Another defining characteristic of Asperger syndrome is the presence of perseverative and obsessive interests in special topics (such as cars or trains, or even more narrow topics such as vacuum cleaners), which may be of little interest to others.
Teine tunnusjoon Aspergeri sündroom on juuresolekul perseverative ja obsessiiv huve konkreetseid teemasid (nagu autod ja rongid, või isegi rohkem kitsad teemad nagu tolmuimejad), mis võib olla vähe huvi teiste.