1. The Adult Brain Is Not Fixed but Continuously Plastic
Many people believe that the brain fully develops around age 25 and then enters a fixed state without fundamental changes. However, modern neuroscience reveals a far more complex and hopeful reality.
The adult brain also possesses powerful “plasticity,” allowing it to continually reshape its structure and functions through learning and training. One of the most iconic examples is the story of London taxi drivers. To qualify for the job, they must pass the notoriously difficult “Knowledge” exam, which requires memorizing 320 different routes, 25,000 street names, 20,000 landmarks and points of interest across London — even being able to instantly navigate any address requested by a passenger.
These drivers spend 3 to 4 hours daily in intense training and can plan optimal routes mentally between any two points in the city without map assistance. Neuroscientists have found that the posterior hippocampus (a brain region crucial for spatial memory and navigation) in these drivers is significantly larger than in ordinary people — and the more driving experience they have, the more developed this area becomes.
This demonstrates that the adult brain is not rigid but can undergo substantial structural changes through long-term specialized training. Similar studies reveal unique features of Albert Einstein’s brain — the brain region controlling left-hand finger movement was unusually developed, forming a distinctive “omega sign” sulcus. This morphology is also common among experienced violinists and pianists, reflecting how the brain adjusts itself based on personal experience and skill acquisition.
In other words, all your experiences and learning since birth deeply sculpt your brain’s neural networks and cortical folds, shaping a uniquely individual brain structure. This plasticity not only equips us to adapt to our environment but also provides the scientific basis for lifelong learning and maintaining cognitive vitality.
2. Keeping the Brain Active Slows Aging
Not only in youth but even in old age, brain health and vitality remain strongly influenced by environment, behavior, and psychological state. Professor David Bennett and his team at Rush University in Chicago analyzed over 350 donated brains, uncovering key factors behind cognitive health in late life.
Most samples came from a religious project where nuns donated their brains after death for scientific study. The original goal was to find exact links between common dementias such as Alzheimer’s, strokes, Parkinson’s disease, and cognitive decline. Surprisingly, many brains showed Alzheimer’s pathology yet the individuals had no cognitive symptoms.
Further analysis found that a person’s psychological state played a decisive role in cognitive health. Negative emotions like loneliness, anxiety, and depression were closely linked to rapid cognitive decline. In contrast, people with strong responsibility, clear life purpose, and busy lifestyles effectively protected their cognitive functions.
This can be explained by the “cognitive reserve” theory: when some brain areas deteriorate from disease or aging, other areas can compensate through new connections and functional reassignment. It’s as if the brain is a toolbox — cognitively healthy brains have more alternative pathways and solutions, allowing flexible responses to damage and challenges.
The best way to maintain cognitive health is to continuously “challenge” the brain, especially by learning new skills, staying socially engaged, and solving complex problems. These activities stimulate neural network remodeling and expansion, slowing age-related cognitive decline. While we cannot stop time, scientific methods help us maximize brain function preservation and extend the lifespan of the “young brain.”
3. The Science Behind “Practice Makes Perfect”: Skills Become Hardwired in the Brain
The saying “practice makes perfect” is not just an experience-based conclusion but has solid neuroscience foundations. The author’s personal encounter with Austin Naber, the 10-year-old world champion in sport stacking, vividly illustrates this process.
Sport stacking requires competitors to stack and unstack plastic cups in complex sequences with quick, dexterous hand movements within seconds. Austin can complete a complex routine in 5 seconds, whereas the author, even after 20 minutes of practice, can only achieve about one-eighth of the same.
Electroencephalogram data show Austin’s neural networks have formed specialized, efficient connections for this skill — his brain has essentially “burned in” the procedural memory of the stacking actions. By contrast, the author’s brain is still using a “general cognitive processor,” requiring conscious thought and high energy to perform the same moves.
What we call “muscle memory” is actually the cortex and neural networks developing automated programs through long-term training. When a skill is “written” into the brain’s hardware, executing the same actions is faster, more energy-efficient, and requires less conscious control.
This explains why top athletes can enter the “flow” state and perform extraordinary feats. Rock climber Dean Potter trained from age 12 and, through years of intense practice, hardwired complex, precise movements into unconscious neural circuits. While climbing, he relies entirely on these trained networks without conscious involvement, allowing ultra-efficient performance that safeguards his life.
Similarly, a baseball pitcher’s fastball can reach speeds of 160 km/h, and the batter completes the hitting action in less than 0.4 seconds — far faster than conscious thought allows — relying entirely on the brain’s automatic neural circuits.
This reveals both the advantages and limits of skill automation: once a skill reaches the unconscious level, responses are rapid and energy-saving, but deliberate interference can degrade performance. This reflects the brain’s high-level optimization and is a hallmark of training and proficiency.
The brain’s plasticity and adaptability exceed our imagination. Whether it’s adult spatial memory, skill proceduralization, or maintaining cognitive vitality to slow aging, science reveals how the brain continuously reshapes, optimizes, and protects itself.
The science advisor of “Westworld” uses these research findings to tell us: the brain is not a static machine but a vibrant dynamic system. Through continuous learning, new skill training, and a positive life attitude, we can all “remodel” our brains to live wiser, healthier, and more fulfilling lives.