Testing whether apes can read minds

In three trials from a new study, apes are shown at upper left watching trials in which an experimenter wearing a gorilla outfit steals a stone from a person behind a mesh screen and then hides the stone under one of two boxes or runs away with it. Red circles denote where each ape is looking during experiments. Looking patterns indicate to researchers that the apes understood when the person held false beliefs about where to find the stone. Read more: Video: C. Krupenye, Fumihiro