Laughter is an instinctive, contagious,
stereotyped, unconsciously controlled, social play vocalization that is unusual
in solitary settings. Laughter punctuates speech and is not typically humor
related, speakers often laugh more often than their audience, and male speakers
are the best laugh getters. Laughter evolved from the labored breathing of
physical play, with the characteristic “pant-pant” laugh of chimpanzees and
derivative “ha-ha” of humans signaling (“ritualizing”) its rowdy origin.
Laughter reveals that breath control is why humans can speak and chimpanzees
cannot. The evolution of bipedality in human ancestors freed the thorax of its
support role in quadrupedal locomotion, a critical step in uncoupling breathing
from running, providing humans with the flexible breath control necessary for
speech and our characteristic laugh. Tickle, an ancient laughter stimulus, is a
means of communication between preverbal infants and mothers, and between
friends, family, and lovers. Because you cannot tickle yourself, tickle
involves a neurological self/nonself discrimination, providing the most
primitive social scenario.
Tickling is often
fun for the tickler (the person doing the tickling) and can easily be fun for
the ticklee too (the person being tickled). It revolves around touch, which is
another reason we feel better after we're tickled. Tickling can be a great (and
possibly regular) bonding experience between friends, lovers, family members
etc.
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