Episode Details

Your body is running 50,000 sensors right now that you've never consciously noticed. Proprioception—the sense of where your body is in space—has been known for 200 years, yet we still teach kids they only have five senses. Host A and Host B explore the invisible network that lets you touch your nose with your eyes closed, the history of how scientists finally understood this mysterious sense, and why one researcher won a Nobel Prize for finding the missing piece. 0:00 - The Nose Touch Experiment: An impossible party trick 2:30 - What is Proprioception?: Defining your hidden sixth sense 5:15 - The 50,000 Sensor Network: Your body's neural highways 8:00 - A 200-Year-Old Secret: Charles Bell and the forgotten sense 11:00 - The Missing Link: From Sherrington to the 2021 Nobel Prize 15:30 - Why This Matters: Living with an invisible superpower --- Sources & further reading: • Jonathan Cole — Pride and a Daily Marathon (MIT Press): https://mitpress.mit.edu/9780262531368/pride-and-a-daily-marathon/ • Oliver Sacks — The Man Who Mistook His Wife for a Hat (1985) — (book) • Ardem Patapoutian et al. — Nobel Prize in Physiology or Medicine 2021, discovery of PIEZO2: https://www.nobelprize.org/prizes/medicine/2021/press-release/ • Charles Bell — "On the Nervous Circle which connects the Voluntary Muscles with the Brain" (1826, Royal Society) • Charles Scott Sherrington — The Integrative Action of the Nervous System (1906) — (book) • Sumire Kawashima & Yuzuru Ikeda — Octopus rubber arm illusion study (2025): https://www.science.org/content/article/octopuses-fall-rubber-arm-illusion-just-us • Physoc — "Charles Bell's sixth sense": https://www.physoc.org/magazine-articles/charles-bells-sixth-sense/ • Nature — "Proprioceptive potential of joint receptors" (2025): https://www.nature.com/articles/s41598-025-27311-3 • Hugh Herr / MIT Media Lab — AMI prosthetic research: https://www.media.mit.edu/projects/agonist-antagonist-myoneural-interface-ami/press-kit/ • Boyuan Chen & Hod Lipson / Columbia Engineering — Robot self-model via proprioception: https://www.engineering.columbia.edu/about/news/robot-learns-imagine-itself • Frontiers in Human Neuroscience — "Aging and Proprioceptive Error" (2023): https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2023.1217105/full • PMC — Proprioceptive Training Systematic Review (2024): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11225257/ • Frontiers — Motor Performance and Proprioceptive Training Review: https://www.frontiersin.org/journals/rehabilitation-sciences/articles/10.3389/fresc.2022.830166/full • PMC — Microgravity and Proprioception: https://pmc.ncbi.nlm.nih.gov/articles/PMC9650717/ • PMC — Proprioceptive Countermeasures for Spaceflight: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8111171/ • V.S. Ramachandran — Mirror box therapy / phantom limb research — (multiple publications) • PubMed — "Phantom Limb Pain and Proprioceptive Memory": https://pubmed.ncbi.nlm.nih.gov/19556069/ • Science and Culture Today — "Interoception Is a Match for Proprioception" (2026): https://scienceandculture.com/2026/07/design-concepts-interoception-is-a-match-for-proprioception/ • Science of Falling — "How Alcohol Affects Balance": https://scienceoffalling.com/articles/how-alcohol-affects-balance-the-connection-between-drinking-dizziness-and-falling • The Conversation — "Proprioception: our imperceptible 6th sense": https://theconversation.com/proprioception-our-imperceptible-6th-sense-150775 • JOSPT — ACL Proprioception Deficits: https://www.jospt.org/doi/10.2519/jospt.1999.29.10.587 • PMC — Bodily Awareness and Interoception debate: https://pmc.ncbi.nlm.nih.gov/articles/PMC11048399/ • …and 1 more in the episode research notes This podcast episode was fully generated by AI — research, script, voices, and production. Built with Claude, Piper TTS, and automated pipeline tooling.