The Brain that Changes Itself
Norman Doidge, M.D.
37 min
6 Key Points
4.6 RateWhat's inside?
Explore the remarkable capacity of the human brain to change and adapt. This book shares inspiring stories from the forefront of brain science, revealing our brain's incredible ability to heal and transform.
You'll learn
1. How your brain can change and adapt2. Inspiring stories of people beating brain disorders3. Tips to boost your brain power and mental health4. How your actions and surroundings shape your brain5. The latest cool stuff in brain science6. Using brain change tricks for personal growth in daily life.Key points
01The Machine That Fixes Itself
We have all been told at some point that our brains are hardwired, much like a complex computer operating with fixed, unchangeable circuits. It is finally time to throw that outdated and incredibly limiting metaphor right out the window. To truly appreciate the magnitude of neuroplasticity, we first need to understand the dark ages of neuroscience. For hundreds of years, the prevailing scientific dogma was known as "localizationism." Pioneered by early neurologists like Paul Broca in the nineteenth century, this theory suggested that the brain was essentially a highly specialized machine. Every single mental function—whether it was language, vision, motor control, or memory—was believed to be permanently hardwired into one specific, unalterable geographical location in the brain. The logic seemed perfectly sound at the time: just like a car engine, if a vital part breaks down, the machine loses that function forever. This mechanical metaphor created a profound sense of neurological nihilism. It meant that brain damage was an absolute life sentence. It meant that human intelligence and talents were strictly genetic lotteries. If you were born with a cognitive deficit, or if you suffered a traumatic brain injury, the medical community essentially told you to just learn to live with your permanent disability. But what if the brain is not a rigid machine at all? What if it is actually a dynamic, living, and breathing ecosystem that constantly reshapes itself? This is the magnificent reality of neuroplasticity. The word itself perfectly describes the phenomenon. "Neuro" refers to the neurons, the microscopic nerve cells that act as the foundational building blocks of our entire nervous system. "Plastic" comes from the Greek word plastikos, which means mutable, moldable, and capable of being shaped or formed. When we put these two concepts together, we get a beautifully empowering truth: the brain can rewrite its own structural anatomy. Consider the astonishing and deeply moving story of Pedro Bach-y-Rita, a brilliant sixty-five-year-old poet and respected scholar living in New York. In 1959, Pedro suffered a massive, devastating stroke that paralyzed half of his body and completely destroyed his ability to speak. The medical experts of the era examined his brain, saw the extensive tissue damage, and sent him to a rehabilitation center, essentially waiting for him to live out his remaining days in a wheelchair. They believed the "speech center" and the "motor center" of his brain were permanently destroyed. But Pedro’s son, George, a determined medical student, absolutely refused to accept this grim prognosis. George took his severely disabled father to Mexico and decided to treat him not as a dying patient, but as a newborn baby who simply needed to learn how to move all over again. The rehabilitation program George designed was wildly unorthodox and intensely grueling. He put his elderly father on the floor and encouraged him to crawl. Day after day, week after week, Pedro dragged his paralyzed body across the floor. For months, there was absolutely no visible progress. It seemed like a foolish endeavor. But eventually, a tiny twitch appeared in Pedro’s paralyzed arm. Then a slight movement in his leg. Through relentless, exhausting daily practice, Pedro progressed from crawling to walking, and eventually, he miraculously regained his ability to speak. The recovery was so profoundly complete that Pedro actually returned to teaching full-time at City College in New York, living an active and vibrant life until he passed away from a heart attack several years later. The true miracle, however, was discovered during Pedro’s autopsy. When scientists examined his brain, they were absolutely stunned. The massive lesion from his original stroke was still there. The brain tissue that had died in 1959 had never healed. So, how on earth did Pedro walk and talk again? The answer lies in the magic of neuroplasticity. Because of the intense, repetitive physical demands George placed on his father, Pedro’s brain had completely reorganized itself. It had essentially built a neurological detour. Healthy, undamaged areas of the brain that were previously completely unrelated to movement or speech had physically rewired themselves to take over the jobs of the dead tissue. The brain had healed the man without healing the original wound. This story forces us to ask a deeply personal question: how often do we give up on learning a new skill, overcoming a personal flaw, or healing from an emotional trauma because we falsely believe we are just "wired this way"? The myth of the unchanging brain has held humanity back for generations. Understanding that your brain is a malleable, self-healing organ is the first crucial step toward true personal transformation. Every single time you learn something new, you are not just acquiring information; you are physically altering the microscopic structure of your mind.
