According to conventional wisdom, babies don’t begin to develop sophisticated psychological reasoning about people until they are about 4 years old. A study of 15-month-olds at the University of Illinois at Urbana-Champaign proves otherwise.
The findings, published in the April 8 issue of the journal Science, potentially could lead to an early screening tool for autism, a developmental disability that is marked by a failure on false-belief and related tasks, the researchers say.