A team... have identified a class of nerve fibres in the skin which specifically send pleasure messages. And people had to be stroked at a certain speed - 4-5cm per second - to activate the pleasure sensation...
They identified "C-tactile" nerve fibres as those stimulated when people said a touch had been pleasant. If the stroke was faster or slower than the optimum speed, the touch was not pleasurable and the nerve fibres were not activated...
He said the speed at which people found arm-stroking pleasurable was the same as that which a mother uses to comfort a baby, or couples use to show affection.
Professor McGlone said it was part of the evolutionary mechanism that sustained relationships between adults, or with children.
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