Human Nature
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The ratio of index- and ring-finger lengths (2D:4D ratio) is thought to be related to prenatal androgen exposure, and in many, though not all, populations, men have a lower average digit ratio than do women. In many studies an inverse relationship has been observed, among both men and women, between 2D:4D ratio and measures of athletic ability. It has been further suggested that, in hunter-gatherer populations, 2D:4D ratio might also be negatively correlated with hunting ability, itself assumed ...
#1Peter B. GrayH-Index: 27
Last. Brian M. WoodH-Index: 17
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#1Luseadra McKerracher (SFU: Simon Fraser University)H-Index: 4
#2Pablo A. Nepomnaschy (SFU: Simon Fraser University)H-Index: 9
Last. Mark Collard (SFU: Simon Fraser University)H-Index: 33
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Variation in the durations of exclusive breastfeeding (exBF) and any breastfeeding (anyBF) is associated with socioecological factors. This plasticity in breastfeeding behavior appears adaptive, but the mechanisms involved are unclear. With this concept in mind, we investigated whether durations of exBF and anyBF in a rural Maya population covary with markers of a form of socioecological change—market integration—and whether individual factors (individual learning, physiological plasticity) and/...
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#1Francesca R. Luberti (UNSW: University of New South Wales)H-Index: 2
#2Khandis R. Blake (UNSW: University of New South Wales)H-Index: 8
Last. Robert Brooks (UNSW: University of New South Wales)H-Index: 54
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Sociopolitical attitudes are often the root cause of conflicts between individuals, groups, and even nations, but little is known about the origin of individual differences in sociopolitical orientation. We test a combination of economic and evolutionary ideas about the degree to which the mating market, sex, age, and income affect sociopolitical orientation. We collected data online through Amazon’s Mechanical Turk from 1108 US participants who were between 18 and 60, fluent in English, and sin...
#1Rosemary L. Hopcroft (UNCC: University of North Carolina at Charlotte)H-Index: 10
Evolutionary theory predicts that social status and fertility will be positively related. It also predicts that the relationship between status and fertility will differ for men and women. This is particularly likely in modern societies given evidence that females face greater trade-offs between status and resource acquisition and fertility than males. This paper tests these hypotheses using newly released data from the 2014 wave of the Survey of Income and Program Participation by the US Census...
#1Brooke A. ScelzaH-Index: 15
#2Katie Hinde (ASU: Arizona State University)H-Index: 1
Last. Katie HindeH-Index: 5
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Maternal grandmothers play a key role in allomaternal care, directly caring for and provisioning their grandchildren as well as helping their daughters with household chores and productive labor. Previous studies have investigated these contributions across a broad time period, from infancy through toddlerhood. Here, we extend and refine the grandmothering literature to investigate the perinatal period as a critical window for grandmaternal contributions. We propose that mother-daughter co-resid...
#1Eva Unternaehrer (McGill University)H-Index: 6
#2Katherine T. Cost (U of T: University of Toronto)H-Index: 1
Last. Alison S. Fleming (U of T: University of Toronto)H-Index: 57
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Animal and human studies suggest that parenting style is transmitted from one generation to the next. The hypotheses of this study were that (1) a mother’s rearing experiences (G1) would predict her own parenting resources (G2) and (2) current maternal mood, motivation to care for her offspring, and relationship with her parents would underlie this association. In a subsample of 201 first-time mothers participating in the longitudinal Maternal Adversity, Vulnerability and Neurodevelopment projec...
Fairness is undoubtedly an essential normative concept in humans and promotes cooperation in human societies. The fact that fairness exists is puzzling, however, because it works against the short-term interest of individuals. Theories of genetic evolution, cultural evolution, and gene-culture coevolution identify plausible mechanisms for the evolution of fairness in humans. Such mechanisms include kin selection, the support of group-beneficial moral norms through ethnic markers, free partner ch...
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