Also, scientists measured brain activity of people on the autism spectrum with fMRI while they were thinking about their own emotions. They found activity in the same brain regions as in non-autistic people. The difference was that some regions which are important for thinking about oneself and emotions (especially the anterior insula) were less active in autistic people. Other brain regions were much more active. These findings may explain the difficulties people with autism experience when trying to understand complex facial expressions and emotions (such as shame, jealousy).