Humans are an intensely social species, frequently performing costly behaviors that benefit
others. Efforts to solve the evolutionary puzzle of altruism have a lengthy history, and recent …

The occurrence of cooperation poses a problem for the biological and social sciences.
However, many aspects of the biological and social science literatures on this subject have …

Since Hamilton published his seminal papers in 1964, our understanding of the importance
of cooperation for life on Earth has evolved beyond recognition. Early research was focused …

Context: Increased attention has been placed on the role of technological artefacts in the
promotion of prosocial behaviours. However, up to this date, there is still no systematic …

In a classic study, Haley and Fessler showed that displaying subtle eye-like stimuli caused
participants to behave more generously in the Dictator Game. Since their paper was …

Previous research suggests that children develop an increasing concern with fairness over
the course of development. Research with adults suggests that the concern with fairness has …

Humans use punishment to promote cooperation in laboratory experiments but evidence
that punishment plays a similar role in non-human animals is comparatively rare. In this …

We teach on Rutgers University's campus in New Brunswick, New Jersey, located in the
southern part of the New York metropolitan area. On September 11, 2001, Beth was …

Some researchers have proposed that natural selection has given rise in humans to one or
more adaptations for altruistically punishing on behalf of other individuals who have been …

It has become an accepted paradigm that humans have “prosocial preferences” that lead to
higher levels of cooperation than those that would maximize their personal financial gain …