Monotropism is a cognitive theory. It is a tendency to focus attention on one thing at a time, with difficulty shifting attention and processing multiple stimuli which might support understanding.
To understand Monotropism in autistic children and young people and why transitioning from their "attention tunnel" needs a different approach, watch the video below.
https://monotropism.org/wp-content/uploads/2022/05/Monotropism-animation.mp4