Tickling makes children and adults laugh, but does not always provoke the same reactions. Some people would be more sensitive to it, while the responsiveness in others could depend on the moment. Explanations.
To be tickled for some it is funny, for others it is a most unpleasant feeling. For doctors, sensitivity to tickling remains a mystery. An article by Medical News Today provides some answers.
Knimesis or gargalesis
There are two types of tickling. Knimesis is a mild irritation of the skin, like when an insect lands on the skin. You can tickle yourself that way. The gargalesis is much more intense and causes giggles. Several studies show that tickling sensitivity is a form of reflex. Researchers have studied the brain reactions of individuals during a tickling session. This creates activity in the region of the brain that is linked to defensive behavior, the hypothalamus. The body’s reaction to tickling would therefore not be voluntary, someone who laughs for example, would not laugh because he appreciates but on the contrary, by reflex of protection.
Variations in sensitivity
Often, surprise increases people’s sensitivity to tickling. Those who are ticklish and are aware of it will also tend to react more. On the other hand, when a person is sad or angry, they will generally be less ticklish. Researchers fail to understand why some people are more ticklish than others, or only on certain parts of their body. Some may indeed be sensitive to tickling on the feet, but not under the arms.
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