Huberman LabBreathing for Mental & Physical Health & Performance | Dr. Jack Feldman
At a glance
WHAT IT’S REALLY ABOUT
How Breathing Shapes Brain Function, Emotion, Health, and Performance Daily
- Andrew Huberman interviews Dr. Jack Feldman, a pioneering neuroscientist who discovered the brainstem circuits that generate our breathing rhythms. Feldman explains how the mechanics of breathing interface with specialized neural oscillators in the brainstem to produce inspiration, passive and active expiration, sighs, and gasps. He details how breathing patterns influence blood gases, pH, heart function, and—critically—brain state, emotion, and cognition via multiple pathways, including the preBötzinger complex, vagus nerve, and olfactory system. The discussion also covers physiological sighs, episodic hypoxia, breathwork for anxiety and fear reduction, and practical protocols Feldman personally uses, framing breathing as a powerful, zero-cost tool for mental and physical performance.
- A major theme is bidirectional control: emotions and higher brain centers shape breathing, but deliberate breathing can in turn reshape emotional state and neural circuits, potentially aiding conditions like anxiety, depression, and age-related cognitive decline. Feldman describes emerging rodent evidence that chronic slow-breathing protocols can reduce fear responses as much as direct amygdala manipulations.
- The episode also highlights the underappreciated breadth of breathing-related modulation across the brain: respiratory rhythms are embedded in cortical and subcortical activity, reaction time, fear perception, cardiac rhythms, even pupil size. Feldman argues that different breath practices likely work by transiently disrupting these brain-wide oscillatory circuits, weakening maladaptive loops and allowing healthier patterns to emerge over time.
IDEAS WORTH REMEMBERING
5 ideasThe preBötzinger complex is the core inspiratory rhythm generator, and a second brainstem oscillator drives active expiration.
Feldman’s lab identified the preBötzinger complex in the brainstem as the small (~thousands of neurons) but essential region that initiates every inspiratory burst. At rest, expiration is passive (elastic recoil), so expiratory motor circuits are silent and were initially missed. Later work revealed a separate expiratory oscillator near the facial nucleus (often termed the parafacial/retrotrapezoid region) that becomes active during behaviors like exercise, forceful exhalation, or gasping. This dual-oscillator architecture underlies flexible breathing patterns for rest, speech, exercise, and emotional expressions (e.g., laughing).
Physiological sighs are vital lung-maintenance breaths occurring roughly every five minutes, not just emotional expressions.
We unconsciously sigh about every 5 minutes—far more often than most people realize. Tiny, fluid-lined alveoli (4–500 million in humans) tend to collapse due to surface tension; normal breaths cannot reliably reopen them. Intermittent large breaths (sighs) pop collapsed alveoli open, preserving lung surface area (~70 m², about a third of a tennis court) for gas exchange. Clinical ventilator data and Feldman’s rat experiments (where peptide manipulation in the preBötzinger complex massively altered sigh rate) show that disrupting sigh generation leads to deteriorating lung function and can be fatal.
Breathing is deeply intertwined with emotion and cognition via multiple ascending and descending pathways.
Emotion and volition shape breathing (e.g., stress, laughter, speech) via descending inputs from structures like the amygdala and motor cortex. Conversely, breathing impacts brain state through: (1) direct preBötzinger projections to the locus coeruleus (a noradrenergic arousal hub, as shown by Yakel et al.), (2) rhythmic sensory input from nasal airflow into the olfactory bulb and onward, (3) vagus nerve feedback from lungs and viscera, and (4) CO₂/pH-dependent modulation of chemosensitive brain regions. Feldman highlights that lesions causing locked-in syndrome abolish voluntary control of breathing but preserve emotion-driven breathing changes (e.g., laughter), showing distinct neural routes.
Slow, controlled breathing can measurably reduce fear and anxiety by disrupting maladaptive neural oscillations.
Feldman’s group developed a protocol that slowed awake mice’s breathing rate by ~10x for 30 minutes/day over four weeks. Compared to controls, these mice showed dramatically reduced freezing in standard fear-conditioning tests—effects comparable to direct amygdala manipulations (per collaborator Michael Fanselow). Feldman hypothesizes that breathwork perturbs ongoing oscillatory circuits underlying mood/fear, weakening pathological loops (similar in principle to ECT or deep brain stimulation, but milder and behaviorally induced). Even single deep breaths or short box-breathing sessions can acutely calm nervousness before stressful events.
CO₂ levels and episodic hypoxia strongly shape breathing and may enhance motor and cognitive performance.
Breathing tightly regulates CO₂, which strongly influences blood/brain pH and drive to breathe. Chronic low CO₂ from hyperventilation is linked to anxiety; therapeutic training to normalize CO₂ (via slower breathing) reduces anxiety in clinical work (e.g., Alicia Meuret’s studies). Separately, “episodic hypoxia” (brief, repeated exposures to low oxygen with normal CO₂) in humans leads to lasting increases in ventilation and can improve motor output—e.g., stroke patients showing stronger ankle extension after hypoxic bouts (Gordon Mitchell’s work). Feldman notes this may someday be harnessed for rehab, athletic performance, or cognitive enhancement, though safe dosing and protocols are still under investigation.
WORDS WORTH SAVING
5 quotesBreathing is one of those oscillators that, for life, has to be working continuously, 24/7… if it stops, beyond a few minutes it will likely be fatal.
— Dr. Jack Feldman
We sigh about every five minutes… and you can’t stop it. It just happens.
— Dr. Jack Feldman
My mice don’t believe in the placebo effect.
— Dr. Jack Feldman
You can’t do anything interesting if you’re afraid of failing.
— Dr. Jack Feldman
I think there’s a lot of value to human health here, and I just hope we can get serious neuroscientists and psychologists to do the right experiments.
— Dr. Jack Feldman
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