Life, Death & the Neuroscience of Your Unique Experience | Dr. David Linden

Andrew Huberman and David Linden range across the neuroscience of sexual sensation, the sources of human individuality, and the cerebellum's role in predicting the near future. Linden argues that perception is inference shaped by genes, experience, and the random (stochastic) nature of development, reframing nature-vs-nurture as 'heritability interacting with experience filtered through the randomness of development.' They explore mind-body medicine, inflammation and depression, neuroplasticity, and how neurons can even influence cancer progression. The final third turns deeply personal as Linden discusses his 2020 heart cancer diagnosis, a 6-to-18-month prognosis he has outlived, and what facing death has taught him about time, gratitude, and the human inability to imagine our own absence.

• A preprint from David Ginty's Harvard lab finally identifies the Krause corpuscles as the nerve endings responsible for sexual sensation, solving a mystery open since 1860.
  00:10:22
• People given the identical vial of butyric acid will swear it smells like parmesan or like vomit depending only on what they were told it was, even after being told it was the same sample.
  00:25:05
• The Minnesota study of twins reared apart found that family upbringing has almost nothing to do with the 'OCEAN' personality traits.
  00:53:33
• Linden frames the cerebellum's core job as predicting the immediate future, a computation that extends from motor control to reading whether people are friend or foe.
  01:21:30
• Neurons innervating melanomas release CGRP that suppresses immune patrolling, raising the speculative possibility that mental states could influence tumor progression via a defined biological pathway.
  01:57:42
• Linden reveals his oncologist gave him 6 to 18 months to live about 27 months before recording; he has outlived the prognosis.
  02:13:30
• He describes feeling 'white hot angry with the universe' and a deep sense of gratitude in the very same moment, realizing emotional states are not a single axis.
  02:14:32
• Linden hypothesizes that worldwide afterlife and reincarnation beliefs are a side effect of the brain being unable to stop predicting a future that includes us.
  02:23:35

• In mice, shining blue light on optogenetically modified Krause corpuscles gives a male mouse an erection; silencing them reduces mounting and receptivity.
  00:11:57
• Any two people, on average, have functional differences in about 30% of their roughly 400 odor receptors.
  00:22:58
• Newborn babies find rotting-meat smells (cadaverine, putrescine) aversive innately but must learn culturally that their own poop is disgusting.
  00:27:10
• Children who don't spend time outdoors in their first five years are far more likely to become myopic, because light affects eyeball elongation via trophic factors.
  00:33:32
• WWII Japanese soldiers from the cold north suffered more heat stroke; sweat-gland innervation is set by early-life climate experience, not genes, and can flip in one generation.
  00:35:38
• Wet versus dry earwax is 100% heritable (gene ABCC11), while speech accent is 0% heritable and set by peers, not parents.
  00:43:02
• Newborn identical twins can differ markedly in organ size (one twin's spleen 30% larger) due to the stochastic nature of development.
  00:57:18
• Males in utero during the 1918 flu pandemic ran roughly fourfold higher rates of schizophrenia, traced in mice by Gloria Choy to maternal interleukin-17 crossing the placenta.
  01:08:18
• Only about a third of depressed people see significant benefit from SSRIs, suggesting 'depression' is many distinct biological disorders.
  01:39:50
• Total sleep deprivation can kill you via sepsis, as the barrier between gut contents and the body breaks down.
  02:05:36

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