ScienceDaily (Feb. 18, 2012) — “That’s not fair!” It’s a common playground complaint. But how early do children acquire this sense of fairness? Before they’re 2, says a new study. “We found that 19- and 21-month-old infants have a general expectation of fairness, and they can apply it appropriately to different situations,” says University of Illinois psychology graduate student Stephanie Sloane, who conducted the study with UI’s Renée Baillargeon and David Premack of the University of Pennsylvania.
The findings appear in Psychological Science, a journal published by the Association for Psychological Science.
In each of two experiments, babies watched live scenarios unfold. In the first, 19-month-olds saw two giraffe puppets dance around at the back of a stage. An experimenter arrived with two toys on a tray and said, “I have toys!” “Yay!” said the giraffes. Then the experimenter gave one toy to each giraffe or both to one of them. The infants were timed gazing at the scene until they lost interest. Longer looking times indicated that something was odd — unexpected — to the baby. In this experiment, three-quarters of the infants looked longer when one giraffe got both toys.