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The tickle can be divided into two separate categories of sensation, knismesis and gargalesis. This type of tickle, called a knismesis , generally does not produce laughter and is sometimes accompanied by an itching sensation. In , Yngve Zotterman of the Karolinska Institute studied the knismesis type of tickle in cats, by measuring the action potentials generated in the nerve fibres while lightly stroking the skin with a piece of cotton wool. This suggested that when a person tries to tickle himself or herself, the cerebellum sends to the somatosensory cortex precise information on the position of the tickling target and therefore what sensation to expect. Some evidence suggests that laughing associated with tickling is a nervous reaction that can be triggered; indeed, very ticklish people often start laughing before actually being tickled. Main article: Tickle torture. Gargalesis , on the other hand, produces an odd phenomenon: when a person touches "ticklish" parts on their own body no tickling sensation is experienced.

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Psychonomic Bulletin and Review. This is most likely largely due to the difficulty many people with the disorder have recognising their own actions. The psychology of tickling, laughing and the comic. But they differed on ticklish laughter: Darwin thought that the same light state of mind was required, whereas Bacon disagreed. Blakemore and colleagues have investigated how the brain distinguishes between sensations we create for ourselves and sensations others create for us.

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