Restricted and repetitive interests and behavior in Aspergers kids...

Kids with Aspergers often display behavior, interests, and activities that are restricted and repetitive and are sometimes abnormally intense or focused. They may stick to inflexible routines, move in stereotyped and repetitive ways, or preoccupy themselves with parts of objects.[15]

Pursuit of specific and narrow areas of interest is one of the most striking features of ASPERGERS.[1] Individuals with ASPERGERS may collect volumes of detailed information on a relatively narrow topic such as dinosaurs, trains or deep fat fryers, without necessarily having genuine understanding of the broader topic.[1][5] For example, a kid might memorize camera model numbers while caring little about photography.[1] This behavior is usually apparent by grade school, typically age 5 or 6 in the United States.[1] Although these special interests may change from time to time, they typically become more unusual and narrowly focused, and often dominate social interaction so much that the entire family may become immersed. Because narrow topics often capture the interest of kids, this symptom may go unrecognized.[5]

Stereotyped and repetitive motor behaviors are a core part of the diagnosis of ASPERGERS and other ASDs.[19] They include hand movements such as flapping or twisting, and complex whole-body movements.[15] These are typically repeated in longer bursts and look more voluntary or ritualistic than tics, which are usually faster, less rhythmical and less often symmetrical.[20]

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