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Reverse speech is a pseudoscientific topic first advocated by David John Oates which gained publicity when it was mentioned on Art Bell's nightly Coast to Coast AM radio talk show.

It is based upon the theory that during spoken language production, human speakers subconsciously produce hidden messages that give insights into their innermost thoughts. Oates claims that it therefore has applications in psychotherapy, criminology and business negotiation. The theory has been rejected by mainstream science and academia.