Life, Death & the Neuroscience of Your Unique Experience | Dr. David Linden
Dr. David Linden, a neuroscience professor at Johns Hopkins University and author, shares insights on how unique life experiences shape our individual perceptions. He discusses neuroplasticity and the mind-body connection, highlighting how mental practices like meditation can influence health. Linden candidly reflects on his terminal illness, revealing lessons on gratitude and the perception of time. The conversation also touches on the complexities of sensory experiences and the impact of early life on physiological traits, blending science with personal narrative.
Top snips
The nerve endings of sexual touch
9:00 – 13:04
Krause corpuscles — first described in 1860 — were finally characterized in mice by David Ginty's lab. They:
- are mechanical sensors in genitals, nipples, lips
- when activated can trigger erection in male mice
- when silenced reduce sexual behavior
This opens questions about aging, experience-dependent change, and individual differences in sexual sensation.
Why smell makes us totally unique
22:52 – 26:07
Humans have ~400 odor receptors — and ~30% differ between two random people. That explains why one person smells Parmesan and another smells vomit (butyric/isovaleric acids).
- genetics → some odors undetectable for some
- culture & learning reshape odor meaning
Perception = inference, not pure reality.
Nature, nurture — and chance
43:13 – 46:30
Most traits sit between 0–100% heritable. Examples:
- Earwax: 100% linked to ABCC11 gene.
- Speech accent: 0% (learned from peers).
- Height in US: ~85%, but only ~50% where nutrition/disease limit growth.
Plus: stochastic development creates large individual differences even in identical twins.
Cerebellum = prediction engine
1:20:33 – 1:23:19
Beyond balance and coordination, the cerebellum's core operation is predicting the immediate future — milliseconds to seconds — to guide action and timing.
- Helps motor skills (sports, instrument playing)
- Extends to cognition and social prediction via thalamus→frontal cortex pathways
Modern view: a general-purpose predictive computation applied across domains.
Inflammation, microglia & depression
1:38:33 – 1:43:34
Mind↔body signals travel via neurons and diffusible molecules (cytokines). Inflammation links to depression:
- cytokines (e.g., IL-6, IL-17) affect brain development/function
- microglia (brain immune cells) prune synapses and respond to cytokines
- hypothesis: inflammation may block neuroplasticity, explaining varied antidepressant responses
Facing death: curiosity, time, gratitude
2:08:24 – 2:19:50
David Linden shares his heart-cancer journey (synovial sarcoma). He felt anger and deep gratitude at once, and noticed time perception shift — life's big things gain clarity.
Heart cancer. Who the hell gets heart cancer?
— David Linden
Curiosity became agency; gratitude centered on relationships and meaning.