How to Rewire Your Adult Brain and Learn Faster

TL;DR

The adult brain can change massively when the right conditions are set, not just the young brain. Rewiring happens when neuromodulators like acetylcholine, norepinephrine, serotonin, or dopamine are released during learning, paired with alertness, effortful focus, reflection, and sleep. This overturns the old belief that plasticity closes after childhood.

Transcript

Welcome to the Hubberman Lab podcast, where we discuss science and science-based tools for everyday life. I'm Andrew Huberman and I'm a professor of neurobiology and opthalmology at Stanford School of Medicine. My guest today is Dr. Michael Kilgard. Dr. Michael Kilgard is a professor at the University of Texas at Dallas, and he is one of the world'... Read More

Key Insights

• Neuroplasticity is the brain's ability to change in response to experience, and it works in both directions, meaning circuits can be wired for better or for worse depending on what is repeatedly practiced and reinforced.
• The adult brain can be rewired massively if the right conditions are set, a finding Dr. Kilgard and his colleagues established in the late 1990s that overturned the century-old belief that only the young brain can change.
• Neuromodulators are the trigger for adult rewiring: when acetylcholine, norepinephrine, serotonin, or dopamine are released in the adult brain, brain circuits can reorganize and learning can occur even outside childhood.
• Vagus nerve stimulation lets researchers precisely control the timing of neuromodulator release, and Kilgard's lab has used it to help people overcome tinnitus, stroke effects, and restore mobility after spinal cord injuries.
• The brain is constantly active, evaluating trillions of new connections every second and deciding whether to strengthen, weaken, or leave each one unchanged, which matches our lived sense of an active inner life.
• Developmental plasticity is highest from birth to about age 25, after which change becomes harder but is still possible, so the window for learning stays open far longer than the old zero-to-six emphasis suggested.
• No single formative experience determines a child's life, because learning depends on vast numbers of experiences rather than any one moment, which is both a caution about details and a relief for parents.
• Children largely train themselves through practice, picking up around 100,000 words and dextrous movements by exploring their environment, so the adult role is to set conditions where a child can succeed and not quit.

Questions & Answers

Q: Can the adult brain still change, or is neuroplasticity only for children?

The adult brain can change massively if the right conditions are set. For over 100 years it was assumed only the young brain could learn new languages and skills, but in the late 1990s Dr. Kilgard and his colleagues showed that adults can achieve substantial rewiring when specific neuromodulators are triggered in the brain, opening an entirely new field within neuroscience with implications for health and disease.

Q: What triggers the adult brain to rewire itself?

Rewiring in the adult brain is triggered by the release of specific neuromodulators, namely acetylcholine, norepinephrine, serotonin, or dopamine. When these chemicals are released in the adult brain during an experience, brain circuits can reorganize and learning can occur. The description also notes that alertness, effortful focus, post-learning reflection, and sleep are needed to induce neuroplasticity, making these behavioral states part of the process.

Q: How does vagus nerve stimulation help with neuroplasticity?

Vagus nerve stimulation is used to precisely control the timing of neuromodulator release. The vagus nerve connects the body with the brain and the brain with the body, and by stimulating a particular branch of the vagus nerve pathway, Kilgard's laboratory has shown that people can overcome debilitating conditions such as tinnitus, stroke, and even restore mobility to people who have suffered spinal cord injuries.

Q: What conditions can vagus nerve stimulation and related therapies treat?

According to the episode, vagus nerve stimulation and related neuroplasticity therapies have been applied to tinnitus, stroke, and spinal cord injuries, with the lab restoring mobility to people who suffered paralysis. The description additionally lists depression and PTSD among the conditions discussed. These applications follow from precisely timing neuromodulator release so the brain rewires the targeted circuits, which is the mechanism underlying recovery in these cases.

Q: Until what age is the brain most plastic?

Developmental plasticity is highest from birth up to about age 25, which is the commonly cited window during which the brain is described as ultra plastic. After age 25, change becomes much harder but can still be done. Kilgard agrees that while the first six years are critical, there is a long window for plasticity rather than a hard door slamming shut at an early age.

Q: Why does the speaker say the brain is more active than we were taught?

Kilgard says the brain is constantly evaluating trillions of new connections every second, deciding whether to strengthen, weaken, or leave each one the same. This contrasts with the older view that the brain is fixed, dangerous, and best left untouched. He finds that an active, moving brain is more consistent with everyday inner experience, and that the science matching lived experience is one of the most enlightening parts of the research.

Q: How should parents think about childhood learning and neuroplasticity?

Kilgard emphasizes that details matter but no single experience will ruin or define a child, because learning depends on countless hours and experiences. Bedtime stories, songs, walks in the park, and exposure to unpredictable natural patterns all contribute to wiring. Rather than cramming everything into the first six years, parents should set an environment where a child can explore, succeed, and not quit, since children largely train themselves.

Q: Why does it matter that learning takes many thousands of hours?

The 10,000-hours idea to become good at anything is reassuring because a lifetime contains many such blocks of time. Kilgard notes each person knows about 100,000 words without being taught each one directly, and children acquire dextrous finger movements by practicing on their own. This means learning is spread across vast exposure rather than depending on a narrow critical window, relieving pressure on any single early period.

Summary & Key Takeaways

• Dr. Michael Kilgard, a professor at the University of Texas at Dallas and a leading expert on neuroplasticity, explains that the brain's ability to change was long thought limited to childhood, but the adult brain can also be rewired when the right conditions are present.

• Adult rewiring depends on neuromodulators: releasing acetylcholine, norepinephrine, serotonin, or dopamine during learning drives large-scale circuit change. The episode also covers the behavioral requirements for plasticity, including alertness, effortful focus, post-learning reflection, and sleep.

• Kilgard's more recent work uses vagus nerve stimulation to control the timing of neuromodulator release, helping people overcome tinnitus, stroke, depression, PTSD, and paralysis, while childhood plasticity shows that countless everyday experiences, not any single one, shape the developing brain.