Breathing for Mental & Physical Health & Performance | Dr. Jack Feldman
Dr. Jack Feldman, a distinguished neurobiologist at UCLA and breathing expert, shares fascinating insights into respiration. He explores how breathing affects mental states like fear and memory, and discusses diverse techniques, including box-breathing and cyclic hyperventilation. Feldman highlights the brain regions controlling breathing and the physiological significance of sighs. Listeners learn about the impact of nostril usage on emotional responses and how practices such as breathwork can enhance cognitive and physical performance. This informative conversation serves as a masterclass in the power of breath.
Top snips
Where Rhythm of Breath Begins
10:14 – 14:18
Breathing rhythm originates in a tiny brainstem region called the pre‑Bötzinger complex — a few thousand neurons that start every inhale.
It drives motor neurons to the diaphragm and intercostals, then stops, allowing passive exhale. This single oscillator is essential for continuous, life‑long breathing control.
Every breath begins with neurons in this region beginning to be active.
— Jack Feldman
Diaphragm, Alveoli & the Power of a Sigh
25:21 – 40:48
The diaphragm gives mammals huge mechanical advantage — expanding a ~70 m² lung surface with small motion. Tiny alveoli tend to collapse; deep breaths periodically pop them open.
We sigh about every five minutes. This physiological sigh preserves lung surface and overall lung health.
We sigh about every five minutes.
— Jack Feldman
Two Oscillators: Inhale vs Active Exhale
18:41 – 20:37
Pre‑Bötzinger handles inspiration. A second oscillator (parafacial/retrotrapezoid area) is silent at rest but drives active expiration during exercise or forceful exhale.
Mammals evolved a diaphragm‑centric system; reptiles/amphibians use different mechanics (active exhale, passive inhale).
Breath Changes the Brain: Meditating Mice Study
1:03:42 – 1:05:58
Feldman trained mice to breathe 10x slower for 30 min/day ×4 weeks. Result: dramatically reduced fear (less freezing after shock), comparable to major amygdala manipulations.
Key point: breath practice can causally alter neural circuits — mice don't have placebo effects.
Nose vs Mouth: Smell, Memory & Brain Oscillations
1:20:43 – 1:41:08
Nasal breathing adds respiratory‑modulated input from the olfactory bulb to many brain regions. Studies show better memory encoding with nasal vs mouth breathing — likely via olfactory and central respiratory signals riding brain oscillations.
This makes nasal breathing especially relevant during learning.
Practical Breathwork: Box Breathing → Variable Practice
1:57:10 – 1:59:48
Feldman recommends simple, short sessions first: box breathing (e.g., 5s inhale → 5s hold → 5s exhale → 5s hold) for 5–20 minutes to reset focus.
He also suggests deliberately variable routines (change tempo/depth) to disrupt habitual circuits — a practical way to train state control.
Magnesium Threonate: Memory & Plasticity Support
2:06:00 – 2:13:45
Lab work found higher extracellular Mg2+ lowers neuronal 'noise' and boosts LTP (plasticity). Magnesium threonate crosses into brain more effectively.
A placebo‑controlled trial in mild cognitive decline showed cognitive age improvements (~8 years vs ~2 years placebo) after supplementation in that study cohort.