Around 75–90% of autistic people develop a special interest, Special interests are often developed between one and four years of age but may not develop until adulthood. A 2014 survey found that the average number of special interests an autistic person has is two, and the average longevity is 13 years. They were tied to a condition today considered autism by Soviet child psychiatrist
Grunya Sukhareva in 1925. In November 1940,
Lauretta Bender and
Paul Schilder published a paper focused on the topic. Bender and Schilder's contemporaries like
Hans Asperger and
Leo Kanner also wrote about the matter, which was important to the development of autism awareness. The
ICD-11 lists special interests as part of a broader category in its diagnostic criteria, described as "persistent preoccupation with one or more special interests, parts of objects, or specific types of stimuli (including media) or an unusually strong attachment to particular objects". Common areas of special interests include transportation, animals, sports, music, fictional characters, sensory experiences, and popular culture. Special interests of autistic girls may be overlooked if the area is considered more "typical" or socially oriented, though a 2024 study found more similarities than differences in the characteristics of special interests in autistic boys and girls. Autistic people with
obsessive-compulsive disorder may experience intrusive thoughts or compulsive behaviors connected to their special interest. A participant in a 2024 study explained, "I think [OCD] is quite closely linked with autism because my special interest... is medicine... I really like to care for people. I would never want to do anybody harm. I want to be a good person if I can. So, I kind of wonder if the reason I have these obsessions is because I’m so concerned about that." == Engagement ==