L. Ron Hubbard discovered the single source of nightmares, unreasonable fears, upsets, insecurities and psychosomatic illnesses - the reactive mind. In his book "Dianetics: The Modern Science of Mental Health" he described the reactive mind in detail and laid out a simple, practical, easily taught technology to overcome it and reach the state of Clear (a state where the individual is free from the reactive mind). Dianetics is that technology.
L. Ron Hubbard wrote: “The source of aberration has been found to be a hitherto unsuspected sub-mind which, complete with its own recordings, underlies what Man understands to be his ‘conscious’ mind. The concept of the unconscious mind is replaced in Dianetics by the discovery that the ‘unconscious’ mind is the only mind which is always conscious. In Dianetics this sub-mind is called the reactive mind.”
The reactive mind does not store memories as we know them. It stores particular types of mental image pictures called engrams. An engram is a complete recording, down to the last accurate detail, of every perception present in a moment of partial or full “unconsciousness.”
“Unconsciousness” could be caused by the shock of an accident, anesthetic used for an operation, the pain of an injury or the delirium of illness. During these painful experiences, the analytical mind shuts down to protect itself from the overcharge of pain. This is when the reactive mind cuts in and records the entire incident, including every perception (taste, sound, sight, smell, etc.) present. An engram therefore exists below the individual’s awareness level yet can be activated so as to enforce its content and cause unevaluated, unknown and unwanted fears, emotions, pains, neuroses, psychoses and psychosomatic illnesses.
In Dianetics procedure (auditing), the individual recounts an incident of “unconsciousness” from beginning to end until the engram is reduced, which means all the charge or pain is erased from the incident. The individual is therefore free of the aberrative effect of the incident and can experience enormous relief and a rise in emotional tone. That incident will remain in the individual's memory, but will no longer have negative impact on their life.