The science of cuddling

The revelation came after doctors realised that a woman with no sense of touch still felt a "pleasant" sensation when her skin was caressed.

Normal touch is transmitted to the brain through a network of fast-conducting nerves, called myelinated fibres, which carry signals at 60 metres per second. But there is a second slow-conducting nerve network of unmyelinated fibres, called C-tactile (CT), the role of which was unknown. The CT network carries signals at just one metre per second.