NewScientist.com reports on Neuropsychologist Halligan's research on hypnosis:

“Oakley [another researcher who works with Halligan] and Halligan are convinced their virtual patients are experiencing some of the same brain changes as people with genuine disorders. Halligan tells how they once induced a case of visual neglect in a volunteer by suggesting that the left side of his visual field would cease to exist. They then asked him to copy a picture with a dozen objects scattered on the page. Most hypnotized people given this instruction would copy only the objects on the right hand side of the page, as most people with visual neglect do. But this volunteer drew the right-hand side of every object on the page. ‘That’s not something you would intuitively expect,’ says Halligan, ‘but it is also seen in real patients.’”