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Psychologists define aggressive actions as those which involve an intention to harm or result in harm to others. The component of intention to harm is a critical issue. If the child accidentally knocks another child off some play equipment by mistake, it would be unfair to call this a very aggressive act because of the harmful consequences, when the intention was not present.
Instrumental and Hostile Aggression
Psychologists have distinguished between two types of aggression:
Age-related Changes in Aggression
Very young children will hit and smack. It is hard to see this as aggression and is most likely simply related to frustration a child feels at not being able to do something. At around 20-23 months, the child may begin to show signs of instrumental aggression.
Two studies by Goodenough (1931) and Hartup (1974) found the following stages of aggression in children:
2-3 years –
Children are most often aggressive to parents who have angered or thwarted them.
Over 3 –
The tendency to retaliate in response to frustration or attack increases dramatically.
About age 4 –
The child will stop having unfocused temper tantrums, although the amount of aggression that children display peaks at around this time.
5 years plus –
The number of aggressive exchanges is less common in five years olds than in younger children. This may coincide with children starting school and being unwilling to tolerate aggressive acts. Children will have learned that violence can hurt them too. However, the level of hostile aggression increases. Hartup argued that this was due to the idea of role-taking. The child will infer that another child is trying to hurt them, so they will retaliate and hurt them back. The older a child gets the more likely they are to accurately infer the cues from another.
Is Aggression a Stable Attribute?
An attribute is a statement about the cause of a behaviour. Aggression is reasonably stable during the preschool period to early adolescence (Emmerich, 1966). Highly aggressive 3-year-olds are likely to become highly aggressive five-year-olds. A child with high levels of physical and verbal aggression between 6 and 10 years of age is likely to continue with their tendency to hurt, insult, tease and compete with others when 10-14 years of age.
Previously it was thought that childhood aggression in males was a good indicator of aggression in adulthood. However, recent research has found this to be the case for both sexes. Huesman, Eron, Lefkowitz and Walder (1984) found that childhood measures of aggression at age 8 were good predictors of adult aggression at 30. Caspi, Elder and Ben (1987) found that boys and girls who were moody, ill-tempered and aggressive at 10 tended to be ill-tempered young adults who had relationships full of conflict and unpleasantness with their spouse and children. This does not mean that aggressive children will automatically become aggressive adults, but aggression is a reasonably stable attribute. Factors like upbringing, environment, culture and social skills can also influence aggression in children.
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