In 1897, psychologists [http://en.wikipedia.org/wiki/G._Stanley_Hall G. Stanley Hall] and Arthur Allin described a "tickle" as two [[different]] types of [[phenomena]]. One type is caused by very light movement across the skin. This type of tickle, called a [http://en.wikipedia.org/wiki/Knismesis_and_gargalesis knismesis], generally does not produce [[laughter]] and is sometimes accompanied by an itching sensation. The question as to why a person could not tickle him/herself was raised by the Greek philosopher, [http://en.wikipedia.org/wiki/Aristotle Aristotle]. | In 1897, psychologists [http://en.wikipedia.org/wiki/G._Stanley_Hall G. Stanley Hall] and Arthur Allin described a "tickle" as two [[different]] types of [[phenomena]]. One type is caused by very light movement across the skin. This type of tickle, called a [http://en.wikipedia.org/wiki/Knismesis_and_gargalesis knismesis], generally does not produce [[laughter]] and is sometimes accompanied by an itching sensation. The question as to why a person could not tickle him/herself was raised by the Greek philosopher, [http://en.wikipedia.org/wiki/Aristotle Aristotle]. |