Reactive Mind

The reactive mind is a concept in the Dianetics and Scientology systems of L. Ron Hubbard, referring to that portion of the human mind that is unconscious and stimulus-response, which Hubbard blamed for most mental and physical ailments. These ailments are regarded by Scientologists as psychosomatic ones:

"What can it do? It can give a man arthritis, bursitis, asthma, allergies, sinusitis, coronary trouble, high blood pressure and so on, down the whole catalog of psychosomatic ills, adding a few more which were never specifically classified as psychosomatic, such as the common cold." - L. Ron Hubbard (Dianetics: The Modern Science of Mental Health, 1999 paperback edition, pg.69)

Despite the lack of scientific basis for his claims, Hubbard's book Dianetics: The Modern Science of Mental Health claimed that the Reactive Mind stores impressions (which he called engrams) of past events, which occurred while the person was unconscious or otherwise not completely aware.

Scientology and Dianetics use a galvanic skin response detector called an E-meter originally designed by Volney Mathison that is basically a Wheatstone bridge designed to help the work of erasing one's own "engrams" According to Dianetics, erasing one's own reactive mind altogether can be facilitated by measuring the changes in resistance experienced by a living organism. Scientology promotes such treatments as a means of "spiritual rehabilitation" called auditing.