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What Can A Personality Test Tell Us About Who We Are?

Courtesy of Pottermore.com

In one of the most famous scenes from the Harry Potter series, a group of kids, new to the Hogwarts School of Witchcraft and Wizardry, line up before an old and crumpled wizard's hat. It is the sorting hat. The hat will tell them which house they'll belong to during their Hogwarts education.

There is something deeply appealing about the sorting hat. It is wise. It seems to know people better than they know themselves.

We humans love this kind of insight. And our drive to better understand ourselves and the people around us has led to the creation of a multi-billion dollar industry built around personality testing.

Probably the most famous of all personality tests is the Myers-Briggs Type Indicator, or MBTI. But there are plenty of others, too. These tests categorize people based on personality traits. Are you an introvert or an extrovert? Someone who likes unexpected challenges, or someone who prefers structure and calm? Many of America's most successful companies use personality tests to gain a better understanding of their workers. Many individuals use them to gain a better understanding of themselves.

One Hidden Brain listener, Ally Adler, took the Myers-Briggs test when she was 26 and miserable in her job.

"It really helped me understand myself in a way that I hadn't before so I could work around and manage challenges both in my personal and professional life," she says.

At the Potterverse convention in Baltimore, adults and children alike enjoy talking about their Harry Potter Hogwarts "houses" — and the houses they think their friends should be in.
Tara Boyle / NPR
At the Potterverse convention in Baltimore, adults and children alike enjoy talking about their Harry Potter Hogwarts "houses" — and the houses they think their friends should be in.

But other people say tests like these are deeply flawed. Listener Matthew Gale says the Myers-Briggs got him completely wrong.

"My experience with Myers-Briggs played no small part in ruining me emotionally for years," he says.

While the effectiveness of these tests can be endlessly debated, one thing is clear. With a few exceptions, most do not stand up to scientific scrutiny. They typically aren't peer reviewed and usually fail basic standards of validity and reliability. Adam Grant, a psychology and management professor at the University of Pennsylvania, has written of his concerns with the Myers-Briggs, particularly when companies use the results to guide hiring and firing decisions.

"It's a great way to weed out diversity," Grant says.

Allen Hammer, the former chair of the Myers & Briggs Foundation, disagrees. He believes the Myers-Briggs is as reliable as other personality tests. And he says Grant is wrong when it comes to evidence that the Myers-Briggs cannot predict real world outcomes; for example, he says, "when people matched roommates on their psychological type they got a 65 percent decrease in request for roommate changes."

This week, we delve into the world of personality tests, and discover new research that suggests the power of personality assessments may not be in pinpointing the person you are, but the person you have the potential to become.

Additional Resources:

"Can Superstition Create a Self-Fulfilling Prophecy? School Outcomes of Dragon Children of China," by Naci H. Mocan and Han Yu, 2017.

Hidden Brain is hosted by Shankar Vedantam and produced by Jennifer Schmidt, Parth Shah, Rhaina Cohen, Laura Kwerel, and Thomas Lu. Our supervising producer is Tara Boyle. You can also follow us on Twitter @hiddenbrain , and listen for Hidden Brain stories each week on your local public radio station.

Editor's note:In the original version of this story, interviewee Adam Grant mixed up the definitions of scientific reliability and validity. This error has been corrected in this version of the story.

According to the American Psychological Association, validity is defined as "the degree to which empirical evidence and theoretical rationales support the adequacy and appropriateness of conclusions drawn from some form of assessment." The APA defines reliability as "the trustworthiness or consistency of a measure, that is, the degree to which a test or other measurement instrument is free of random error, yielding the same results across multiple applications to the same sample."

Copyright 2020 NPR. To see more, visit https://www.npr.org.

Shankar Vedantam is the host and creator of Hidden Brain. The Hidden Brain podcast receives more than three million downloads per week. The Hidden Brain radio show is distributed by NPR and featured on nearly 400 public radio stations around the United States.
Jennifer Schmidt is a senior producer for Hidden Brain. She is responsible for crafting the complex stories that are told on the show. She researches, writes, gathers field tape, and develops story structures. Some highlights of her work on Hidden Brain include episodes about the causes of the #MeToo movement, how diversity drives creativity, and the complex psychology of addiction.
Parth Shah is a producer and reporter in the Programming department at NPR. He came to NPR in 2016 as a Kroc Fellow.
Tara Boyle is the supervising producer of NPR's Hidden Brain. In this role, Boyle oversees the production of both the Hidden Brain radio show and podcast, providing editorial guidance and support to host Shankar Vedantam and the shows' producers. Boyle also coordinates Shankar's Hidden Brain segments on Morning Edition and other NPR shows, and oversees collaborations with partners both internal and external to NPR. Previously, Boyle spent a decade at WAMU, the NPR station in Washington, D.C. She has reported for The Boston Globe, and began her career in public radio at WBUR in Boston.