30 Amazing Facts About Your Brain That Will Blow Your Mind

The brain is one of the most astonishing and intricate parts of the human body. Here are some strangely interesting facts about your gray matter.

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brain facts
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Your brain is extremely powerful

The human brain is responsible for keeping your body running all day long. It not only helps people think and learn new things, but it also controls your movement and speech, too. The brain is part of the central nervous system and receives tons of information.

Make some room in your noggin for these surprising brain facts you need to know.

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Graphic of human brain with lightning bolts all around
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The brain itself can’t feel pain

Ever wonder how brain surgeons are able to perform surgeries on patients while they’re awake? Beth McQuiston, MD, a neurologist and the medical director of the diagnostics division at the health-care company Abbott, explains that even though the brain has layers of coverings and blood vessels that contain pain receptors, the brain itself has zero. When a person has a headache, for example, it’s often thought of as pain stemming from the brain, but this is actually not the case. The muscles and skin surrounding the brain, however, can feel pain.

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Graphic of human brain
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Your brain is greedy

Your brain might account for only about 3 percent of your body weight, but it receives about 30 percent of the blood being pumped by your heart. This shows how much attention and support it requires in comparison to the other seemingly important areas of your body. “The brain is like a spoiled and demanding child, but yet it is extremely smart and efficient,” explains Bennet OmaluMD, a forensic pathologist, neuropathologist, epidemiologist, clinical professor at the University of California, Davis, and author of Truth Doesn’t Have a Side. “It takes the brain about 1/10,000th of a second to respond to something and generate an action.”

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Graphic of human brain with light bulb on top
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You actually do use most of your brain, most of the time

The film Limitless with Bradley Cooper is just the latest version of the myth that we only use 10 percent of our brain. “This misconception came about because the brain is so adaptable that sometimes minor damage causes only subtle problems,” explains Brett Wingeier, PhD, engineer, neuroscientist, and co-founder of Halo Neuroscience. “The fact is, most of your brain is constantly working—to sense, process, think, move, and even dream.” Even when you head to sleep at night, your brain is still hard at work. (Don’t miss these research-backed ways to train your brain for success.)

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Graphic of human brain "sleeping" with stars and Zzzz's all around
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Brain waves are even more active while you’re dreaming

When you’re fast asleep, you might think that your brain is “shut off,” but it’s actually doing a whole lot more than when you’re walking, talking, eating, and thinking. “When awake, people utilize alpha and beta waves, which gives us day wakefulness,” explains Brandon Brock, a certified family nurse practitioner and staff clinician at Foundation Physicians Group. “Sleep, however, especially in the initial stages, uses Theta activity, which is greater in amplitude than Beta.”

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Graphic of a neuron
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Adult brains still make new neurons

While most of our neurons have been with us since birth, and age does take a toll, your brain still makes new neurons. “This process, known as neurogenesis, occurs in a special region called the dentate gyrus,” explains Wingeier. “These neurons are thought to be important for learning, memory, and responding to stress.” These brain facts have been highly debated, but a 2019 study published in the journal Nature Medicine that looked at the brain tissue of 58 recently deceased people found that the adult brain can indeed generate new neurons. How can you boost neurogenesis in your own brain? Wingeier says through healthy living—things like sleep, exercise, and a balanced diet.

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Graphic of human brain with light bulb on top and electrical cord coming out of bottom
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Almost half of a child’s energy goes to fuel his or her brain

In order for the brain to stay running at top-notch, it requires significant amounts of energy. And this is even more true for young children who are still learning, processing, and developing at a fast rate. “Scientists at Northwestern University discovered recently that in the preschool years, when a child’s brain development is faster, physical growth is slower, possibly to save more energy for the developing brain,” explains Wingeier. “Conversely, during puberty, when physical growth is faster, brain development is slower—which may come as no surprise to parents of teenagers.”

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Graphic of multiple connected glial cells
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The majority of brain cells aren’t neurons

Did you know that for all the neurons in the brain, there are at least as many glial cells that support and protect these neurons? “These microscopic unsung heroes make sure neurons have a constant supply of nutrients and oxygen, insulate neurons from each other, and even help clean up after neural damage,” says Wingeier. “They even help optimize communication between neurons.”

