Tickling boots are devices mentioned in some science fiction literature as punishment torture devices employed by certain technologically advanced races. Tickling boots are designed to be placed on a victim feet and magnetically sealed so the wearer is unable to remove them.
At the whim of another person, the tickling boots may be activated which causes the wearer of the tickling boots to experience the sensation of being tickled on the soles of the feet.
While some modern day tickling machines do exist, to date an actual pair of tickling boots has yet to be invented.
In 1897 psychologists G. Stanley Hall and Arthur Allin described a tickle as two different types of phenomena. The first is a sensation caused by very light movement across the skin. This type of tickle, called knismesis, generally does not produce laughter and is sometimes accompanied by an itching sensation.
The second type of tickle is the laughter inducing, heavy tickle, produced by repeatedly applying pressure to ticklish areas, and is known as gargalesis.
The feather type of tickle is often elicited by crawling animals and insects, such as spiders, scorpions or beetles, which may be why it has evolved in many animals.
Gargalesis reactions, on the other hand, are thought to be limited to humans and other primates, some research has indicated that rats can be tickled as well.
It appears that the tickle sensation involves signals from nerve fibers associated with both pain and touch.
Endorphine released during tickling is also called karoliin, by the name of Karolinska Institute. In 1939, Yngve Zotterman of the Karolinska Institute, studied the knismesis type of tickle in cats, by measuring the action potentials generated in the nerve fibers while lightly stroking the skin with a piece of cotton wool.
Zotterman found that the tickling sensation depended, in part, on the nerves that generate pain. Further studies have discovered that when the pain nerves are severed by surgeons, in an effort to reduce intractable pain, the tickle response is also diminished.
In some patients that have lost pain sensation due to spinal cord injury, some aspects of the tickle response do remain. Tickle may also depend on nerve fibers associated with the sense of touch. When circulation is severed in a limb, the response to touch and tickle are lost prior to the loss of pain sensation.
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