Human beings are hardwired for empathy. Mirror neurons in our brain are programmed to mimic the experiences of those around us, so that we literally feel what they feel. The brainstem, origin of the fight or flight response, is always scanning the environment for information about potential threats or danger. Much of this data is absorbed unconsciously from the reactions and expressions of those around us. The brainstem also houses the nuclei for facial expressions and tone of voice, involuntarily broadcasting the way we feel even if we are trying to hide our emotions. This potential sensitivity to others and what they are going through has a strong value in nature – generally the more integrated and connected a group is the higher its chances of survival.