18-month old humans discriminate moral violations from disobedient or unexpected events

Fascinating studies from Kassecker et al. (open source) have used multiple methods (eye-tracking, observations of expressive behaviors) to probe the developmental origins of human moral cognition by assessing infants’ ability to differentiate between prototypical harmful (moral) and harmless (conventional) violations:

Humans reason and care about ethical issues, such as avoiding unnecessary harm. But what enables us to develop a moral capacity? This question dates back at least to ancient Greece and typically results in the traditional opposition between sentimentalism (the view that morality is mainly driven by socioaffective processes) and rationalism [the view that morality is mainly driven ...