7 surprising, science-backed signs of intelligence

Have you ever wondered if someone is highly intelligent without flashing a diploma in your face or solving complex equations on the fly?

Sometimes, intelligence reveals itself in subtle, almost surprising ways. From how people process emotions to how they navigate social interactions, intelligence manifests in ways that might not immediately scream “genius.”

Today, we dive into the less obvious traits that point to a high IQ.

How many of these signs do you or the people around you have?

Let’s find out. 

1) You are a cat person

It turns out that your choice of pet could be a subtle clue to your intelligence.

According to a 2017 study, individuals who identified as “cat people” outperformed those who preferred dogs in tests measuring abstract reasoning, self-reliance, and overall intelligence.

While dog lovers may excel in social and cooperative environments, cat lovers often show stronger tendencies toward independent thinking and problem-solving—both hallmarks of high intelligence.

2) You’re not very physically active 

Here’s one that might surprise you. It surprised me, at least. 

Science suggests that highly intelligent individuals may be less physically active than others.

A 2016 study published in the Journal of Health Psychology revealed that people with higher IQs tend to exercise less than those with more average intelligence.

This might be because they prefer mentally stimulating activities over physical exertion. Instead of hitting the gym, they’re more likely to be found deep in thought, solving puzzles, or engaging in intellectual debates—prioritizing mental workouts over physical ones.

3) You are a night owl

If you find someone staying up late, don’t be too quick to judge. Multiple sources, including WebMD, have linked night owl tendencies to higher intelligence.

Instead of the classic “early bird catches the worm,” it seems the saying should be updated to “the night owl catches the worm” when it comes to IQ.

4) You’re introverted

It might not shock you to learn that most gifted individuals are introverts.

In fact, research cited by CNBC suggests that around 70% of highly intelligent people fall into this category. Think of famous minds like Einstein, Darwin, and Newton—solitary thinkers who thrived in their own inner worlds.

However, it’s important to note that the difference between introverts and extroverts in terms of intelligence only becomes significant at the extremes. Basically, while introversion might be more common among the highly gifted, it’s not a guarantee of a higher IQ.

5) You struggle with anxiety

It’s not all perks when it comes to having a high IQ.

Unfortunately, anxiety is often a common companion for the highly intelligent.

Studies highlighted by Psych Central reveal that those with superior intelligence frequently experience heightened levels of anxiety. Why?

It could be due to their constantly active minds, which make it difficult to switch off and relax. Or maybe it’s their tendency to overanalyze everything, seeing threats or potential issues that others might miss due to their heightened awareness.

6) You have an insatiable curiosity

Ever met someone who never stops asking questions or diving deep into random topics?

Well, according to WebMD, this intense curiosity is a hallmark of genius, especially in children.

But it doesn’t stop there. Highly intelligent people often carry this burning need to constantly learn and explore well into adulthood.

Do you find yourself always searching for new information or challenging your understanding of the world?

If so, you might be tapping into the same curiosity that drives many of the world’s most brilliant minds.

7) You reject social norms

Last but not least, highly intelligent people tend to break away from the mold.

Think of Einstein, who famously refused to wear socks, or Nikola Tesla, who had obsessive rituals like pacing for hours. Even Benjamin Franklin and Theodore Roosevelt were known for their love of freezing cold swims.

Basically, geniuses often march to the beat of their own drum, embracing eccentric habits and lifestyles.

Beyond these individual quirks, studies also suggest that those with higher intelligence are more likely to challenge mainstream conventions, often identifying as liberal or atheist and thinking critically about widely accepted beliefs.

The bottom line 

These surprising signs of intelligence show that being highly gifted isn’t always about acing tests or having a fancy degree.

Whether you’re a night owl, an introvert, or someone who challenges the norm, intelligence comes in many forms. Curious to learn more?

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