... is only found in females and most are retarded. This syndrome develops between the ages of six months to eighteen months. Rett's begins with a normal state of development, then the victim regresses in skills such as speech, hand movements, and social skills, along with other signs of central nervous ... 's syndrome is probably the closest to primary autism. Landua-Kleffner syndrome is also found in males and females. Victims with this disorder appear normal until between the ages of three to seven, which is when regression is noticeable. They lose the ability to talk and show great socia...

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• Grade Level: High School