How Meditation Works & Science-Based Effective Meditations
Summary
This episode explores the neuroscience of meditation, detailing which brain areas activate or deactivate during different meditation types and how these changes produce lasting benefits beyond the meditation session itself. Andrew Huberman explains the key distinction between state changes (temporary shifts during meditation) and trait changes (lasting neurological rewiring), and provides a framework for selecting the optimal meditation practice based on your current mental state. The core insight is that meditation is most effective when it works against your default perceptual tendencies.
Key Takeaways
- Mind-wandering causes unhappiness — A landmark study (A Wandering Mind is an Unhappy Mind, Killingsworth & Gilbert, 2010) found that people are less happy when their minds wander, regardless of the activity — even if they’re thinking pleasant thoughts.
- Choose your meditation based on your current state — Before meditating, assess whether you are more interoceptively or exteroceptively dominant in that moment, then choose the opposite type of meditation.
- Meditation works by refocusing, not sustained focus — Expert meditators aren’t better at holding attention; they re-enter focus faster. Every time your mind wanders and you bring it back, that is the training.
- Even 3–5 minutes daily produces measurable benefits — Short, consistent sessions are effective. Three minutes is a practical starting point with documented benefits for focus and anxiety management.
- As you improve, you need less time — Unlike physical endurance training, better meditators can achieve the same brain states more quickly and require less total meditation time.
- Interoceptive awareness isn’t always beneficial — Excessive focus on internal body signals can worsen anxiety. Balance between interoception and exteroception is the goal, not maximizing one.
- Meditation changes both states and traits — Consistent practice shifts your neurological default, not just your moment-to-moment experience.
- The discomfort of refocusing is the signal for neuroplasticity — Difficulty during meditation means your brain circuits are being challenged and changed.
Detailed Notes
The Core Brain Areas Involved in Meditation
Three key brain structures form the neural foundation of meditative states:
- Left Dorsolateral Prefrontal Cortex (LDLPFC) — Located just behind and slightly above the left temple. Interprets emotional and bodily signals and enables good decision-making based on those signals. Acts as the primary “interpreter” and controller of attention during meditation.
- Anterior Cingulate Cortex (ACC) — Receives input from the heart, gut, lungs, and threat-detection areas (including the amygdala). Determines whether bodily sensations are appropriate for the current context (e.g., fast heartbeat while running = normal; fast heartbeat while sitting calmly = alarming).
- Insula — Integrates both internal (interoceptive) and external (exteroceptive) information. Works alongside the ACC to build a coherent picture of internal state vs. external environment.
These three structures are in constant communication, collectively determining how you feel, whether those feelings match your circumstances, and what actions you should take.
Interoception vs. Exteroception: The Core Continuum
Interoception refers to perception of sensations at or within the skin — heartbeat, gut fullness, breathing sensations, temperature, pain, and pleasure.
Exteroception refers to perception of everything outside the skin — sights, sounds, and external environment.
Key facts:
- Closing your eyes dramatically shifts your perception toward interoception because vision occupies 40%+ of brain processing.
- Most people default to a mix of both, but individuals vary in their natural bias.
- High interoceptive awareness can worsen anxiety (e.g., over-sensitivity to heart rate or breathing changes).
- Low interoceptive awareness can cause people to miss important health signals (e.g., ignoring symptoms of high blood pressure or cardiac events).
- The goal of meditation is not to maximize interoception, but to develop flexible control over where you place your attention on this continuum.
Self-assessment test: Sit or lie down, close your eyes, and notice whether your attention naturally drifts inward (toward body sensations) or outward (toward sounds, environment). This tells you your current default state.
Heartbeat detection test: Without touching your pulse, try to count your own heartbeats. Accuracy reflects your current level of interoceptive awareness.
The Default Mode Network and Mind Wandering
The default mode network (DMN) is a set of brain areas that activate during rest and mind-wandering. It generates thoughts about the past, present, and future — what researchers call stimulus-independent thought.
The Killingsworth & Gilbert (2010) study — “A Wandering Mind is an Unhappy Mind” (published in Science):
- Sampled 2,250+ adults via smartphone throughout the day
- Found minds wandered in nearly 50% of moments, across almost all activities (except sex)
- People reported being less happy when their mind wandered, even when thinking pleasant thoughts
- What people were thinking was a better predictor of happiness than what they were doing
- Conclusion: “The ability to think about what is not happening is a cognitive achievement that comes at an emotional cost.”
Meditation directly counteracts the DMN by anchoring attention to either internal or external stimuli, reducing aimless time-travel between past, present, and future.
How to Choose the Right Meditation for You
Step 1: Assess your current state
- Close your eyes and notice: are you easily drawn inward (interoceptive) or pulled outward (exteroceptive)?
Step 2: Choose the opposite
- If you’re naturally drawn inward → do an exteroceptive meditation (eyes open, focused on an external point)
- If you’re naturally pulled outward → do an interoceptive meditation (eyes closed, focused on breath or third eye center)
Why choose the opposite? The friction of working against your default state is what drives neuroplasticity. If something is easy, there is no signal for your brain to change.
Interoceptive Meditation (Eyes-Closed Practice)
Protocol:
- Sit or lie down in a comfortable position
- Close your eyes
- Focus attention on the area behind your forehead (the “third eye center,” which corresponds anatomically to the prefrontal cortex) OR on your breathing (movement of belly, chest, or diaphragm)
- When your mind wanders, notice it and return your focus — each return is the training
- Duration: 3–13 minutes daily is effective; even 1–3 minutes has documented benefits
Best for: People who are currently distracted by the external environment; building interoceptive awareness; improving sleep; managing mood.
Exteroceptive Meditation (Eyes-Open Practice)
Protocol:
- Sit in a comfortable position with eyes open
- Choose a focal point outside your body — a point on the wall, a plant, a spot on the horizon
- Anchor your visual attention there
- Blinking and occasional eye movement are completely normal and expected
- When attention drifts internally, redirect it back to the external focal point
- Duration: Same as above, 3+ minutes
Best for: People who are overly “in their head,” experiencing looping or obsessive thoughts, or who have high baseline interoceptive awareness and/or anxiety.
The Refocusing Principle
A study in Japan compared novice and expert meditators listening to 20 repeated tones:
- Expert meditators attended to all 20 tones; novices habituated and drifted by tone 10–11
- Modern neuroimaging revealed this wasn’t due to sustained, unbroken focus — expert meditators were exiting focus and re-entering it faster
Practical implication: Stop evaluating your meditation by how long you can hold focus. Instead, count each refocusing moment as a rep. More wandering + more returning = more training stimulus = more neuroplasticity.
State Changes vs. Trait Changes
- State changes: Temporary shifts in brain activity during a meditation session (calmer, more focused, less anxious in the moment)
- Trait changes: Lasting shifts in your neurological default — who you are between meditation sessions
The book Altered Traits by Daniel Goleman and Richard Davidson