Each hemisphere has very different attributes or functions. Where all the pro-active, logical, rational, planning thinking goes on. We often use self-suggestion in everyday life in the form of spontaneous thoughts or observations. We are also continually subjected to 'unconscious hypnotism' in our daily life by parents, teachers, peer pressure, politicians, etc. Newspaper and television advertising, for example, try to persuade us to do things e.g. buy a particular product.
Repetition reinforces the suggestion.
If you have ever found yourself at the checkout counter not knowing why you put something in the basket, this may be the reason. If we are unaware of these negative suggestions we may cause ourselves all manner of disabilities or ailments. Thankfully suggestion is a two edged sword. Those who are instructed in its use can relieve the symptoms or unwanted behaviour patterns which negative suggestion may have caused. Our subconscious mind often stubbornly prefers to cling on to known behaviours and symptoms even if they are negative and interfere with our peace of mind and quality of life.