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Our feet are filled with sensitive nerve endings. When stroked lightly, these nerves send the sensations to our brains, creating that tickling feeling.
While light tickling can be pleasant for some people, prolonged exposure can actually become quite painful as the nerve endings become overstimulated.
In a study published in Science Daily, scientists believe that nerve endings help baby primates determine which parts of the body are sensitive. The feet are used often and this highly developed sense of touch helps determine what is safe to walk on and what isn't.
Other extremely ticklish parts of the body include the back, armpits and chest, all of which have many nerve endings.
It is impossible to tickle ourselves. Also, only light contact causes tickling while heavy or direct touching does not.
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