The behavior of a mother who slaps her son whenever he engages in aggression is negative reinforcement. Probably after she slaps him, your son will behave less aggressively.
Negative reinforcement can be understood as a method to teach and prevent certain behaviors, through an aversive stimulus, which removes the behavior.
Therefore, this method should not be used through any type of violence, as negative reinforcement will always use some degree of fear to eliminate a behavior, which can generate an increase in stress, hostility, and negative feelings.
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