Tickling, although it is perceived as unpleasant, performs a defensive function of the most vulnerable areas of the body. When the soles of our feet are brushed, our instinct is to laugh and struggle away from the potential dangers. The instinct to laugh and wiggle attests to the fact that tactile sensitivity is functioning properly; from this point of view, it is a sign of physical health.
"Healthy" goat tickle
In this film, a man practices goat torture on his friend, believed to be paralyzed, to show her that she actually still possesses leg sensitivity. The girl in fact begins to laugh at the tickling the animal causes her by licking her, and realizes that she can feel her extremities again.
Medical Exams
In this video, a woman can feel her foot after a surgery. A doctor tickles her feet and she starts to laugh, surprised by this new sensation.
Ticklefoot, a machine that evokes laughter
Tickling is a sensation that often leads to laughter or smiling and that can reduce stress.
Tickefoot is project aims to address to design and develope a new foot-tickling mechanism that can produce laughter. They created an actuator that uses magnet-driven brushes to produce tickling sensations on the sole of the foot. Its stimuli can indeed produce laughter.
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