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Mind & Brain

6 free cognitive tests to help you know your own mind

A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?
Credit: Orlando Florin Rosu / Adobe Stock
Key Takeaways
  • There are many apps and intelligence quizzes online that promise to measure — or even boost — your cognitive abilities or reveal characteristics about your personality.
  • However, many such tests have little evidence showing that they do anything besides waste your time. 
  • Here are six tests commonly used in psychological research to measure personal traits and certain aspects of cognition.

Out of everybody on the planet, you spend the most time with yourself. That’s why the fact that we don’t really know that much about ourselves is so unfair. These six cognitive tests can help provide a bit more perspective on how your brain works, the shortcuts it takes, and its character in general.

The cognitive reflection test

This very short test measures an aspect of your mind known as cognitive reflection, or your ability to consider your own cognition. Take look at the following three questions and see what comes to mind.

  1. A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?
  2. If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?
  3. In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?

About one in three people provide the wrong answer to all three questions, while 83% provide at least one wrong answer. Essentially, this test measures people’s ability to resist making mental shortcuts. The questions themselves heavily encourage a particular answer, but a few moments of reflection reveal that the easy answers are red herrings. The correct answers can be found at the bottom of this page.

Interestingly, low scores on the cognitive reflection test correlate with an inability to see fake news headlines as fake.

The International Personality Item Pool

While measuring personality is a somewhat controversial subject among psychologists, some research has shown that the personality measures used in the International Personality Item Pool (IPIP) correlate to the likelihood of developing a mental disorder, academic achievement, and even how long one might live.

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The test measures five major characteristics: openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism. Take the test here. You’ll notice there’s both a short and a long version available; keep in mind that the long version, while more accurate, has 300 questions.

Many people are probably more familiar with the Myers-Briggs personality test, which places people in 16 different, opposing categories, such as thinking versus feeling personalities and judging versus perceiving personalities. The Myers-Briggs test, however, has been widely criticized due to its inability to consistently measure an individual’s personality, its lack of objectivity, and its validity. In fact, Katherine Briggs and Isabel Myers—the creators of the test—weren’t even trained psychologists.

The Wonderlic test

The Wonderlic Test—wonderfully named after its creator, Eldon F. Wonderlic—includes 50 questions designed to measure overall cognitive ability, or intelligence. Most are probably familiar with the Wechsler Adult Intelligence Scale (WAIS), which measures a tester’s intelligence quotient (IQ) and places the average at 100. The Wonderlic, in contrast, has an average score of 20.

The main difference between the Wonderlic and the WAIS tests, however, is that Wonderlic is used primarily as a method of vetting potential employees. The American Psychological Association has approved its use for personnel testing, and it is currently employed in many different sectors. Most notably, the Wonderlic is used in the NFL to assess the intelligence of draft picks. With any luck, you’ll outperform Jets cornerback Morris Claiborne, who scored a disastrous four. To put that in context, Wonderlic, Inc. claims a score of 10 is considered to be roughly equivalent to literacy. You may do better than Morris Claiborne, but it’ll be a challenge to outperform Tom Brady, who scored a 33, or Eli Manning, who scored a 39. Take a sample Wonderlic here.

The Iowa Gambling Task

First developed by Antoine Bechara, the Iowa Gambling Task was designed to mimic real-world decision-making and assess executive function—essentially, the set of cognitive processes that allows for the deliberate control of behavior. You can take the test here.

The Iowa Gambling Task is simple; the premise is that you’ve borrowed $2,000 for gambling. There are four decks you can draw from, each of which will sometimes produce a card that rewards you with money, penalizes you, or does a combination of the two. Each turn, you can choose from which deck you want to draw.

The trick of the test, however, is that two of the decks have greater penalties, while two of them have greater rewards. Most people switch to a “good” deck after a period of losses, but patients with damage to their prefrontal cortexes (where the bulk of the brains executive functioning transpires) fail to predict future consequences of the actions and play the same deck. Furthermore, chronic gamblers have been found to exhibit reduced responses to playing risky decks (i.e., playing bad decks that lead to losing all your money).

The Stroop test

Named after the American psychologist John Ridley Stroop, the Stroop test is a well-known measure of executive function. Like the Iowa Gambling Task, its premise is straightforward: A series of color words are presented to the test taker (i.e., “red,” “blue,” etc.), but the words themselves are printed in randomly colored ink. The task is to select the color of the word as fast as possible rather than selecting the word itself. So, if the word “red” were in blue ink, the test taker would answer “blue.”

It turns out this is a pretty difficult thing for us to do. There are a few different theories out there for why this happens, but the main one is that the brain processes linguistic information far faster than color information. Both the word and the color hit our eyeballs at the same time, but the word gets pulled into the decision-making process first. The brain has to inhibit this information in order to select the correct, color-based response. Interestingly, people with attention deficit hyperactivity disorder (ADHD) perform more poorly on this test, likely due to their reduced ability to inhibit their automatic responses.

Take the test here.

The Paced Auditory Serial Addition Task (PASAT)

This task measures the test taker’s capacity for information processing as well as the rate at which that occurs. While it was originally designed to assess the impact of a traumatic brain injury on the test taker’s cognitive functioning, the PASAT relies on working memory, attention, and arithmetic abilities and can be used to assess these qualities in any subject. Notably, scores on the PASAT decrease with age, indicating the effects of cognitive decline.

The PASAT is mainly used in patients with multiple sclerosis—in which nerve cells lose their insulating sheaths—as their ability to maintain the attention required for this test is severely impaired. You can take the PASAT here.

This article was originally published on Big Think in August 2018. It was updated in May 2022.