Enhance Your Learning Speed & Health Using Neuroscience Based Protocols | Dr. Poppy Crum

Huberman and former grad-school classmate Poppy Crum discuss how every technology we use reshapes our brains through neuroplasticity, from texting to video games. They dig into using AI as a tool that can make us cognitively sharper (self-testing, custom computer-vision apps) versus one that erodes 'germane cognitive load' and learning. A large portion covers 'digital twins' and ambient sensors (CO2, pupillometry, voice, posture) that could measure and modify our waking states the way smart mattresses optimize sleep. Crum also shares her own story of perfect/absolute pitch and how studying owls, bats, moths, crickets, marmosets, and spiders reveals how brains adapt under pressure. The episode closes on self-directed plasticity: we can change fast if the incentives are high enough.

• Crum can walk into a hotel room and be forced to move because of a pitch she hears, due to her absolute pitch.
  00:11:01
• 40 hours of Call of Duty permanently improves a non-gamer's contrast sensitivity and it persists a year later.
  00:37:25
• A recent MIT EEG study showed using LLMs to write papers reduces 'germane cognitive load' and real learning.
  00:55:32
• Huberman says he gets close to two hours of REM sleep a night using his Eight Sleep mattress.
  01:07:27
• At Dolby, Crum measured audiences' CO2 to detect exactly when Alex Honnold summited or hurt his ankle in Free Solo.
  01:17:46
• AI voice analysis can flag neural degeneration like Alzheimer's up to 10 years before clinical symptoms appear.
  01:56:33
• Crum developed a second absolute-pitch map at A415 from Baroque violin, paralleling Knudsen's prism-shifted owls.
  02:08:11
• Orb-weaver spiders tune their webs like a violin and react to ~880 Hz, using the web as a sound-detection instrument.
  02:22:47

• You can roughly predict where someone lives by their hearing thresholds, because cities have unique sonic imprints.
  00:08:25
• Texting acronyms like 'LOL' act as lossy compression that triggers a much richer internal experience.
  00:23:54
• London taxi drivers had more hippocampal gray matter from mental maps; GPS made that adaptation unnecessary.
  00:54:00
• Cognitive load splits into intrinsic (material difficulty), extraneous (presentation/environment), and germane (building mental schemas).
  00:57:38
• CO2 is heavier than air, so audience stress can be tracked from tubes on the floor reading exhaled breath.
  01:17:46
• Earbuds can detect heart rate, blood oxygen, eye movements (EOG), and even attention from in-ear signatures.
  01:28:36
• Diabetes (dehydration) and heart disease both produce detectable changes in the spectrum of the human voice.
  01:58:41
• Echolocating bats subtly shift their call frequency so echoes return in their most sensitive hearing range.
  02:14:56
• A moth escapes a bat about 80% of the time using random flight, dropping to the ground, and body 'metareflectors'.
  02:17:32
• Crickets have one neuron with peaks at 6kHz and 40kHz that trigger opposite approach/flee behaviors.
  02:27:02

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