Adam Lanza, the 20-year-old gunman in the Sandy Hook school shooting is thought to have had Asperger's syndrome, a mild form of autism characterized by social awkwardness, but not violence.
Danielle Slota wipes away a tear during a candlelight vigil in remembrance of the Newton, Conn. shooting victims at Green Lake Park in Seattle on Saturday, Dec. 15. The vigil was held after Adam Lanza killed his mother and then killed 20 children and six adults at Sandy Hook Elementary in Connecticut before taking his own life.
Lindsey Wasson/AP
EnlargeWhile an official has said that the 20-year-old gunman in the Connecticut school shooting had?Asperger's?syndrome, experts say there is no connection between the disorder and violence.
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Asperger's?is a mild form of autism often characterized by social awkwardness.
"There really is no clear association between?Asperger's?and violent behavior," said psychologist Elizabeth Laugeson, an assistant clinical professor at the University of California, Los Angeles.
Little is known about Adam Lanza, identified by police as the shooter in the Friday massacre at a Newtown, Conn., elementary school. He fatally shot his mother before going to the school and killing 20 young children, six adults and himself, authorities said.
A law enforcement official, speaking on condition of anonymity because the person was not authorized to discuss the unfolding investigation, said Lanza had been diagnosed with?Asperger's.
High school classmates and others have described him as bright but painfully shy, anxious and a loner. Those kinds of symptoms are consistent with?Asperger's, said psychologist Eric Butter of Nationwide Children's Hospital in Columbus, Ohio, who treats autism, including?Asperger's, but has no knowledge of Lanza's case.
Research suggests people with autism do have a higher rate of aggressive behavior ? outbursts, shoving or pushing or angry shouting ? than the general population, he said.
"But we are not talking about the kind of planned and intentional type of violence we have seen at Newtown," he said in an email.
"These types of tragedies have occurred at the hands of individuals with many different types of personalities and psychological profiles," he added.
Autism is a developmental disorder that can range from mild to severe.?Asperger's?generally is thought of as a mild form. Both autism and?Asperger's?can be characterized by poor social skills, repetitive behavior or interests and problems communicating. Unlike classic autism,?Asperger's?does not typically involve delays in mental development or speech.
Experts say those with autism and related disorders are sometimes diagnosed with other mental health problems, such as depression, anxiety, bipolar disorder or obsessive-compulsive disorder.
"I think it's far more likely that what happened may have more to do with some other kind of mental health condition like depression or anxiety rather than?Asperger's," Laugeson said.
She said those with?Asperger's?tend to focus on rules and be very law-abiding.
"There's something more to this," she said. "We just don't know what that is yet."
After much debate, the term?Asperger's?is being dropped from the diagnostic manual used by the nation's psychiatrists. In changes approved earlier this month, Asperger's?will be incorporated under the umbrella term "autism spectrum disorder" for all the ranges of autism.
AP Writer Matt Apuzzo contributed to this report.
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