) as usual for us to perceive them. An example is children: most people were afraid of the dark at some point when they were little, even if for a short time, after a film, for example, in which there were frightening creatures. After seeing it, in the evening, when they are left alone without a light on, their heart rate increases because they are anxious, the adrenalin level increases, their body is ready to fight-or-fly, because they are afraid that from one corner or the other, such a creature will come out, and so they will hear the quietest noise and notice the lightest change in shadows.
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