6 Common Myths About the Brain (That Are Holding You Back)

Despite incredible advances in neuroscience, many outdated beliefs about the brain still circulate in popular culture. These myths often appear in movies, self-help books, and everyday conversations.

The problem is that believing them can limit how we think about our own potential.

Let’s look at six common brain myths—and the truth behind them.

Myth #1: Humans Only Use 10% of Their Brain

This is one of the most persistent myths about the brain. Movies often suggest that if we could unlock the remaining 90%, we would develop superhuman abilities.

In reality, brain scans show that most areas of the brain are active throughout the day, depending on what we are doing. Even simple activities require multiple brain systems working together.

If we truly used only 10% of our brain, damage to the other 90% would have no effect—which clearly isn’t the case.

The truth is not that we use only part of our brain.The real challenge is learning how to use our entire brain more effectively.

Myth #2: The Brain Cannot Change

Many people believe personality and intelligence are fixed. According to this idea, once the brain develops, it stays mostly the same.

Neuroscience tells a different story.

The brain has an extraordinary ability called neuroplasticity, which means it can reorganize itself by forming new neural connections throughout life. Learning new skills, practicing habits, exercising, and even changing thought patterns can reshape the brain.

In other words, your brain is not fixed.

It is constantly adapting—and you can actively participate in that process.

Myth #3: People Are Either “Left-Brained” or “Right-Brained”

You may have heard that logical people are “left-brained” and creative people are “right-brained.”

While certain brain functions are more dominant in one hemisphere, almost all meaningful activities—writing, problem solving, music, creativity—require both sides of the brain working together.

No one is purely left-brained or right-brained.

The most powerful thinking comes from integration across the whole brain.

Myth #4: Humans Have the Largest Brain

Many people assume humans must have the largest brains in the animal kingdom because of our intelligence.

In reality, the sperm whale has a brain weighing around 8 kilograms—more than five times the weight of the human brain. Even elephants have larger brains than humans.

Brain size alone does not determine intelligence. What matters more is how efficiently the brain’s networks are organized and used.

Myth #5: Athletes Aren’t Smart

This stereotype often appears in school culture: the idea that athletic students are less academically capable.

But research shows that physical activity improves brain function in several ways. Exercise increases blood flow to the brain, supports the growth of new neurons, and enhances cognitive performance.

In fact, many studies show athletes often have faster reaction times and strong decision-making abilities.

Movement isn’t the opposite of learning—it’s part of it.

Myth #6: Humans Are Purely Rational

For centuries, humans liked to think of themselves as perfectly rational beings. But behavioral economists and psychologists have demonstrated that our decisions are often influenced by biases, emotions, and subconscious processes.

This doesn’t mean we are irrational creatures.

It means our brain includes both emotional and analytical systems, and learning to manage both is essential.

The Bigger Lesson

Understanding the brain helps us move beyond limiting beliefs about ourselves.

Instead of thinking in terms of fixed abilities—smart or not, creative or not—we can focus on developing the brain’s full potential.

The goal isn’t just knowing facts about the brain.

The goal is becoming the master of how your brain works.

And that changes everything about how we learn, work, and grow.