• Publications
  • Influence
Testosterone and financial risk preferences
TLDR
It is found that risk-taking in an investment game with potential for real monetary payoffs correlates positively with salivary testosterone levels and facial masculinity, with the latter being a proxy of pubertal hormone exposure.
Social Networks and Cooperation in Hunter-Gatherers
TLDR
The social networks of the Hadza, a population of hunter-gatherers in Tanzania, are characterized, showing that Hadza networks have important properties also seen in modernized social networks, including a skewed degree distribution, degree assortativity, transitivity, reciprocity, geographic decay and homophily.
Masculine voices signal men's threat potential in forager and industrial societies
TLDR
A new measure of the structure of vocal formant frequencies, ‘formant position’ (Pf), is introduced, which is shown to be more sexually dimorphic and more strongly related to height than is the most widely used measure of formant structure, ’formant dispersion’, in both a US sample and a sample of Hadza foragers from Tanzania.
Salivary testosterone change following monetary wins and losses predicts future financial risk-taking
TLDR
It is found that men who experience a greater increase in bioactive testosterone take on more risk, an association that remains when controlling for whether the participant won the competition, and individual differences in testosterone reactivity, rather than the act of winning or losing, influence financial risk-taking.
Symmetry Is Related to Sexual Dimorphism in Faces: Data Across Culture and Species
TLDR
The findings support the claim that sexual dimorphism and symmetry in faces are signals advertising quality by providing evidence that there must be a biological mechanism linking the two traits during development and suggest that the signalling properties of faces are universal across human populations and are potentially phylogenetically old in primates.
Men's preferences for women's profile waist-to-hip ratio in two societies
Abstract Women's waist-to-hip ratio (WHR) varies with age, and a lower WHR is associated with a higher estrogen-to-androgen ratio and possibly higher fecundity, at least in some populations.
The 7R polymorphism in the dopamine receptor D4 gene (DRD4) is associated with financial risk taking in men
TLDR
This study examined whether there is an association between financial risk preferences, elicited experimentally in a game with real monetary payoffs, and the presence of the 7-repeat allele (7R+) in the dopamine receptor D4 gene as well as the Presence of the A1 allele (A1+) inThe results found no association between the 7R+ and A1.
Preferences for symmetry in human faces in two cultures: data from the UK and the Hadza, an isolated group of hunter-gatherers
TLDR
It is found that symmetry was more attractive than asymmetry across both the cultures and was more strongly preferred by the Hadza than in the UK, implying that symmetry is an evolutionarily relevant trait and that variation in symmetry preference appears strategic both between cultures and within individuals of a single culture.
Androgens and competitiveness in men
In this study, we investigate the association between a number of hormonal variables (circulating testosterone, facial masculinity, 2D:4D digit ratio, and cortisol) and competitiveness in a sample of
Perceived mate fidelity and paternal resemblance predict men's investment in children
Abstract Here, we investigate whether variation in male parental investment can be explained in terms of (1) men's perception of the degree of resemblance between themselves and their offspring and
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