You're sleeping comfortably when a loud noise wakes you up. You sit up, totally alert, with your heart pounding, straining every sense to try to identify the source of the sound. At first, you will probably 'freeze', then you may hide under the bed or grab something heavy and tiptoe downstairs ... Fear is a feeling that we are all familiar with. There are some contexts in which most, if not all human beings can feel fear, such as a life-threatening situation or...