Psychologists must be able to test both for the presence of an effect and for the absence of
an effect. In addition to testing against zero, researchers can use the two one-sided tests …

What role does the experience of feeling what you think others are feeling–often known as
'empathy'–have in moral deliberation and moral action? Empathy has many fans and there …

We introduce and investigate the philosophical concept of 'speciesism'—the assignment of
different moral worth based on species membership—as a psychological construct. In five …

Abstract [Correction Notice: An Erratum for this article was reported in Vol 125 (2) of
Psychological Review (see record 2018-15704-001). The copyright attribution was …

When do people find it acceptable to sacrifice one life to save many? Cross-cultural studies
suggested a complex pattern of universals and variations in the way people approach this …

Scholars have been using hypothetical dilemmas to investigate moral decision making for
decades. However, whether people's responses to these dilemmas truly reflect the decisions …

Moral judgments play a critical role in motivating and enforcing human cooperation, and
research on the proximate mechanisms of moral judgments highlights the importance of …

Research on sex differences in empathy has revealed mixed findings. Whereas
experimental and neuropsychological measures show no consistent sex effect, self-report …

Research on moral dilemma judgments has been fundamentally shaped by the distinction
between utilitarianism and deontology. According to the principle of utilitarianism, the moral …

Researchers have used “sacrificial” trolley-type dilemmas (where harmful actions promote
the greater good) to model competing influences on moral judgment: affective reactions to …