Researchers say that building a Theory of mind is one of the main problems for autistic people. This makes it difficult for them to interact with others. Problems in social interaction are probably worsened by low preference for social stimuli, such as faces. This tendency has been found in studies tracking the person’s eye movements and in EEG studies. EEG studies showed lower than normal activity in the fusiform face area (FFA), a brain region that is usually active when seeing faces. However, the results of other studies could not show this.