School violence

School violence is widely held to have become a serious problem in recent decades in many countries, especially where weapons such as guns or knives are involved. It includes violence between school students as well as physical attacks by students on school staff.

A distinction is made between internalizing and externalizing behavior. Internalizing behaviors reflect withdrawal, inhibition, anxiety, and/or depression. Internalizing behavior has been found in some cases of youth violence although in some youth, depression is associated with substance abuse. Because they rarely act out, students with internalizing problems are often overlooked by school personnel. Externalizing behaviors refer to delinquent activities, aggression, and hyperactivity. Unlike internalizing behaviors, externalizing behaviors include, or are directly linked to, violent episodes. Violent behaviors such as punching and kicking are often learned from observing others. Just as externalizing behaviors are observed outside of school, such behaviors also observed in schools.

A number of other individual factors are associated with higher levels of aggressiveness. Compared to children whose antisocial conduct begins in adolescence, early starters have a worse prognosis in terms of future aggression and other antisocial activities. Lower IQ is related to higher levels of aggression. Other findings indicate that in boys early problematic motor skills, attentional difficulties, and reading problems predict later persistent antisocial conduct.

The home environment is thought to contribute to school violence. The Constitutional Rights Foundation suggests long-term exposure to gun violence, parental alcoholism, domestic violence, physical abuse of the child, and child sexual abuse teaches children that criminal and violent activities are acceptable. Harsh parental discipline is associated with higher levels of aggressiveness in youth. There is some evidence indicating that exposure to television violence and, to a lesser extent, violent video games is related to increased aggressiveness in children, which, in turn, may carry over into school.

Straus adduced evidence for the view that exposure to parental corporal punishment increases the risk of aggressive conduct in children and adolescents. Straus's findings have been contested by Larzelere and Baumrind. A meta-analysis of the vast literature on corporal punishment, however, indicates that corporal punishment is related to poorer outcomes in children and youth. The methodologically soundest studies indicate "positive, moderately sized associations between parental corporal punishment and children’s aggression." Gershoff found that the trajectory of mean effect sizes (the size of the effect of corporal punishment on children's problem behavior) was curvilinear with the largest mean effect size in middle school (M = 0.55; on average the mean of corporal punishment group was more than half a standard deviation higher than the mean of the non-punishment group) and slightly smaller effect sizes in grade school (M = 0.43) and high school (M = 0.45).

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