The reasons for antisocial behavior are both complicated and varied.

反社会行为的原因既复杂又多样。

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Overall, the researchers found, marriage seemed to reduce antisocial behavior by 30 percent.

研究者们发现，总体而言，婚姻使反社会行为减少了30%。

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In contrast, negative perceptions of others are linked to higher levels of narcissism and antisocial behavior.

相反，对他人负面的认知则反映出很大程度的自恋，以及反社会的行为倾向。

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These connections held true even when other factors during childhood, like parenting, antisocial behavior early on, and socioeconomic status were taken out of the equation.

FORBES: Could Too Much TV In Childhood Lead To Antisocial Behavior In Adulthood?

"There may be many, many people who also have psychopathic tendencies and have similar scans, who don't do antisocial behavior, who don't rape and kill, " Brodie says.

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They found that a genotype conferring low levels of the enzyme monoamine oxidase A (MAOA), when combined with early child abuse, predisposed the individual to later antisocial behavior.

WSJ: Neurocriminology: Inside the Criminal Mind