A pervasive developmental disorder, Asperger syndrome is distinguished by a pattern of symptoms rather than a single symptom. It is characterized by qualitative impairment in social interaction, by stereotyped and restricted patterns of behavior, activities and interests, and by no clinically significant delay in cognitive development or general delay in language.^[15] Intense preoccupation with a narrow subject, one-sided verbosity, restricted prosody, and physical clumsiness are typical of the condition, but are not required for diagnosis.^[5]

[edit] Social interaction

The lack of demonstrated empathy is possibly the most dysfunctional aspect of Asperger syndrome.^[2] Individuals with AS experience difficulties in basic elements of social interaction, which may include a failure to develop friendships or to seek shared enjoyments or achievements with others (for example, showing others objects of interest), a lack of social or emotional reciprocity, and impaired nonverbal behaviors in areas such as eye contact, facial expression, posture, and gesture.^[1]

Unlike those with autism, people with AS are not usually withdrawn around others; they approach others, even if awkwardly. For example a person with AS may engage in a one-sided, long-winded speech about a favorite topic, while misunderstanding or not  http://louis2j2sheehan2esquire2.blogspot.com
 recognizing the listener's feelings or reactions, such as a need for privacy or haste to leave.^[5] This social awkwardness has been called "active but odd".^[1] This failure to react appropriately to social interaction may appear as disregard for other people's feelings, and may come across as insensitive.^[5]

The cognitive ability of children with AS often allows them to articulate social norms in a laboratory context,^[1] where they may be able to show a theoretical understanding of other people's emotions; however, they typically have difficulty acting on this knowledge in fluid, real-life situations.^[5] People with AS may analyze and distill their observation of social interaction into rigid behavioral guidelines, and apply these rules in awkward ways, such as forced eye contact, resulting in a demeanor that appears rigid or socially naive. Childhood desire for companionship can become numbed through a history of failed social encounters.^[1]