Uzevši u obzir da ni svijest nije još uvijek dovoljno shvaćena niti definirana, onda je doista teško definirati i bilo koje promjene svijesti, uključujući i hipnozu.
However, one of the possible definitions would be that hypnosis has been altered, a unique state of consciousness, involving high levels of attention and reduced response to surrounding stimuli, and increased response to suggestions (hypnotists). Though not well researched, hypnosis has begun to be used in 1950s in medicine for pain relief, while its use today has spread to anxiety, depression, irritable bowel syndrome and eating disorders.
People are often divided into two groups: those who are very hypnotized and those who are hypnotized to hypnosis. As perhaps most known, there are people who can not be hypnotized. Why is that so? Research has shown that people who are easy to hypnotize have a slightly different structure of brain structures. Namely, the first group, as compared to a group that is difficult or impossible to hypnotize, has a larger rostrum (part of the brain in charge of attention and concentration). It also suggests that representatives of easily hypnotic groups have better attention and concentration, and that they can easily ignore or totally inhibit external stimuli. This group also includes children up to 12 years of age. One of the best hypnotherapists ever thought to be, Milton Erickson, was to hit an emergency at a hospital, should have a wound on the head of a boy. He gradually explained to the boy how to wound the wound, to the slightest detail, using the appropriate gesture and movements that imitate sewing. The boy suddenly became impatient and asked him when he would start sewing. Erickson replied, “I’ve already finished.”
During hypnosis, it has been shown that certain parts of the brain exhibit reduced, relatively increased activity, which causes people to have less control over memory, learning, and movements, diminishes control and awareness of the actions a person performs, and increases the awareness of what is absorbed in the body .
Hypnosis still remains a controversial subject. Although there is already some scientific evidence of its effectiveness, much work is still needed to find out all the details and get a complete picture, not just hypnosis but also about our brain as one of the greatest mysteries.