Some of the most fundamental questions concerning our evolutionary origins, our social
relations, and the organization of society are centred around issues of altruism and …

The demographic success of humans compared with other closely related species can be
attributed to the relatively rapid pace of reproduction and improved chances of survival. The …

In this book, Robert L. Kelly challenges the preconceptions that hunter-gatherers were
Paleolithic relics living in a raw state of nature, instead crafting a position that emphasizes …

Why do people purchase proenvironmental “green” products? We argue that buying such
products can be construed as altruistic, since green products often cost more and are of …

Social status motivates much of human behavior. However, status may have been a
relatively weak target of selection for much of human evolution if ancestral foragers tended …

Throughout the world people differ in the magnitude with which they value strong family ties
or heightened religiosity. We propose that this cross-cultural variation is a result of a …

Human life histories, as compared to those of other primates and mammals, have at least
four distinctive characteristics: an exceptionally long lifespan, an extended period of juvenile …

Of the many conceptual distinctions present in psychology today, the approach-avoidance
distinction stands out as one of, if not the, most fundamental and basic. The distinction …

Signaling theory provides an opportunity to integrate an interactive theory of symbolic
communication and social benefit with materialist theories of individual strategic action and …

We propose an explanation of cooperation among unrelated members of a social group in
which cooperation evolves because it constitutes an honest signal of the member's quality …