Unusual patterns of social and cognitive development, difficulties in social interaction and communication, and restricted interests describe:

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Unusual patterns of social and cognitive development, difficulties in social interaction and communication, and restricted interests are all characteristic of autistic disorder. Rett's disorder is characterized by loss of previously acquired skills, primarily motor skills, and is almost exclusively found in females. Asperger's disorder is characterized by similar social and communication difficulties as autism, but without significant language or cognitive delays. Tourette's disorder is a neurological condition characterized by involuntary tics and movements.

Unusual Patterns of Social and Cognitive Development, Difficulties in Social