I Can Read You Like A Book

Why a stranger can seem to know you eerily well

Although we have never met, I’m confident I can accurately tap into and describe aspects of your personality. How? Because you can actually tell a great deal about someone by the things they choose to read. So, the fact that you’ve made a conscious decision to read my psychology Substack posts (thank you, by the way) tells me, in all probability, that:

You pride yourself on being an independent thinker and do not accept others’ statements without satisfactory proof.

You have a great deal of unused capacity which you haven’t fully turned to your advantage.

You prefer a certain amount of change and variety, becoming dissatisfied when restricted by limitations.

You have a strong need for others to like and admire you.

You tend to be critical of yourself.

While you have some personality weaknesses, you are generally able to compensate for them.

Disciplined and self-controlled on the outside, you tend to worry and feel insecure on the inside.

At times, you have serious doubts about whether you made the right decision or did the right thing.

You’ve found it unwise to be too open in revealing yourself to others.

Sometimes you are extroverted, sociable, and affable, while at other times, you are introverted, wary, and reserved.

Some of your aspirations tend to be unrealistic.

Security is one of your major life goals.

So, how did I do?

On a scale from zero (poor) to five (perfect), how would you rate the extent to which this description reveals basic characteristics of your personality? In most cases, this personality sketch consistently receives ratings of 4 or 5, which is quite impressive.

Or at least it would be, except for the fact that my analysis has absolutely nothing to do with what you read.

This is simply a demonstration of how people can be misled by general personality descriptions. This human susceptibility to interpret broadly applicable statements as uniquely meaningful is often referred to as the Barnum Effect, named after the American showman P.T. Barnum’s famous remark that “we’ve got something for everyone.” It’s also known as the Forer Effect, after Bertram R. Forer’s 1949 classic research paper titled The Fallacy of Personal Validation: A Classroom Demonstration of Gullibility.

The story behind forer’s research

One of my favorite aspects of Forer’s study is how it came to be. If Forer hadn’t been out clubbing (1940s style!), he might never have conducted his landmark research. Here’s how Forer himself explained it:

Recently, I was accosted by a nightclub graphologist who wished to 'read' my handwriting. An amiable discussion ensued, during which the graphologist offered proof of the scientific basis of his work, claiming that his clients affirmed the correctness of his interpretations. I suggested that a psychologist could make a blindfold reading and attain the same degree of verification.

Forer’s point was simple: his “clients” weren’t affirming the graphologist’s skill because handwriting analysis revealed their personality, but because the “analysis” consisted of universally valid descriptions. People tend to believe such general descriptions are uniquely accurate, even when they apply broadly.

As Forer noted:

A naïve person who receives superficial diagnostic information, especially when the social situation is prestige-laden, tends to accept such information. They are impressed by the obvious truths and may be oblivious to the discrepancies. But they do more than this. They also validate the instrument and the diagnostician.

Forer’s brilliant experiment

To support this claim, Forer conducted a simple but brilliant experiment with his Introductory Psychology class. Here’s how it went:

He handed out a “Diagnostic Interest Blank” (DIB), which contained hobbies, personal characteristics, job duties, and secret hopes. A week later, he gave each student a personalized personality sketch, supposedly based on their DIB responses.

What the students didn't know was that all the sketches were identical!

The personality sketch consisted of 13 statements, many taken from a newsstand astrology book, including some of the ones I used at the start of this post.

Forer asked his students to rate how accurate the DIB was in describing their personality. The result? Nearly all of them rated the sketch highly, not realizing that everyone had received the same one. When Forer revealed this, the class burst into laughter, providing a memorable lesson in how easy it is to be misled by vague, general statements.

We are just as gullible today

Forer’s findings have been supported on numerous occasions since 1949, with an excellent example provided by psychological illusionist Derren Brown in his TV series Trick of the Mind. In a perfectly executed demonstration of the Forer effect, Derren Brown took a group of volunteers in London, Los Angeles, and Barcelona, and asked them to draw around their hand on a piece of paper. On this same piece of paper, the volunteers were instructed to write down their birth date and time of birth (if known). They were then asked to take a personal object (but nothing immediately recognizable as theirs) and place it in an envelope along with their hand drawing and birth information. Having done this, Derren Brown informed the volunteers that he would now be able to provide each of them with a detailed personality profile.

The results

To say the volunteers were impressed is an understatement. Here are just a few of the comments made:

London Volunteers
“It’s unbelievable; I can’t believe how accurate it is.”
“I can’t believe he’s analyzing me so accurately.”
“It feels so personal that it’s actually quite difficult for me to share.”

Los Angeles Volunteers
“I feel it pretty much summed up the way I am.”
“It’s kinda astounding, I’ve always believed in something like this. This just kinda confirms it, but it also shocks me because I didn’t think it would work so well.”
“It was shockingly accurate.”

Barcelona Volunteers
“It goes into very profound things about my personality.”
“75% was so accurate and so personal.”
“There are things that are nailed perfectly.”

Time to come clean

Ever the consummate showman, Derren Brown then announced that he would like to try something else. He asked the volunteers to fold up their personality profiles and pass them around the group so that nobody knew which profile they had ended up with. The volunteers were then asked to read the profile and see if they could identify who it belonged to. At first, the volunteers thought they had ended up with their own profile by chance. However, it soon dawned on them that they had all been given exactly the same personality profile!

