public health concern related to numerous health risks. A promising intervention to increase children's vegetable consumption is school gardening, although earlier studies have shown mixed results. This study explores how gardening might contribute to changed attitudes towards eating vegetables from a child's perspective. Findings are based on qualitative research with children in Amsterdam, the Netherlands. We reflect on how children enact agency regarding their vegetables. Results show that children report that changes occur in their attitudes towards vegetables as they not only eat more vegetables but also advocate the consumption of vegetables at home. 相似文献