The human being has its own characteristics regarding the stranger’s face. The fear of that over which we have no control, which can, in theory, subjugate and defeat us is so strongly ingrained in our brains, we prefer to avoid the unknown. The brain has an archaic mechanism of recording previous experiences of pain and trauma. These memories are recorded in the brain, in structures located in each of the cerebral hemispheres. They associate with other structures, such as the limbic system, orchestrating an immediate defense reaction when an event we experience threatens us.