In the early 1960s, Dr. Maxwell Maltz was convinced that some of his patients were using hallucinations to relieve boredom and maintain an optimal level of arousal.
He believed this because he noticed that many people who have low levels of self-confidence are able to see themselves as successful after imagining a scenario where they are having success.
The following is an excerpt from his book Psycho-Cybernetics:
A New Way to Get More Living Out of Life, which describes how a person might begin using hallucination.
I have observed that many people who start as patients at the Psycho-Cybernetics Clinic are able to see themselves successful after imagining a situation in which they are having success.
For example, if a girl thinks about herself as being very attractive and popular with boys.
She may be able to create this imaginary picture vividly enough for it to seem real—and so experience the thrill of her own power over life’s lottery!
If she can do this every day or even once each week while believing firmly it will happen someday soon.