It is true that athletes who participate in body contact sports score higher on tests of aggression. This is an example of construct validity.
Aggression is an overt or covert, often harmful social interaction intended to harm or hurt another person. For some, it can be directed toward creative and practical outlets, which can occur reactively or without provocation. In humans, aggression can be triggered by a variety of triggers, from frustration with blocked targets to feelings of being neglected. Human aggression can be divided into direct aggression and indirect aggression. The former is characterized by physical or verbal behavior aimed at harming someone, while the latter is characterized by behavior aimed at undermining the social relationships of an individual or group.
A commonly used definition in social and behavioral sciences is aggression, behavior, or reaction that causes something unpleasant to happen to another person. Some definitions include that the person must have the intention of harming others.
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