MIAMI – Orangutans, chimpanzees and bonobos are the nearest relatives of humans in the primate world, and like us, they can tell when a person is wrong in their beliefs, researchers said Wednesday. Great apes were also willing to help a person who was mistaken about the location of an object, according to the study in the journal PLOS ONE. "This study shows for the first time that great apes can use an understanding of false beliefs to help others appropriately," said by David Buttelmann from Max Planck Institute for Evolutionary Anthropology, Germany. Researchers used a test developed for human babies, about 18 months of age, to determine if they could understand when a person held a false belief -- a mark of advanced social cognition. A person would place an object on one of two boxes, while a great ape looked on.