Autism

People with autism typically have a reduced ability with theory of mind, which means they have trouble understanding the emotions and the feelings of other people. When we say that autism is a spectrum, it's important to realize it's not linear. It's more like a tree with many branches. Some people have autistic symptoms and behaviors that are on one of those branches, and the same people might have none on the other branches. So to sum up overall, the underlying causes of autism are not clear.