A new word for an age-old phenomenon
In New Scientist for 13 May, I have come across a word I had never met before. It is “gelatology”, and we are told that it signifies the study of laughter.
Laughter has been defined as “an emotional response, expressive normally
of joy, in the child and the unsophisticated adult”. Irregular and often
involuntary expirations are associated with vibratory movements of the vocal
cords. Although laughter usually expresses amusement it may sometimes denote
hysteria.
The evolutionary origins of laughter have been traced to an early period before
humans evolved from apes. Our distant ancestors indulged in it between four and
two million years ago, but we are told they could not produce the traditional “ha,
ha, ha” but had to be content with staccato panting. Apes still make these
responses today. In the course of evolution facial expressions played their part,
and laughter became a voluntary as well as an involuntary activity.
It is thought that amusement and humour were originally not connected with the
notion of laughter. Social control and group communication were formerly the
objective. Laughing during normal conversation is commoner than laughing at deliberate
jokes. The ability to provoke a laugh or to do so at someone else is a way of
achieving a social dominance and women laugh more than do men.
Laughter, as we all know, is contagious, but apparently no one knows why. It
may be due to a feedback in the prefrontal cortex of the brain. Extreme episodes
have been reported of contagious laughter, notably in Tanzania in 1962, where
a group of schoolgirls started giggling. It spread to other groups in the adjacent
areas and altogether persisted for several months.
It seems evident that laughter is a potent influence in some social situations
and cannot be dismissed as socially insignificant. Indeed, in certain environments
it may prove exceedingly embarrassing for the people involved.
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