Try this experiment at home with a friend: close your eyes and have your friend slap you across the face (probably don’t choose a friend who would take some sort of sick pleasure in hitting you as hard as possible). Wait a minute or so and then repeat the experiment with your friend softly caressing your face instead. Now, compare these two experiences and how you perceived them. The slap and the caress both involved someone else touching the same area of skin, alerting sensory neurons beneath the skin and causing an electrochemical impulse to move through the nervous system…
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