Me, Myself, I



Here's a great article from the BBC which explains why you can't tickle yourself which if I read  things right, comes down to the fact that a person's brain is wired to distinguish immediately between different kinds of contact - and as tickling is a friendly form of play with someone else the necessary external stimulus cannot be replicated by 'going solo'.

Although interestingly people with schizophrenia can tickle themselves which reminded me of this post from the blog site archive about the former Rangers goalkeeper, Andy Goram.     


Why can’t you tickle yourself?


By David Robson - BBC


(Thinkstock)


It’s almost impossible to get a laugh by self-tickling, says David Robson, and the reason why tells us surprising things about the brain and consciousness.

Why do we laugh when we are being tickled and how can it be a relaxing experience?

If you want to probe some of the great mysteries of the human mind, all you need is a duster and your feet. Sit back, take your shoes and socks off, and gently stroke its feathers against your sole. Now ask a friend, parent or child to do the same for you. If you are like most people, you will be left stony-faced by one, but convulsed in a pleasurable agony by the other. How come?

and
While asleep, people tried to get dream characters to tickle them - that too failed — Even in dreams, the brain stops self-tickling

Once the domain of childhood curiosity, the question of why we can’t tickle ourselves is exciting neuroscientists. “It leads to these bigger questions of consciousness and self-awareness, who we are,” says George Van Doorn at Monash University in Australia. For this reason, they are now going to some – often extreme – lengths to overcome the brain’s barriers and to get people to tickle themselves in the lab.

To understand their interest, consider this: every time your body moves, it creates potentially confusing sensations that could lead you astray in all kinds of ways. Just imagine the chaos if you assumed that someone was fondling or attacking you, every time one of your hands brushed your leg, for example. Being able to differentiate between your movements, and the actions of other people, is therefore a central part of our sense of self and agency – aspects of the psyche that even the most sophisticated robots can’t replicate. And examining these kinds of traits, you want to find an example that is easily replicated in the lab. “Tickling is a nice example because the contrast between ticklish sensations produced by others and the inability to tickle oneself is so clear,” says Jennifer Windt at the Johannes Gutenberg University of Mainz in Germany.



(Thinkstock)

Sarah-Jayne Blakemore, at University College London, was one of the first to investigate the way the brain makes these lightning-fast decisions about the self and others. She scanned subjects’ brains as her colleagues tickled the palms of their hands, and when they attempted to do so themselves. From the resulting brain activity, she concluded that whenever we move our limbs, the brain’s cerebellum produces precise predictions of the body’s movements, and then sends a second shadow signal that damps down activity in the somatosensory cortex – where tactile feelings are processed. The result is that when we tickle ourselves, we don’t feel the sensations with the same intensity as if they had come from someone else, and so we remain calm rather than writhing with that familiar mix of discomfort and pleasure that comes when someone else tickles us.

If that was true, she suspected that there could be ways to fool the process, and allow people to tickle themselves. So she designed a machine that allowed her subjects to move a stick that gently stroked a piece of foam over their palm – sometimes instantaneously, at others with a delay of up to 200 milliseconds. It turned out that the greater the delay, the more ticklish the foam felt, perhaps because the cerebellum’s predictions no longer matched what the person was actually feeling.

Since Blakemore’s ground-breaking studies, many others have tried to find ways to find ways to trick the brain into tickling itself. Controlling someone’s foot movements with magnetic brain stimulation, so that their hand tickled their foot against their will, seems to do the trick. But it is one of the few experiments to succeed – others have produced puzzling results.

Van Doorn, for example, tried to give his subjects an out-of-body experience before tickling them. The set-up is relatively simple: the participant is fitted with video goggles that allow them to see from the eyes of the experimenter, who is sitting in front of them. By synchronising their movements, they slowly begin to feel like the experimenter’s body is their own. (For more information on how to swap your body with someone else, read our feature.)

In the midst of the illusion, the participants then had to move a lever that would tickle both bodies at the same time. With the subject confused about which body they were inhabiting, Van Doorn assumed that they would feel the full force of the tickle – but they were largely unmoved by the experience. “No matter if you swap bodies with someone else – you can’t tickle yourself with your own movements,” says Van Doorn.


You can't tickle yourself in dreams, nor if induced to have an out of body experience (Thinkstock)

You can’t even tickle yourself in your dreams. Windt recently performed a dream experiment that sounds like it came straight out of the movie Inception. She recruited a team of expert lucid dreamers – people who know they are dreaming, and can control the actions of their dreams – to try it out, but they couldn’t. The subjects also tried to get other dream characters to tickle them; that too failed, sometimes because the other characters simply refused to be of service. “Several of our subjects experienced problems with, let’s say, dream character compliance,” says Windt.

If all that seems a little esoteric, there could be practical reasons for picking apart the neural processes behind self-tickling. “It’s interesting that people with schizophrenia can tickle themselves and we think that’s associated with things like delusional and alien control of limbs,” says Van Doorn – perhaps because of a more general problem with identifying the origins of their movements. So attempts to break down that process in healthy people could, eventually, shed some light on the way it malfunctions during periods of mental illness.



Could robots one day be sentient enough to be ticklish? (Thinkstock)

Self-tickling could even improve artificial intelligence, says Robert Provine, at the University of Maryland, Baltimore. “Your inability to tickle yourself suggests neurologically based definitions of self and other,” he writes in a playful essay. “Developing a similar machine algorithm may lead to “ticklish” robots whose performance is enhanced by their capacity to distinguish touching from being touched, and, provocatively, may provide a computationally based construct of machine personhood.”

If so, a feather duster could provide a delightfully bizarre alternative to the famous Turing test for artificial intelligence in years to come: just aim for its extremities and see if it laughs.



Two Andy Gorams (30 October 2011)

    
I listened to a succession of seemingly intelligent football fans make fools of themselves yesterday.

As they sought to portray new measures to stamp out sectarianism in football - as an attack on their civil liberties.

'Who is going to decide what's offensive and what's not?' - they asked disingenuously - as if they had all just come up on the Clyde on a bicycle.

One chap even had the gall to suggest that if you don't like to be offended - then you shouldn't go to football matches - the implication being that such behaviour goes with the territory.

Spare me all the mental gymnastics and logic chopping - I couldn't disagree more.

Because the only thing that distinguishes football from other sports is the sheer size of the crowd - and the difficulty in policing such large numbers of people.

But that doesn't give people a licence to behave badly or cause real offence - in ways that would quickly get them arrested - if they behaved that way in the street.

Nor is it hard to tell the difference between football fans setting out to cause real offence - and just having a laugh at the 'other side's expense.

Football banter can be really funny - sectarian behaviour is not.

I imagine that even Andy Goram - who broke more Celtic hearts than most Rangers players down the years - could manage a wry smile at the Celtic fans who used to chant:

'Two Andy Gorams, there's only two Andy Gorams!'

After the Rangers and Scotland goalkeeper had been diagnosed - with a mild form of schizophrenia.

Not only was it genuinely funny - but Andy Goram had the last laugh most of the time.

And I'm sure he took the view that he who laughs last - laughs longest.   

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