Human social groups are central to social organization and pervasively impact interpersonal
interactions. Although immensely varied, all social groups can be considered specific …

Social categorization is a universal mechanism for making sense of a vast social world with
roots in perceptual, conceptual, and social systems. These systems emerge strikingly early …

Although psychologists have paid scant attention to the sense of obligation as a distinctly
human motivation, moral philosophers have identified two of its key features: First, it has a …

Whether upheld as heroic or reviled as terrorism, people have been willing to lay down their
lives for the sake of their groups throughout history. Why? Previous theories of extreme self …

Scholars from across the social sciences, biological sciences, and humanities have long
emphasized the role of human morality in supporting cooperation. How does morality arise …

Recent research suggests that the foundations of human moral cognition include abstract
principles of fairness and ingroup support. We examined which principle 1.5-y-old infants …

To successfully navigate their social world, humans need to understand and map enduring
relationships between people: Humans need a concept of social affiliation. Here I propose …

For over 35 years, the violation-of-expectation paradigm has been used to study the
development of expectations in the first 3 years of life. A wide range of expectations has …

Overt expressions of racial intolerance have surged precipitously. The dramatic uptick in
hate crimes and hate speech is not lost on young children. But how, and how early, do …

The Parental Brain: Mechanisms, Development, and Evolution presents a comprehensive
analysis of how the brain regulates parental behavior in nonhuman animals and in humans …