History of mentalism: from ancient oracles to the debunking of fraudulent mediums

In 1948, Dr. Jules Dhotel took the stage to give a rather unusual lecture: to expose, one by one, the most famous mediums of his time before an audience of curious onlookers. A former president of the French Magicians' Association, he revealed that out of dozens of mediums who had been seriously investigated over the course of a century, not a single one had escaped proof of fraud. This lecture, rediscovered and published since in our archives, summarizes in itself a good part of the history of mentalism: a discipline born at the crossroads of entertainment, spiritualist fraud, and the fight waged by magicians themselves against false promises of real powers.

Mentalism as we know it today draws from several very distinct sources: ancient divination practices, the spiritualist movement launched in 1848 by the Fox sisters in the United States, muscle reading techniques developed by performers such as Stuart Cumberland, and the work of exposing fraud carried out for over a century by magicians confronted with fraudulent mediums. It is from this permanent tension between the claim of real power and acknowledged artifice that contemporary stage mentalism eventually emerged.

Before mentalism: a 3,000-year-old Egyptian papyrus

The techniques that prefigure mentalism are much older than we might imagine. In his lecture, Jules Dhotel mentions an Egyptian papyrus in hieratic script, translated in 1880 by the Egyptologist François Chabas, which already describes, with unsettling precision, methods very close to what would much later be called hypnotism, nearly 3,000 years before our era. Ancient oracles, pythiae, and other diviners already operated on mechanisms of suggestion and careful observation of the consultant that are found, in a theatrical form, among today's mentalists.

1848: the Fox sisters and the birth of modern spiritualism

The true birth certificate of modern spiritualism, widely recognized by historians, dates to December 1847 in the state of New York. The young Fox sisters heard unexplained rapping in their room and concluded that a spirit was trying to communicate with them. The affair spread quickly, first in the United States and then in England, Germany, Italy, and France, giving birth to an entire movement of séances, spirit tables, and professional mediums.

The Fox sisters themselves would confess years later that they had invented their "rappings" using a simple joint-cracking technique. But the confession was not enough to stop the movement they had launched: spiritualism would count followers until the mid-20th century, including among renowned scientists.

Cumberlandism: the ancestor of cold reading

The term "Cumberlandism," derived from the name of the performer Stuart Cumberland, refers to a simple but fundamental principle in the history of mentalism: every thought of action causes the beginning of a physical execution, however slight. A trained observer can then guess the object of a spectator's attention by detecting these involuntary micro-movements, particularly by holding their hand or seemingly guiding it.

This technique, exploited by both stage performers and fake mediums, is directly at the origin of what is known today as muscle reading or contact mentalism. Jules Dhotel devotes a large part of his lecture to it, emphasizing that these unconscious movements are "much more sensitive than one might imagine" for those who know how to observe them.

• Cumberlandism: guessing an action through the involuntary micro-movements of the subject
• The planchette and the inverted glass: the same micro-movements applied to automatic writing
• Suggestion: influencing through authoritative affirmation, without abolishing the subject's free will

Magicians against fake mediums

What truly distinguishes the history of mentalism is the role played by magicians themselves in exposing spiritualist frauds. As early as the end of the 19th century, performers such as Professor Dicksonn or, later, the lawyer and magician Maurice Garon actively participated in control commissions tasked with verifying the claims of the most famous mediums.

One of the most amusing episodes in this history concerns the Hungarian medium Willy Schneider, investigated in 1932 with scientific instruments believed to be infallible. Shortly after the experiment, Schneider himself revealed the fraud to his colleagues at the French Magicians' Association: he actually belonged to the Circle of Viennese Magicians and had simply wanted to test his own skill against scientists convinced of their own rigor. The famous "report of the 34," often brandished by spiritualists as scientific proof, was also reduced to nothing by a counter-report demonstrating that the medium Jean Guzik was simply moving objects with his foot once his leg was freed from the observers' control.

This tension between the claim of real power and acknowledged artifice also runs through the entire history of magic. Our article on Jules de Rovère becoming a magnetizer tells how, conversely, a famous magician himself could fall on the side of healing claims.

From parlor spiritualism to contemporary stage mentalism

Throughout the 20th century, as spiritualism lost ground to science, the techniques developed to simulate psychic powers (cold reading, Cumberlandism, suggestion) gradually migrated toward a framework acknowledged as entertainment rather than scientific claim. It is this shift that gives birth to modern mentalism as we know it, an art that borrows from psychology, manipulation, and staging, without ever claiming real supernatural power.

Our article on what hypnosis is extends this history toward suggestion, while our overview of contemporary French mentalists shows how this heritage continues today on stages and television. The divination objects themselves have their own history, as told in our article on the history of the crystal ball.

What this history changes for a mentalist today

Understanding this genealogy is not a mere exercise in erudition. It reminds us that a good part of the fundamental techniques of mentalism (cold reading, Cumberlandism, management of suggestion) were refined for decades in a context where the stake was precisely to distinguish acknowledged artifice from fraudulent claim. It is this distinction, inherited directly from the battles waged by generations of magicians against fake mediums, that still structures the ethics of stage mentalism today.

Frequently asked questions about the history of mentalism

Is mentalism directly derived from spiritualism?

Not directly, but the two share a common technical history. A large part of the methods used by mentalists (cold reading, Cumberlandism, suggestion) were developed or popularized in reaction to the practices of spiritualist mediums in the 19th and early 20th centuries.

What exactly is Cumberlandism?

It is a muscle reading technique based on the principle that every thought of action causes an involuntary beginning of physical execution, which a trained observer can detect to guess the object of a subject's attention.

Were all mediums of the 19th and 20th centuries frauds?

According to the control commissions carried out by scientists and competent magicians between the end of the 19th century and the mid-20th century, all mediums who were seriously investigated were proven to be fraudulent, without exception documented.

Why were magicians so involved in exposing mediums?

Because they recognized in the mediums' methods their own techniques of artifice, misappropriated to claim real power rather than acknowledged as entertainment, a confusion they considered both dishonest toward the public and harmful to their own art.