The psychologists Kristine Onishi and Renee Baillargeon showed that fifteen-month-olds can anticipate a person’s behavior on the basis of his or her false belief. Babies watched as an adult looked at an object in one box, then observed the object move to another box while the adult’s eyes were covered. Later on, they expected the adult to reach into the original box, not the box that actually contained the object. This is a sophisticated psychological inference, the sort of rich understanding of other minds that most psychologists used to believe only four- and five-year-olds were capable of.