Love and hate are intimately linked within the human brain, according to a study that has discovered the biological basis for the two most intense emotions. Scientists studying the physical nature of hate have found that some of the nervous circuits in the brain responsible for it are the same as those that are used during the feeling of romantic love, even though love and hate appear to be polar opposites. But one major difference between the two seems to be in the fact that large parts of the cerebral cortex (associated with reasoning) become deactivated during love, whereas only a small area is deactivated in hate. "This may seem surprising ... But whereas in romantic love, the lover is often less critical and judgemental regarding the loved person, it is more likely that in the context of hate the hater may want to exercise judgement in calculating moves to harm, injure or otherwise exact revenge," a professor involved in the study said.