According to CNN, Studies have shown that brain injury increases the risk of violent and aggressive behavior. Damage or abnormalities in the frontal lobe -- a brain area that regulates movement, inhibition, emotions and general behaviors -- has been linked to violent behavior. A 2007 study from the American Journal of Psychiatry found an association between violence and cortical thinning in some areas of the frontal lobe.
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Damage to the brain's temporal lobe, which contains structures involved in fear response, has also been suggested to have a connection to violence. "If a person has damage to the frontal or the temporal lobe, perhaps they cannot identify or evaluate the fear appropriately, and perhaps their response is of a more physical nature," Segal said.
Other warning signs include feelings of being hopeless, ashamed and trapped, Raison said. People with these feelings may announce ahead of time that they are going to kill someone else or themselves, which increases the likelihood that they will follow through with violence.
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according to this article, people with these brain problems often make it known when they're about to commit suicide. whenever this is noticed, people like this need to socialize more. lack of socializing can lead to unpleasant thoughts.
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