Scientsists discover the secret of tickling yourself
8/4/2004
Experiments in which volunteers are tickled while waking from sleep are taking place at Swansea University.
Using a specially constructed tickling machine, Dr Mark Blagrove, a Reader in Psychology at the University and Director of the Swansea University Sleep Laboratory, is investigating the nature of rapid eye movement sleep and dreaming.
Dr Blagrove, who will present his work in the United States this week at a world conference on consciousness, has discovered that people can tickle themselves when woken from a dreaming state, but not when woken from non-dreaming sleep.
He will tell the Tucson Consciousness Conference at the University of Arizona that the volunteers experience self-tickling as though it were produced by someone else.
Dr Blagrove said: 'Everyone knows that you are more likely to feel ticklish if you are tickled by someone else than if you tickle yourself. However, if you are woken from REM sleep and tickle yourself if feels as intense as if you are being tickled by someone else.'
A device developed by the Institute of Neurology in London produces the tickling sensation on the palm of the hand.
Dr Blagrove added: 'People with schizophrenia can successfully tickle themselves because they produce hallucinations but think that what they see is real, coming from outside themselves, not actually produced by them. They experience self-tickling with the same intensity as if it were produced by someone else.'
As the other state in which people produce hallucinations and believe they are real is dreaming, Dr Blagrove wanted to find out whether the same psychophysiological effect could be produced when people are woken from REM sleep.
'By waking someone up and immediately using the device to tickle them, and also allowing them to tickle themselves, we found that people can tickle themselves when woken from REM sleep in which they are dreaming.'
'However, they had not been able to tickle themselves the previous evening, or in the morning, or if woken from sleep in which they were not dreaming.'
'Dreaming is therefore a bit like being able to tickle yourself when asleep. REM sleep allows you to believe that the events of the dream are real, that you are not producing them, and this characteristic of REM sleep carries over for a few minutes when you are awake and enables you to tickle yourself for a few minutes after waking up.'
[source:News Wales ]