In this episode my guest is Dr. Jack Feldman, Distinguished Professor of Neurobiology at the University of California, Los Angeles and a pioneering world expert in the science of respiration (breathing). We discuss how and why humans breathe the way we do, the function of the diaphragm and how it serves to increase oxygenation of the brain and body. We also explore how breathing influences mental state, fear, memory, reaction time and more. Additionally, we cover specific breathing protocols such as box breathing, cyclic hyperventilation (similar to Wim Hof breathing), nasal versus mouth breathing, unilateral breathing and how each of these affects the brain and body. We examine physiological sighs, peptides expressed by specific neurons controlling breathing and magnesium compounds that can improve cognitive ability and how they work. This conversation serves as a sort of master class on the science of breathing and breathing-related tools for health and performance. For an up-to-date list of our current sponsors, please visit our website: https://www.hubermanlab.com/sponsors. Previous sponsors mentioned in this podcast episode may no longer be affiliated with us. Our Breath Collective: https://www.ourbreathcollective.com/huberman Dr. Jack Feldman Links: UCLA website - https://bioscience.ucla.edu/people/jack-feldman Wikipedia - https://en.wikipedia.org/wiki/Jack_L._Feldman Twitter - https://twitter.com/prebotzinger Instagram - https://www.instagram.com/jacklfeldman Social: Instagram - https://www.instagram.com/hubermanlab Twitter - https://twitter.com/hubermanlab Facebook - https://www.facebook.com/hubermanlab Website - https://hubermanlab.com Newsletter - https://hubermanlab.com/neural-network Please note that The Huberman Lab Podcast is distinct from Dr. Huberman's teaching and research roles at Stanford University School of Medicine. The information provided in this show is not medical advice, nor should it be taken or applied as a replacement for medical advice. The Huberman Lab Podcast, its employees, guests and affiliates assume no liability for the application of the information discussed.