- From [[Autism]]: "Autistics sometimes have a persistent, intense
preoccupation. For example, the child might be obsessed with learning all about vacuum cleaners, train schedules or lighthouses."
- From [[Asperger's syndrome]]: "Asperger syndrome can involve an
intense and obsessive level of focus on things of interest...Particularly common interests are means of transport (such as trains), computers, and dinosaurs."
This is an example of [[affirming the consequent]].