Studies showed that part of the brain putamen (connected to the perception of contempt and disgust) and the insula activated when people see someone they hate. These parts of the brain also activated by romantic love. The putamen could also be involved in the preparation of aggressive acts in a romantic context during the rival situation. It is fascinating to see how both hate and love lead one to make irrational, heroic and evil decisions. The two opposite sentiments lead to the same behaviour because they are triggered from the same part of the brain.
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