The scientists also discovered that the C-tactile nerve fibres are only present on hairy skin, and are not found on the hand.
Professor
Francis McGlone, now based at Unilever after an academic career where
he carried out research into nerve response, says this is likely to be
a deliberate "design".
"We believe this could be Mother
Nature's way of ensuring that mixed messages are not sent to the brain
when it is in use as a functional tool."
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.
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