According to Laboratory of Neurobiology in University College London, the hatred you feel against an individual occurs in the same parts of the brain as the love does. In this study, Semir Zeki and John Paul Romaya used 17 people as subjects and showed them pictures of a person they hated – an ex-lover, or a competitor at work.
They scanned their brains during this session, and determined which part of the brain was at work when the hatred occurred. The results turned out pretty surprising. They found that the two specific parts of the brain, the putamen and the insula played a role during the “hate circuit”.
What seems to be so surprising is that these two parts are also associated with passion, romance, and love. This also proves the common association between love and hate, and how one of these can easily transform into the other.