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Different Types of Autism Spectrum Disorders In Child and Adults
Autistic Disorder (sometimes called “classical autism”) is that the commonest condition during a group of developmental disorders referred to as the autism spectrum disorders (ASD). Classic autism is characterized by impaired social interaction, problems with verbal and nonverbal communication, and weird, repetitive, or severely limited activities and interests (National Institute of Neurological Disorders and Stroke, 2005a).

Three distinctive behaviors characterize children with classic autism. These children have difficulties with social interaction, problems with verbal and nonverbal communication, and repetitive behaviors or narrow, obsessive interests. The behaviors can home in impact from mild to disabling. Other common symptoms of classic autism include (Westling & Fox, 2004; Deutsch-Smith, 2004; Heward, 2006; Gargiulio, 2004):

• Difficulty in expressing needs; uses gestures or pointing rather than words
• Difficulty in concerning and mixing in with others
• doesn’t answer normal teaching methods
• doesn’t respond to verbal cues
• Exhibits minimal or no eye contact
• Exhibits over‐sensitivity or under‐sensitivity to pain
• Exhibits physical over‐activity or extreme under‐activity
• Has difficulty expressing and receiving physical affection
• Has no real fears of danger
• Maintains inappropriate attachments to things
• Motor skills are uneven
• Often exhibits tantrums
• Prefers to be alone; aloof manner
• Repetition of words or phrases in situ of normal, responsive language
• Resistance to vary
• Spins objects
• Sustained odd play

According to the Autism Society of America (2005), there’s no known single cause for autistic disorder, but it’s generally accepted that it’s caused by abnormalities in brain structure or function. Brain scans show differences within the shape and structure of the brain in autistic versus non-autistic children.

Researchers are investigating a variety of theories, including the link between heredity, genetics, and medical problems. In many families, there appears to be a pattern of autism or related disabilities, further supporting a genetic basis to the disorder (National Institute of Neurological Disorders and Stroke, 2005a).

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While nobody gene has been identified as causing autism, researchers are checking out irregular segments of ordering that autistic children may have inherited. It also appears that some children are born with a susceptibility to autism, but researchers haven’t yet identified one “trigger” that causes autism to develop.

Childhood Disintegrative Disorder
Childhood disintegrative disorder may be a condition occurring in 3- and 4-year-olds who have developed normally to age 2. Over several months, a toddler with this disorder will deteriorate in intellectual, social, and language working from previously normal behavior (U.S. National Library of drugs 2004b). Childhood disintegrative disorder develops in children who have previously seemed perfectly normal. Typically language, interest within the social environment, and sometimes toileting and self-care abilities are lost, and there could also be a general loss of interest within the environment. the kid usually involves look very ‘autistic’, i.e., the clinical presentation (but not the history) is then typical of a toddler with ASD (Yale Developmental Disabilities Clinic, 2006). An affected child shows a loss of communication skills, features a regression in nonverbal behaviors, and significant loss of previously-acquired skills. The condition is extremely almost like classic autism.

Symptoms of Childhood Disintegrative Disorder may include (U.S. National Library of drugs 2004b):

• Loss of social skills
• Loss of bowel and bladder control
• Loss of expressive or receptive language
• Loss of motor skills
• Lack of play
• Failure to develop peer relationships
• Impairment in nonverbal behaviors
• Delay or lack of speech
• Inability to start or sustain a conversation

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