Why is this important?

At the very least, the Forer effect should encourage you to think more critically about astrology, fortune-telling, graphology, and psychic powers. Consider what some of the volunteers said after Derren Brown revealed the truth:

“Had we not reached this second part, I would have walked away from here thinking you had psychic abilities.”

“I won’t feel shivers and I will not be afraid of card readers anymore because I know it’s a lie... They are tricking me, and it costs a lot, and it’s a big industry, isn’t it?”

Try it yourself

Following Bertram Forer’s original study, many of the students involved asked for a copy of the personality sketch to try it out on their friends. Want to test the Forer effect with a group of your own friends or family? If so, all you need is:

A (fictitious) way to obtain a personality reading. Forer used a made-up diagnostic questionnaire, Derren Brown used hand drawings and birth date information, and I used the type of things people read.

A personality profile. Remember, the profile must be exactly the same for each person. You could use these 12 statements from Forer’s original paper:

• You have a great need for other people to like and admire you.

• You have a tendency to be critical of yourself.

• You have a great deal of unused capacity which you have not turned to your advantage.

• While you have some personality weaknesses, you are generally able to compensate for them.

• Disciplined and self-controlled outside, you tend to be worrisome and insecure inside.

• At times you have serious doubts as to whether you have made the right decision or done the right thing.

• You prefer a certain amount of change and variety and become dissatisfied when hemmed in by restrictions and limitations.

• You pride yourself as an independent thinker and do not accept others’ statements without satisfactory proof.

• You have found it unwise to be too frank in revealing yourself to others.

• At times you are extroverted, affable, sociable, while at other times you are introverted, wary, reserved.

• Some of your aspirations tend to be pretty unrealistic.

• Security is one of your major goals in life.

Or come up with your own. If you decide to construct your own one-profile-fits-all personality sketch but aren't sure whether to include a particular statement, just ask yourself: "Would this statement apply to most people?" If the answer is yes, then you are good to go. For example: "You have a tendency to worry but not to excess." "You do get unhappy at times, but on the whole, you are generally cheerful and rather optimistic."

You will also need:

An accuracy rating. Make sure you ask people to rate the extent to which they felt you had accurately read their personality, for example a percentage score out of 100.

An informed explanation. Finally, don’t forget to tell each person that their personality reading was just a smoke screen and that the real purpose behind the exercise was to demonstrate the Forer effect, that people tend to interpret broadly applicable statements as uniquely meaningful to them.

Note: For maximum impact, tell your friends or family that the personality reading is being conducted by someone you know but they don’t.

Update:

If you'd like to experience the Forer effect as an interactive online activity, Michael Britt of The Psych Files has created a brilliant classroom-ready version inspired by this article. It's a great resource for psychology teachers and students alike, and a fun way to test the Forer effect on your own family and friends. You can find it via the following link.

https://www.thepsychfiles.online/2026/04/07/personality-scale/

Final thoughts

So, it turns out that those opening statements had nothing to do with reading you like a book. Whether or not they felt personally accurate, the research is clear: most people believe they do. And that says something genuinely fascinating about the way our minds work. If you give the Forer effect experiment a go, I’d love to know the results.

---

Grow your Substack with All About Psychology

If you write about psychology, mental health, or human behavior on Substack, this is a rare opportunity to get your work in front of one of the largest, most established and engaged psychology audiences online.

I’m opening up a limited number of featured writer guest article slots, giving Substack writers direct access to my All About Psychology platform and audience for just $295.

Your guest article will be published on All-About-Psychology.com, a high-traffic website generating over 300,000 weekly search impressions, and promoted across the All About Psychology platform. It will be:

• Shared with my 200,000+ member LinkedIn psychology community, including direct inbox delivery

• Distributed across All About Psychology social media channels with a combined audience of 1M+ followers

You also get two highly valued backlinks, one to your Substack and one to a destination of your choice, whether that’s a personal website, social media channel, or elsewhere online. Search engines like Google view these links as a vote of confidence in the quality and relevance of your work, helping to increase the credibility, trustworthiness and visibility of your online presence.

Find out more and apply here.

---

About the author

David Webb is a psychology educator and author who has spent over twenty-five years helping people make sense of why we think, feel, and behave the way we do. He runs All About Psychology, a long-running hub of articles, interviews, and resources visited by over a million people each year.

His books, including Why We Are The Way We Are, are written for curious readers interested in what makes us tick.

You can explore more of his work and books on his Amazon author page.

---

Keep learning with All About Psychology

The All About Psychology Substack is your go-to source for all things psychology. Subscribe today and instantly receive my bestselling Psychology Student Guide right in your inbox.

Upgrade to a paid subscription and as an extra thank you, you’ll also get the eBook version of my book Psychology Q & A: Great Answers to Fascinating Psychology Questions.

Why Upgrade to Paid?

Every penny of paid subscriber support goes directly towards hosting and running costs, helping keep All-About-Psychology.com free for everyone.

Your support ensures that:

• Students and educators can continue to access the most important and influential journal articles in the history of psychology, completely free.

• Readers everywhere can hear directly from world-renowned psychologists, authors and leading experts in the field.

• High-quality free content for students, educators, and the general public continues to be created and shared on a regular basis.