Peter Medawar Quotes

“If the experience is familiar and known as safe, the brain’s stress system will not be activated. However, if the incoming information is initially unfamiliar, new or strange, the brain instantly begins a stress response. How extensively these stress systems are activated is related to how threatening the situation appears. It’s important to understand that our default is set at suspicion, not acceptance. At a minimum, when faced with a new and unknown pattern of activity, we become more alert. The brain’s goal at this point is to get more information, to examine the situation and determine just how dangerous it might be. Since humans have always been the deadliest animal encountered by other humans, we closely monitor nonverbal signals of human menace, such as tone of voice, facial expression and body language.”