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This is the accepted manuscript of an article published as: Cross-cultural perception of trustworthiness: the effect of ethnicity features on evaluation of faces' observed trustworthiness across four samples.

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Life history theory posits that behavioral adaptation to various environmental (ecological and/or social) conditions encountered during childhood is regulated by a wide variety of different traits resulting in various behavioral strategies. Unpredictable and harsh conditions tend to produce fast life history strategies, characterized by early maturation, a higher number of sexual partners to whom one is less attached, and less parenting of offspring. Unpredictability and harshness not only affects dispositional social and emotional functioning, but may also promote the development of personality traits linked to higher rates of instability in social relationships or more self-interested behavior. Similarly, detrimental childhood experiences, such as poor parental care or high parent-child conflict, affect personality development and may create a more distrustful, malicious interpersonal style. The aim of this brief review is to survey and summarize findings on the impact of negative early-life experiences on the development of personality and fast life history strategies. By demonstrating that there are parallels in adaptations to adversity in these two domains, we hope to lend weight to current and future attempts to provide a comprehensive insight of personality traits and functions at the ultimate and proximate levels.

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The presence of others has long been known to have an effect on people’s decisions to engage in more helping behavior, but relatively few studies have examined the interaction between the observation of the helping act and various personality traits of the altruist person. In the present study, subjects were asked to volunteer by offering a less and a more costly charity service in public and under anonymous conditions. We found that prosocial personality traits showed relative independence of situational factors. Scores on the scale of Machiavellianism, in contrast, proved to be strongly dependent on the presence of others, but not on the cost of the offered charity act. Those obtaining high scores on this scale (high-Mach persons) disguised their selfishness and pretended altruism in the presence of others, but realized their self-interest when others were not observing their behavior. This responsiveness to the strategic distinction between the presence and absence of others is discussed in terms of reputation-gaining and competitive altruism.