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Graphic of human brain "lifting weights"
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Exercise is just as good for your brain as it is for your body

Professional athletes know how important fueling their brain is to ensure they’re able to put maximum effort and energy into their workouts. “This is because of the mental stimulation that comes with exercise, but also because a healthy cardiovascular system means better plumbing for the brain,” says Wingeier. Especially when you try a new fitness class or regimen for the first time, your brain is working hard at learning the motions and controlling your muscles. (Check out these other healthy habits that can boost your brain health.)

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Graphic of eyeball
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You can “see” through your ears

Neuroplasticity, or the brain’s ability to reorganize and change itself throughout a person’s lifetime, is a truly remarkable thing. In one 2011 study published in the Proceedings of the National Academy of Sciences, University of Montreal researchers compared the brain activity of individuals who were born blind and those who had normal vision. They found that the part of the brain that’s normally wired to work with our eyes can instead rewire itself to process sound information instead of visual perception. Pretty cool, right?

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Graphic of human brain with two eyes
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The visual areas of the brain are in the very back

These brain facts might sound counterintuitive, considering your eyes are in the front of your head, but the part of your brain responsible for vision, the occipital lobe, is located in the back. “Bang someone on the back of the head and they will see stars, not sounds,” says Henry Soper, PhD, a former clinical psychology faculty member in the School of Psychology at Fielding Graduate University. Similarly, the left side of your brain controls the vision on your right side and vice versa. The same goes for how our brain processes sound—on opposite sides of the head. “Although evolutionary theories have been proposed, the bottom line is we really do not know why,” Soper says.

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Graphic of human brain with hearts emanating
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Brain scans can “light up” when a person is in love

Some may think that being “in love” is only an idea or merely a term people use, but brain scans reveal otherwise. “For people who are romantically in love, functional MRI brain scans can show activity where dopamine, the ‘feel-good’ neurotransmitter, is present,” says Dr. McQuiston. “Other areas in the brain associated with pleasure and reward can also show greater activity for people who have fallen in love.” (Psst: Here’s what happens to your brain when you have sex.)

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Graphic of human brain with thumbs-up hand extending out
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Your brain activity is as unique as your fingerprints

Research published in the journal Nature Neuroscience suggests that a person’s brain activity may be as unique as his or her own fingerprints. To reach their conclusion, scientists used functional magnetic resonance imaging (fMRI) to create “connectivity profiles,” which allowed researchers to identify the brain activity of more than 100 individuals. “Learning about individual brain connections offered scientists specific insights about an individual’s intelligence or personality,” explains Dr. McQuiston. “This could have implications for how scanning brains might be used in the future to one day help individualize care for each unique person.”

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Graphic of human brain
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Your brain is smaller than your ancestors’

This might be one of the scariest of these brain facts when you really think about it, but paleoanthropological research suggests that our brains are shrinking. Skeletal evidence from every inhabited continent backs up this theory. Some scientists suggest that this may be related to the fact that the average body size of humans has also shrunk in size over the last 10,000 years. “A larger body requires a larger nervous system, so, as our bodies grew smaller, so did our brains in response,” suggests Donald Krieff, DO, a board-certified neurosurgeon.

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Graphic of human brain with glial cells or neurons emanating
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The brain has more cell types than any other tissue in our body

Unlike the liver or certain muscles in our body where most of the cells are the same type, the brain is composed of a variety of complicated, interconnected types of cells, one being neurons, explains Hermona Soreq, PhD, professor of molecular neuroscience at the Hebrew University of Jerusalem’s Edmond and Lily Safra Center for Brain Sciences. (To prevent memory loss and sharpen your mind, try these mini-mental workout exercises.)

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Graphic of human brain with light bulb on top
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When you’re awake, your brain produces enough electricity to power a small light bulb

According to computer scientists at Stanford University, a robot with a processor that is virtually as intelligent as the human brain would need at least 10 megawatts of electricity to work properly. “Neurons in the brain do make enough electricity to run a light bulb—100 billions of cells generate this amount of energy,” explains Brock. And the brain works fast, too—so fast that it’s speedier than the world’s greatest computer. “The information going to your brain from your arms and legs travels at 150 miles per hour.”

