In this video, neurobiologist Professor Andrew Huberman explains the biological mechanisms of how meditation affects the brain and body, and guides viewers on how to find the most effective meditation practice for each individual. Going beyond simply "sitting with your eyes closed," it covers the specific scientific principles of balancing interoception (internal sensory awareness) and exteroception (external sensory awareness) to enhance brain plasticity. It also provides practical protocols on how to vary breathing techniques and meditation styles depending on your goals — whether that's enhancing focus, improving sleep, or shifting mood.

1. The Biological Foundations of Meditation: What Happens in the Brain?

When people think of meditation, they often picture sitting in lotus position, focusing on the "Third Eye." But scientifically, meditation is a process of training the interactions between specific brain regions — particularly the prefrontal cortex, the anterior cingulate cortex (ACC), and the insula. These three areas interpret our body's internal sensations (heart rate, breathing, gut feelings, etc.) and determine whether they align appropriately with external circumstances.

Professor Huberman explains that the commonly referenced "Third Eye" location actually corresponds to the prefrontal cortex. Interestingly, the brain itself has no sensory nerves.

When you close your eyes and focus your attention on the "Third Eye" center just behind your forehead, you're essentially directing your perception to a location where no sensation exists. When you focus on a place with no sensation, thoughts, emotions, and memories that were previously buried under sensory input begin to gush up like a geyser.

In other words, random thoughts or emotions surging during meditation isn't failure — it's the brain's natural response when sensory input is blocked.

2. Assessing Your State: Interoception vs. Exteroception

The first thing to do before starting meditation is to determine whether your current state leans more toward interoception or exteroception.

• Interoception: Sensations felt inside your body — heartbeat, breathing, gut feelings, etc. Closing your eyes naturally activates these sensations.
• Exteroception: Sensations about the world outside your body — vision, hearing, etc.

Research shows that people spend nearly half their waking hours in "mind wandering," which is associated with unhappiness. To address this, we need to train ourselves to focus on the present.

A human mind is a wandering mind, and a wandering mind is an unhappy mind. The ability to think about things that aren't happening in the present moment may be a cognitive achievement, but it comes with an emotional cost.

Therefore, the core of meditation is identifying where you're currently skewed and practicing toward balance. If you're highly anxious and overly sensitive to subtle changes in your body (interoceptive excess), meditation with eyes open focused on external objects will actually help. Conversely, if you're too scattered and swept up by external stimuli, you need an interoceptive meditation with eyes closed, focusing on breathing.

3. Meditation for Brain Plasticity: Do the Opposite of What's Comfortable

Neuroplasticity — the brain's ability to change — doesn't occur when doing easy things, but when experiencing difficulty and discomfort. Professor Huberman recommends meditating in the opposite direction of your comfortable state.

• When trapped in your own thoughts: Gaze at a specific external point (a tree, a spot on the wall, etc.) and practice exteroceptive meditation.
• When your surroundings are too distracting: Close your eyes and practice interoceptive meditation focused on breathing or inner sensations.

Many people blame themselves when their mind wanders during meditation, thinking "I'm bad at meditation," but the reality is the opposite.

The moment your mind drifts away and then comes back — that's exactly when the neural circuits are being strengthened. Rather than maintaining focus, the process of losing focus and then refocusing is the core of the training.

4. The Science of Breathing: A Remote Control for Your Mood

In meditation, breathing is inseparable from practice. Simply adjusting breathing patterns can arouse or relax the brain. The principle is quite simple.

1. When you need alertness and focus: Make your inhales longer and stronger than your exhales. (e.g., Wim Hof breathing, cyclic hyperventilation)
2. When you need relaxation and calm: Make your exhales longer than your inhales. (Parasympathetic nervous system activation)
3. When you want balance: Make inhale and exhale duration equal, or practice "Box Breathing."

When starting meditation, ask yourself: "Do I want to be calmer than I am now, or more alert?" The answer to this question determines your breathing technique.

5. Meditation, Sleep, and Dissociation

Many people meditate to address sleep deprivation, but traditional focused meditation can actually arouse the brain and interfere with sleep. If sleep is the goal, NSDR (Non-Sleep Deep Rest) or Yoga Nidra are far more effective than meditation.

• Meditation: A process of focusing and training the brain (may have arousing effects).
• NSDR / Yoga Nidra: A process of releasing focus and entering deep relaxation (sleep-replacement effect, dopamine recovery).

From a mental health perspective, the balance between dissociation and interoception is also important. Dissociation refers to a state where sensations are blocked or you feel numb. People who are overly sensitive need some degree of dissociation (distancing), while those who are too numb need to awaken their interoceptive senses. A healthy mental state means flexibly moving within the U-shaped curve between these two extremes.

6. Space-Time Bridging (STB) Meditation

Finally, Professor Huberman introduces a meditation method called Space-Time Bridging (STB) that integrates all of these principles. It's a practice that adjusts visual focus to change how the brain perceives time and builds flexibility.

[STB Meditation Method]

1. Eyes closed (internal): For 3 breaths, focus solely on your breathing or the Third Eye.
2. Palm (near distance): Open your eyes and extend your arm to look at your palm. Focus on both your palm and breathing for 3 breaths.
3. Medium distance: Look at an object 3-5 meters away and take 3 breaths.
4. Far distance: Look at a very distant horizon or landscape and take 3 breaths.
5. Cosmic perspective: Recognize that you are a small dot on a massive planet called Earth, and that Earth is floating in space, while taking 3 breaths.
6. Back to internal: Close your eyes and return to inner sensations.

The closer you focus, the more finely the brain slices time (like slow motion). Conversely, the farther you look, the larger the units of time the brain perceives. This practice builds the ability to flexibly regulate attention while moving across space and time.

Conclusion

Meditation isn't simply about emptying the mind — it's active training that rewires the brain's circuits. What matters most is consistency. Even 1 minute a day is fine, as long as you do it consistently.

• Key Takeaways:
  • Assess whether you're skewed inward or scattered outward.
  • Practice the opposite of your default tendency to balance the brain.
  • Emphasize inhales for alertness, exhales for relaxation.
  • When you need sleep or deep rest, do NSDR (Yoga Nidra) instead of meditation.

As of 2025, tens of thousands of studies have validated the effects of meditation. Why not start a "scientific" meditation practice tailored to you today?