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Cold reading is a set of techniques used by mentalists, psychics, fortune-tellers, and mediums. Without prior knowledge, a practiced cold-reader can quickly obtain a great deal of information by analyzing the person's body language, age, clothing or fashion, hairstyle, gender, sexual orientation, religion, ethnicity, level of education, manner of speech, place of origin, etc. during a line of questioning. Cold readings commonly employ high-probability guesses, quickly picking up on signals as to whether their guesses are in the right direction or not, then emphasizing and reinforcing chance connections and quickly moving on from missed guesses. Psychologists believe that this appears to work because of the Forer effect and due to confirmation biases within people.
Before starting the actual reading, the reader will typically try to elicit cooperation from the subject, saying something such as, "I often see images that are a bit unclear and which may sometimes mean more to you than to me; if you help, we can together uncover new things about you." One of the most crucial elements of a convincing cold reading is a subject eager to make connections or reinterpret vague statements in any way that will help the reader appear to make specific predictions or intuitions. While the reader will do most of the talking, it is the subject who provides the meaning.
After determining that the subject is cooperative, the reader will make a number of probing statements or questions, typically using variations of the methods noted below. The subject will then reveal further information with their replies (whether verbal or non-verbal) and the cold reader can continue from there, pursuing promising lines of inquiry and quickly abandoning or avoiding unproductive ones. In general, while revelations seem to come from the reader, most of the facts and statements come from the subject, which are then refined and restated by the reader so as to reinforce the idea that the reader got something correct.
Subtle cues such as changes in facial expression or body language can indicate whether a particular line of questioning is effective or not. Combining the techniques of cold reading with information obtained covertly (also called "hot reading") can leave a strong impression that the reader knows or has access to a great deal of information about the subject. Because the majority of time during a reading is spent dwelling on the "hits" the reader obtains, while the time spent recognizing "misses" is minimized, the effect gives an impression that the cold reader knows far more about the subject than an ordinary stranger could.
James Underdown from Center for Inquiry and Independent Investigations Group said, "In the context of a studio audience full of people, cold reading is not very impressive." Underdown explains cold reading from a mathematical viewpoint. A typical studio audience consists of approximately 200 people, divided up into three sections. A conservative estimate assumes each person knows 150 people. Underdown says:
This means that when John Edward or James Van Praagh asks the question "Who's Margaret?" he is hoping there is a Margaret in the 10,000 people in the database of that section. If there is no answer, they open the question up to the whole audience's database of over 30,000 people! Would it be surprising for there to be a dozen Margarets in such a large sample?
Mentalist Mark Edward relates from personal experience as a "psychic performer" how powerful a hit can be when someone in a large audience "claims" a phrase such as a "clown in a graveyard" statement. Edward describes a mental image of a clown placing flowers on graves and adds, "Does that mean anything to someone?" whereupon a woman stands up and claims that he is speaking directly to her. She remembers it as Edward specifically stating that she knew a man who dressed as a clown and placed flowers on graves in her hometown. Edward reports that it took some convincing to get her to understand that he was not directly talking to her, but had thrown the statement out to the entire audience of 300 people. She made the connection, and because it seemed so personal and the situation so odd she felt that he was talking to her directly.
"Shotgunning" is a commonly used cold reading technique. This technique is named after the manner in which a shotgun fires a cluster of small projectiles in the hope that one or more of them will strike the target.
The cold reader slowly offers a huge quantity of very general information, often to an entire audience (some of which is very likely to be correct, near correct or at the very least, provocative or evocative to someone present), observes their subjects' reactions (especially their body language), and then narrows the scope, acknowledging particular people or concepts and refining the original statements according to those reactions to promote an emotional response. A majority of people in a room will, at some point for example, have lost an older relative or known at least one person with a common name like "Mike" or "John".
Shotgunning might include a series of vague statements such as:
The Forer effect relies in part on the eagerness of people to fill in details and make connections between what is said and some aspect of their own lives, often searching their entire life's history to find some connection, or reinterpreting statements in a number of different possible ways so as to make it apply to themselves.
"Barnum statements", named after P. T. Barnum, the American showman, are statements that seem personal, yet apply to many people. And while seemingly specific, such statements are often open-ended or give the reader the maximum amount of "wiggle room" in a reading. They are designed to elicit identifying responses from people. The statements can then be developed into longer and more sophisticated paragraphs and seem to reveal great amounts of detail about a person. A talented and charismatic reader can sometimes even bully a subject into admitting a connection, demanding over and over that they acknowledge a particular statement as having some relevance and maintaining that they are just not thinking hard enough, or are repressing some important memory.