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Graphic of two human brains with musical notes all around
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The brain waves of two musicians can synchronize when performing together

There’s a scientific reason why your favourite bands and musicians blend together harmoniously. A team of scientists at the Max Planck Institute for Human Development in Berlin, Germany, used electrodes to record the brain waves of 16 pairs of guitarists as they played the same musical sequence. Even though the two individuals in each pair played different parts, their brain waves synchronized. “This study suggests that there’s a neural blueprint for coordinating actions with others,” explains Brock. “Brainwaves, neurochemicals, and some say even heartbeats start to sync and become similar in those singing together or in choirs.”

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Graphic of human brain with ice cubes
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“Brain freeze” is actually your brain recognizing a drop in temperature

It’s true. In an effort to save you from freezing to death, your brain leaps into action when it senses a drop in temperature on your palate. “Your brain quickly increases blood pressure in an effort to tell you to slow down or take it easy,” says Brock. “The scientific term is sphenopalatine ganglioneuralgia and is a way for your brain to say that it is turning up the brakes on what you are doing to prevent unwanted changes due to temperature.”

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Graphic of human brain with open book
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Reading aloud uses different brain circuits than reading silently

Researchers have long understood that children first learn to read by speaking words out loud and only once that knowledge has been established can they learn to read to themselves.Environmental noise versus chaotic noise versus noise discrimination all use different channels,” explains Brock. In the same vein, noise in the form of music is processed differently than regular speech, various pitches and frequencies, and different harmonies, as well. (Learn why reading is so important for your brain.)

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Graphic of human brain
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Your brain is mostly fat

Yep—your thinking cap is the fattiest organ in your body, consisting of a minimum of 60 percent fat. This is why a diet rich in healthy fats, such as omega-3s and omega-6s, is vital for brain and overall body health. “Fat stabilizes the cell walls in the brain and carries, absorbs, and stores fat-soluble vitamins in your bloodstream,” explains Brock. “It also reduces inflammation and helps the immune system regulate and function properly.”

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Brain cell with oxygen tank
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Brain cells can only survive on oxygen and glucose

These two nutrients are incredibly vital to the functioning and survival of the human brain. It takes the brain anywhere from three to five minutes to suffer irreversible damage when it is starved of oxygen or glucose. As Dr. Omalu explains, the brain controls and drives the heart and lungs and controls our consciousness. This is why most deaths are never instant. “Even if a human being is decapitated, the brain does not suffer irreversible damage and death until several minutes after decapitation.”

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Graphic of human brain with words Hallo, Bonjour, Hola and Ciao
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The brain is not permanently arranged at birth

Nope—those nerve cells in your noggin continue to change based on how often they’re used and stimulated in the first year of life. This is especially true for speech and language. “Some toddlers have to undergo extensive brain resections for medical reasons, and these procedures may, unfortunately, mean removing the primary language center in the brain,” explains Jennifer Bickel, MD, pediatric neurologist and director of the Comprehensive Headache Clinic at Children’s Mercy Kansas City. “If adults undergo a similar procedure, they are often unable to communicate through written or verbal language. However, [a young child’s] brain is so adaptable that it will reorganize itself and the ability to use language will be retained.” It’s this ongoing ability of the brain to adapt that is the reason why young children require regular exposure to language.

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Graphic of human brain with word "download" and download arrow
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Reading allows your brain to directly download information

“Although the headsets of science fiction are still far off, technology—like the printing press—has been amplifying human abilities and helping us learn, process, and communicate for centuries now,” explains Wingeier. But why does this count as a brain-machine interface? When you learned to read, your brain had to change and restructure itself so your visual and language systems could transfer information from the page into your working memory. “Now, we’re augmenting our brains further with smartphones and Google searches,” he says. “And, just like the science-fiction headsets, it’s up to us to use them wisely.”

