Entering an altered state of consciousness is nothing more than a process of restriction and intensification of focus. Increased internal focus of our attention, which involves a progressive restriction of attention to our environment, is correlated with the appearance of low frequencies in the electroencephalogram brain. Altered states of consciousness are not unusual. Many of us enter them without realizing it: when we are reading a book or watching a movie so concentrated that we hear the voices around us, or traffic noise, or even works on the street. Sometimes this also happens while driving on a freeway, when we look at the clock it has spent more time than we imagined, simply because we were completely absorbed in our thoughts. In regression therapy use that brainpower internal concentration to recover the file from our subconscious memories of our childhood, adolescence, birth, prenatal life, past lives or even their lives suspended between death and birth. Everyone has a "file system" subconscious, where permanently store everything that once seen, heard, or felt.
However, through various techniques is possible to enter the "file system" and relive the experience as it occurred at the time to understand our reactions and current behaviors. This therapy has the same efficiency whether you believe in reincarnation and if we think the facts are revived product of the imagination of our subconscious. Such fantasies reveal important information that we have created and therefore entirely valid for therapeutic work as the only truth is the truth that exists within the mind of that person.