The World Health Organization defines Asperger's Syndrome as one of the Autism Spectrum Disorders (ASD) or Diffuse Developmental Disorder (ASD), which is a range of psychological conditions characterized by abnormalities in social interaction and communication that make daily communication difficult. as well as by limited and repetitive interests and behaviors.
As a pervasive developmental disorder, Asperger syndrome is characterized by a pattern of symptoms rather than a single symptom. It is characterized by a qualitative attenuation of social interaction, by stereotypes and limited patterns of behavior, activities and interests, no clinically significant delay in cognitive development or a general delay in language. Characteristics of the syndrome are intense preoccupation with a narrow object, unilateral pluralism, limited prosody, and physical awkwardness.
These individuals have difficulty with key elements of social interaction, which may include failure to develop friendships, seeking common pleasures or accomplishments with others (for example, showing them objects of interest), lack of social or emotional reciprocity. (social "games" with give and take mechanism), and nonverbal behavior disorder in areas such as eye contact, facial expressions, posture, and gestures.
However, not all people with AS approach others. Some of them may even show selective dumbness, ie not talking to most people at all and talking too much to specific people. Some may choose to speak only to people they like.
Although people with Asperger's syndrome acquire language skills without significant general delay and their speech does not usually have significant abnormalities, language learning and use is often informal. Anomalies include pluralism, abrupt transitions, literal interpretations and misinterpretations of nuances of concepts, use of metaphor only with the speaker, deficits in auditory perception, unusual meticulousness, formal or idiosyncratic speech, and paradoxes in the intensity and volume of sound. Echolalia has also been observed in people with AS. Children with Asperger's Syndrome are more likely to have sleep problems, including difficulty sleeping, frequent nocturnal awakenings, and early morning awakenings. AS is also associated with high levels of paralysis, which is related to the difficulty in recognizing and describing one's emotions.