At last, it's official. Hypnotism really does work - and it has an impact on the brain which can be measured scientifically, according to one of America's leading psychiatrists. David Spiegel, from Stanford University, told the prestigious American Association for the Advancement of Science that he had scanned the brains of volunteers who were told they were looking at coloured objects when, in fact, they were black and white. A scan showing areas of the brain used to register colour highligh...