How does hypnosis work?

Without a doubt. A study conducted by David Spiegel of Stanford University, through using a brain scan, it was demonstrated that through hypnosis people could be induced to see colours where there were none, in a black and white object. The scan showed an increase in blood supply to areas of the brain used to register colour. As trivial as this exercise may seem,  it’s a simple scientific proof that this powerful phenomenon is objectively measurable and real.