Monotropism is a processing style, or way of thinking. Monotropic people tend to focus strongly on a small number of things at a time, and miss things outside of their attention tunnel — or quickly forget things they are no longer focusing on. Autistic people and ADHDers are more likely to be monotropic than others. They might experience some things intensely, and often find it hard to shift their attention from one thing to another. This can result in passionate interests that some people might find unusual.