A new study has shown that toddlers as young as two-and-a-half years old can understand when others have different thoughts from them – much earlier than the age of four as traditionally thought. This suggests that children may know when adults are lying or pretending.
The finding is made by developmental psychologists Assistant Professor Setoh Pei Pei from Nanyang Technological University, Singapore (NTU Singapore), Assistant Professor Rose Scott from the University of California Merced, and Professor Renée Baillargeon from the University of Illinois, who studied the behaviour of more than 140 children in the United States aged two-and-a-half years old.
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