Preschoolers and toddlers use ownership to predict basic emotions.

People's emotions often depend on ownership. We report 3 experiments showing that preschoolers and toddlers consider ownership in predicting basic emotions. In Experiment 1, 3-year-olds were sensitive to ownership when predicting how a character would feel when objects went missing. Experiment 2 found that 3- to 5-year-olds consider ownership when predicting emotional reactions to harmless violations of ownership rights, and Experiment 3 showed 2-year-olds also do this. For instance, preschoolers and toddlers predicted a girl would be upset when a boy played with her teddy bear without permission, but not when he played with his own. These findings show that preschoolers and toddlers understand basic causal relations between ownership and emotions, and are also the first to show that 2-year-olds are sensitive to other people's ownership rights.