# Infants’ Insight into the Mind **Opening (not a real abstract):** lthough primates and other animals seem to have some understanding of mind (that is, the behavior of others), the concept of belief seems to be a specifically human ability. Comprehending false belief is the clearest sign of understanding a critical aspect of the mind: its subjectivity and its susceptibility to manipulation by information. It is thought that children develop an understanding of false belief around 4 years of age. However, on page 255 of this issue, Onishi and Baillargeon (1) report that infants as young as 15 months have insight into whether a person acts on the basis of a mistaken view (false belief) about the world. This discrepancy touches on important issues. An understanding of false belief at 4 years of age suggests that J. Perner is in the Department of Psychology, Ruffman is in the Department of Psychology, **Authors:** [[Perner Ruffman 2005]]