Statements of this type might include:
Regarding the last statement, if the subject is old enough, their father is quite likely to have died, and this statement would easily apply to a large number of medical conditions including heart disease, pneumonia, diabetes, emphysema, cirrhosis of the liver, kidney failure, most types of cancer, as well as any cause of death in which cardiac arrest precedes death, or damage to the brainstem responsible for cardiopulmonary function.
Warm reading is a performance tool used by professional mentalists and psychic scam artists. While hot reading is the use of foreknowledge and cold reading works on reacting to the subject's responses, warm reading refers to the judicious use of Barnum effect statements.
When these psychological tricks are used properly, the statements give the impression that the mentalist, or psychic scam artist, is intuitively perceptive and psychically gifted. In reality, the statements fit nearly all of humanity, regardless of gender, personal opinions, age, epoch, culture or nationality.
Michael Shermer gives the example of jewelry worn by those in mourning. Most people in this situation will be wearing or carrying an item of jewelry with some connection to the person they have lost, but if asked directly in the context of a psychic reading whether they have such an item, the client may be shocked and assume that the reader learned the information directly from the deceased loved one. Robert Todd Carroll notes in The Skeptic's Dictionary that some would consider this to be cold reading.
The rainbow ruse is a crafted statement which simultaneously awards the subject a specific personality trait, as well as the opposite of that trait. With such a phrase, a cold reader can "cover all possibilities" and appear to have made an accurate deduction in the mind of the subject, despite the fact that a rainbow ruse statement is vague and contradictory. This technique is used since personality traits are not quantifiable, and also because nearly everybody has experienced both sides of a particular emotion at some time in their lives.
Statements of this type include:
A cold reader can choose from a variety of personality traits, think of its opposite, and then bind the two together in a phrase, vaguely linked by factors such as mood, time, or potential.
The mentalist branch of the stage-magician community approves of "reading" as long as it is presented strictly as an artistic entertainment and one is not pretending to be psychic.
Some performers who use cold reading are honest about their use of the technique. Lynne Kelly, Kari Coleman, Ian Rowland, and Derren Brown have used these techniques at either private fortune-telling sessions or open forum "talking with the dead" sessions in the manner of those who claim to be genuine mediums. Only after receiving acclaim and applause from their audience do they reveal that they needed no psychic power for the performance, only a sound knowledge of psychology and cold reading.
In an episode of his Trick of the Mind series broadcast in March 2006, Derren Brown showed how easily people can be influenced through cold reading techniques by repeating Bertram Forer's famous demonstration of the personal validation fallacy, or Forer effect.
In a detailed review of four sittings conducted by medium Tyler Henry, Edward and Susan Gerbic reviewed all statements made by him on the TV show Hollywood Medium. In their opinion not one statement made by Henry was accurate, yet each sitter felt that their reading was highly successful. In interviews with each sitter after their sitting, all four claimed specific statements made by Henry, but, after reviewing the show, it was shown that he had not made those statements. Each sitter had misremembered what Henry said. One of many examples of this was when Henry, during a session with celebrity Ross Mathews, stated "Bambi, why am I connecting to Bambi?" Mathews stated that his father, who was a hunter, would not shoot deer because of the movie Bambi. In the post-interview, Mathews stated that "It was weird that Henry knew that my father would not shoot deer because of Bambi", demonstrating that Mathews did not remember that he, not Henry, had supplied the connection to Bambi.
Gerbic has pointed out the broader issue of the human brain attempting to make connections that then make it appear that the psychic was correct. She lists this among a number of techniques or situations that psychics take advantage of.
Former New Age practitioner Karla McLaren has spoken about developing a system of cold reading without realising, saying in a 2004 interview that "I didn't understand that I had long used a form of cold reading in my own work! I was never taught cold reading and I never intended to defraud anyone; I simply picked up the technique through cultural osmosis." McLaren has said that since she was always very perceptive, she could easily figure out many of the issues that people brought into sessions with them. In order to reduce the appearance of unusual expertise that might have created a power differential, she posed her observations as questions rather than facts. This attempt to be polite, she realized, actually invited the other person, as McLaren has said, to "lean into the reading" and give her more pertinent information.
After some people have performed hundreds of readings, their skills may improve to the point where they may start believing they can read minds. They may ask themselves if their success is because of psychology, intuition or a psychic ability. This point of thought is known by some skeptics of the paranormal as the "transcendental temptation". Magic historian and occult investigator Milbourne Christopher has warned that the transcendental choice may lead one unknowingly into a belief in the occult and a deterioration of reason.