02Seeing the World Through Your Tongue
Have you ever wondered if our senses are strictly interchangeable, or if our eyes are the absolute only way we can truly experience vision? Prepare to be completely amazed by unorthodox scientists who figured out how to brilliantly bypass the eyes entirely. We naturally assume that we see with our eyes, hear with our ears, and taste with our tongues. But this is actually a fundamental misunderstanding of human biology. Our eyes are essentially just sophisticated biological cameras; they are absolutely blind on their own. They merely collect photons of light and translate them into electrical impulses. It is the brain—specifically the visual cortex nestled at the very back of your head—that takes those electrical signals and constructs the beautiful, colorful, three-dimensional world you experience. The brain itself sits in complete silence and absolute darkness inside the thick vault of your skull. It only knows the world through the electrical morse code sent to it by your sensory organs. This profound realization led a visionary neuroscientist named Paul Bach-y-Rita the other son of Pedro Bach-y-Rita to ask a spectacular question: If the brain is completely plastic, and if it only interprets electrical signals, does it really care where those signals come from? Could we theoretically plug a camera into a completely different part of the human body and teach the brain to "see" through it? To test this wild hypothesis, Paul built a fascinating tactile vision machine. He took individuals who had been completely blind since birth and sat them in a modified dentist’s chair. Behind the chair, he set up a large video camera. The camera captured the visual scene in front of the blind person and translated those images into electrical signals. These signals were then sent to a grid of four hundred vibrating metal pins pressed firmly against the blind person’s back. If a person walked in front of the camera, the pins would buzz the shape of that person onto the subject’s skin. At first, the blind subjects just felt a chaotic, confusing buzzing sensation on their backs. It was nothing more than a weird massage. But then, Paul allowed them to control the camera. They started moving the camera left and right, manipulating the visual feed. Suddenly, a biological miracle occurred. As the subjects engaged with the machine, their brains began to recognize patterns. The plastic brain realized that the buzzing on the back wasn't just random touch; it contained highly structured spatial information. Within a few hours of practice, the subjects stopped feeling the buzzing on their skin and actually began to perceive objects in three-dimensional space. They could identify faces, read dials on instruments, and even catch a ball rolled across the floor. The brain had literally rewired its visual cortex to process information coming from the skin. Decades later, Paul’s team perfected this technology, leading to the astonishing story of Cheryl Schiltz. Cheryl was known as a "wobbler." Due to a severe side effect from a common antibiotic, her vestibular apparatus—the delicate balance system located inside the inner ear—was completely destroyed. Without a functioning balance system, Cheryl felt like she was perpetually falling down a bottomless pit. She could not walk without clinging to walls, and the constant, intense vertigo left her exhausted and deeply depressed. She had lost her independence entirely. Paul’s team introduced Cheryl to an upgraded, miniaturized version of the sensory substitution device. Instead of a giant chair, it was a hard hat equipped with a tiny sensor that measured head tilt. This sensor was connected to a small plastic strip containing a grid of electrodes, which Cheryl placed directly on her tongue. Why the tongue? Because the tongue is incredibly sensitive, packed with nerve endings, and constantly bathed in highly conductive saliva. When Cheryl put the device on, the electrodes fizzed on her tongue like popping candy, shifting the fizzing sensation depending on how she tilted her head. Within mere minutes of focusing on the tongue signals, Cheryl’s brain decoded the new information. She stood up. She let go of the walls. For the first time in five agonizing years, she stood perfectly still, balanced, and at peace. She began to cry tears of profound relief. Her brain had successfully bypassed her destroyed inner ear and was now receiving its balance information entirely through the nerves in her tongue. But the most incredible part of Cheryl’s story is what happened when she took the device off. The scientists expected her to immediately fall over, returning to her wobbler state. But she didn't. She remained perfectly balanced for several minutes. This is known as the residual effect. By using the device, Cheryl had forced her plastic brain to forge brand new balance pathways. The more she trained with the tongue device, the longer the residual effect lasted. Eventually, she could wear the device for just twenty minutes a day and maintain perfect balance for the rest of the week. She got her life back. What does this mean for our everyday lives? It reveals that our brains are incredibly versatile, general-purpose processors. If a traditional pathway in your life or your mind is blocked, you are not permanently stuck. The brain possesses the miraculous ability to forge entirely new roads to reach the exact same destination. We are limited only by the environments we expose ourselves to and the challenges we are willing to tackle.
Continue reading with LeapAhead app
Full summary is waiting for you in the app
03Rewiring the Broken Learning Machine
04Mapping the Landscape of Your Mind
05Escaping the Trap of Dark Plasticity
06Conclusion
About Norman Doidge, M.D.
Norman Doidge, M.D., is a psychiatrist, psychoanalyst, and researcher from the University of Toronto. He is renowned for his work on neuroplasticity and has written extensively on the subject. His best-known work, "The Brain That Changes Itself," has been published in over 100 countries.