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Graphic of human brain with brain waves
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The harder your brain is working, the smaller your brain waves

As it’s working, your brain is creating electric fields. “The fields are measured on your scalp, called the electroencephalogram (EEG), and are often larger when your brain is doing less,” explains Wingeier. “This is because idle neurons sync up by default—so like a crowd chanting in unison, they can be ‘heard’ from far away.” Neurons processing more information sync up in more complex patterns, so like a crowd in which people are having a thousand different conversations, they’re harder to “hear” clearly.

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Dinosaur with human brain on top
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Dinosaurs lacked the ability to think and reason

There’s plenty that scientists are still discovering about the long-lost reptiles that roamed the earth 65 million years ago. But what they do know is that dinosaurs couldn’t think or reason the way humans can. “Dinosaurs had no neocortex, which we use for thinking and such, and no frontal lobes, which we use for planning and problem-solving,” says Soper. “Dinosaur thinking is more along the lines of chicken thinking: They could learn certain things, but minimally compared to mammals.” They did, however, have a killer sense of smell that was far, far better than we humans have.

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Graphic of human brain
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While we slow down as we age, much of our brain stays intact

“As many civilizations have said, the older folk know more because of their experience, even though their memory may not be as good,” says Soper. “With regard to aging, the mind that stays active and exercises will not show the decline that others may show.” Of course, this involves exercising the brain daily, which is why crossword puzzles and games like Sudoku, bingo, and mahjong can be incredibly helpful for the elderly. “If the elderly pick up mental exercises, their intelligence may actually go up,” explains Soper, “and the same is true of the body and its exercises.” (FYI: These habits age your brain.)

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Graphic of human brain with depiction of the cloud
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Your brain’s storage capacity is virtually unlimited

There’s no such thing as knowing too much—or learning so much that you can’t retain any more information (though it can certainly feel that way after sitting through a long board meeting). “Your brain doesn’t get ‘used up’ like the data storage in your computer or smartphone,” says Dr. Krieff. “There is endless brain power! Although lack of sleep can affect your brain’s ability to create more memories.”

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Graphic of "traveling" human brain with sunglasses, suitcase and map
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Use it or lose it

The brain is similar to a muscle, explains Shirley Newell, MD, former chief medical officer at Aegis Living. “You can build up your ‘cognitive reserve,’ or your brain’s innate ability to get a job done, through different types of learning and or through new experiences.” People with a stronger and healthier cognitive reserve—one that’s been strengthened with learned experience—have been shown to be more capable of coping with unexpected life events.

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Graphic of human brain with flash drive
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Short-term memory generally lasts around 20 to 30 seconds

Ever wonder how you can say something, get distracted briefly, and then completely forget what you were about to say? This has to do with your brain’s capacity for holding small amounts of information in the active mind. It keeps that information in an available state for easy access, but only does so for a period of around a half a minute. Brock notes that when recalling numbers, specifically, most people hold the memory for around 7.3 seconds on the average and 9.3 seconds on average for letters. (Learn the powerful way meditation can change your brain.)

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Graphic of human brain with scalpel and knife
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Surgical removal of almost half our brain is possible with little or no effect on personality or memory

These brain facts might sound crazy, but a hemispherectomy, or the surgical removal of half of the brain, can and does happen. It’s a very rare neurosurgical procedure that is used to treat a variety of seizure disorders. However, this type of procedure, as one would imagine, is not done without impact. “Some traits are very specific to one hemisphere, thus it can give us very subtle differences,” says Brock. “Usually memory, humour, and personality will recover, but cognition might change a little.”

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Graphic of human brain "sleeping" with stars and Zzzz's all around
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Sleep deprivation can affect the brain in many ways

There’s a reason that a solid seven to nine hours of sleep per night is recommended: Your body and your brain require rest in order to function properly, retain memory, and react in a timely manner. Judgment is even impaired when a human has not had a proper night’s rest. “Sleep deprivation kills brain cells, can create psychosis if long enough, and will reduce the ability of the body and the brain to heal,” says Brock. “All of these things can impact cognition, judgment, or reaction time.”

If you found these brain facts mind-boggling, next learn how to train your brain to hate junk food.

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Originally Published on The Healthy

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