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Nearly 25 years ago, four studies examined the development of social value orientation (SVO) and uncovered that SVO was related to specific and general adult attachment, the number of siblings, and age. However, some of these findings have been challenged by two recent replication studies. The present (pre-registered) research extends these replication studies and the original research by using multiple measurements of both SVO and adult attachment on two large samples that allowed us to detect small effect sizes. With online samples (N = 1446 and 2644) from MTurk and Prolific, we replicated earlier findings that prosociality was associated with a greater level of secure attachment and a lower level of avoidant attachment. Moreover, prosociality was positively related to the number of siblings, especially sisters, as discovered by Study 3 of the original study. However, we failed to replicate the significant relation between SVO and age. Generally, we conclude that prosocial orientation is associated—even if modestly—with secure and avoidant attachment and the number of siblings, but the link with age is a question open to future investigation. [ABSTRACT FROM AUTHOR]

Abstract: Interdependent situations are pervasive in human life. In these situations, it is essential to form expectations about the others' behaviour to adapt one's own behaviour to increase mutual outcomes and avoid exploitation. Social value orientation, which describes the dispositional weights individuals attach to their own and to another person's outcome, predicts these expectations of cooperation in social dilemmas—an interdependent situation involving a conflict of interests. Yet, scientific evidence is inconclusive about the exact differences in expectations between prosocials, individualists, and competitors. The present meta‐analytic results show that, relative to proselfs (individualists and competitors), prosocials expect more cooperation from others in social dilemmas, whereas individualists and competitors do not significantly differ in their expectations. The importance of these expectations in the decision process is further highlighted by the finding that they partially mediate the well‐established relation between social value orientation and cooperative behaviour in social dilemmas. In fact, even proselfs are more likely to cooperate when they expect their partner to cooperate. Copyright © 2018 European Association of Personality Psychology [ABSTRACT FROM AUTHOR]

The present study examines a two-person give-some dilemma characterized by the conflict between the pursuit of own benefits (not giving) and collective benefits (giving). The major purpose was two-fold: (a) to examine the effects of person perceptions manipulated along the dimensions of morality (goodness) and potency (strength) on co-operation, and (b) to examine whether pre-existing differences between individuals in their preference for specific self-other outcome distributions (social values) would modify the effects of person perception. First, we predicted and found that across social values the degree of co-operative behaviour increased as a linear function of the extent to which the other was seen as moral. Concerning the perceptions in terms of potency, we found a significant quadratic trend; another seen as moderate on potency elicited more co-operative behaviour than another seen as either high or low on potency. These effects of person perception were not moderated by social value. More interesting was the finding that even though persons classified as pro-social (co-operators and altruists) and pro-self (individuals and competitors) held about the same expectation about the magnitude of another's co-operation, pro-socials behaved more co-operatively than pro-self. This suggests that under certain conditions behavioural differences pro-socials and pro-self are not conditional upon expectational differences between those two social values. [ABSTRACT FROM AUTHOR]