The Oddly Accurate 60-Second Lemon Trick That Tells If You're An Introvert Or Extrovert

With a single lemon, find out whether or not you're naturally outgoing or quiet to your core.

Last updated on Jul 30, 2025

Extroverted woman with a lemon. Emma Rahmani | Canva
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Personality tests are always in style and are almost more compelling than reading your daily horoscope. But do you know about the ultimate personality test? You can't do this one online; instead, you've got to do it in real life.

Known as the lemon drop test, it requires a trip to the grocery store, but it's worth it.

No, this is not a test to see if you have a "sour" disposition. (I love puns, but will acknowledge that a line must be drawn somewhere.) 

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Rather, the lemon personality test determines your personality traits and whether or not you are an introvert or an extrovert, all by measuring your spit.

Woman chooses lemons BearFotos via Shutterstock

That's right, your saliva can tell you things you've never known about yourself! Crazy, right? The science works like this: There's a part of your brain called the Reticular Activating System, or RAS for short.  It's stimulated by social contact and by the introduction of food to our mouths.

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RELATED: People Who Are Ambiverts (Half-Extrovert, Half-Introvert) Usually Display These 6 Subtle Behaviors

Scientists have come to believe that introverts have more activity in the RAS. This means that introverts produce more saliva than extroverts when confronted with a stimulus.

The study, performed by Hans Eysenck and published in 1967, actually found evidence that this test works. In his study, Eysenck found that introverts salivated more in response to the lemon juice than those who were identified as extroverts. This led him to create his PEN model, which holds the idea that personality traits are of a biological basis.

Eysenck demonstrates that introverted subjects react more strongly with salivation to stimulation of the taste buds with pure lemon juice. 

As a personality measure, this test has many obvious advantages; it is objective, quick, and easy to perform, and has low visibility, in the sense that few subjects would guess the purpose of the procedure."

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What you'll need for the lemon drop personality test:

  • 1 fresh lemon
  • Cotton wool swabs
  • Kitchen weighing scales

RELATED: 5 Thoughtful Phrases Introverts Use That Set Them Apart, According To Experts

To take the lemon personality test, follow the instructions below:

  1. Drop a large taste of lemon juice on your tongue and swirl it around for ten seconds.
  2. Use cotton balls to swab up all of the saliva you have produced.
  3. Weigh the cotton balls.
  4. Now, ask a friend to join you in this exercise.
  5. Weigh their cotton balls.

Extroverts produce 50% less saliva than introverts. Those numbers are hard to ignore.

It's funny that the brain's way of communicating that you are an individual who needs time alone to recharge and restore is by producing a ton of saliva, but there you go.

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Maybe it was an early defense mechanism for introverts. They would be forced to go to a party they didn't want to go to, and when they were cornered, they could just spit out a massive amount of saliva and then flee. (That seems unlikely, but it's fun to think about all the same.)

I tried the lemon experiment myself and confirmed that I am one heck of an introvert, and my cotton ball is still covered in saliva to prove it. I wonder if I'll now react that way when presented with social obligations as well. We'll have to wait and see.

RELATED: The Image You’re Most Drawn To In This Visual Personality Test Reveals A Lot About The Type Of Person You Are At Your Core

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Rebecca Jane Stokes is a writer and the former Senior Editor of Pop Culture at Newsweek with a passion for lifestyle, geek news, and true crime.

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