
Dopamine When You See Certain People Harmed
Witnessing harm to others triggers dopamine release in the brain, particularly in individuals with high empathy and prosocial tendencies
In this episode, Dr. Andrew Huberman explores the fascinating world of neuroplasticity with Dr. Poppy Crum, examining how our brains fundamentally reshape themselves in response to experience and environmental demands. Crum explains that contrary to old beliefs about fixed neural architecture, the brain maintains extraordinary plasticity throughout our entire lives, allowing us to learn new skills and adapt to changing circumstances at any age. The concept of the homunculus serves as a powerful illustration of this principle. This neurological map shows that brain regions devoted to specific body parts are not fixed but instead expand or contract based on how frequently we use them. Musicians who practice extensively develop larger regions dedicated to their fingers, while people who rely heavily on texting show expanded neural representations for thumb and finger movements. This dynamic reorganization reveals that our daily technology use literally reshapes our brains. The discussion moves into how smartphones and constant texting have altered our neuroplasticity in unexpected ways. Our brains have adapted to process rapid-fire communication and compressed data, but this comes with both benefits and potential costs to other cognitive processes. Crum highlights that understanding these changes helps us make more informed decisions about technology use rather than viewing it as inherently good or bad. The conversation then explores how video games and closed-loop training systems can accelerate learning. When systems provide immediate sensory feedback, they allow our brains to update their internal models more quickly and accurately. This principle applies to learning languages, motor skills, and even understanding complex concepts. Crum explains the role of Bayesian priors in sensory processing, showing how our brains use existing knowledge to interpret new information. By properly designing our environments and learning systems, we can work with rather than against these neural processes. The episode also addresses the future of health technology, including digital twins and AI applications. Crum discusses how these tools can monitor our health status, predict potential issues, and provide personalized recommendations without requiring expensive medical interventions. She emphasizes that many powerful protocols for enhancing learning and health are actually zero-cost or minimal-cost strategies that leverage our understanding of neuroscience. The conversation demonstrates that technology is not something to fear but rather a tool that we can understand and use strategically to enhance our cognitive abilities, learning speed, and overall health. By understanding the principles of neuroplasticity, sensory processing, and environmental design, listeners can optimize both their technology use and their brain function.
“Neuroplasticity is not just about learning new things, it's about how your brain physically reorganizes itself based on what you do most frequently”
“The homunculus shows us that the brain dedicates more real estate to the parts of your body that you use most, and this can change dramatically over months and years”
“Texting has fundamentally altered human neuroplasticity by expanding the brain regions dedicated to our thumbs and fingers in ways that would have been unimaginable a few decades ago”
“Video games and systems with immediate sensory feedback allow your brain to update its internal model of the world much faster than traditional learning methods”
“Understanding how your brain processes sensory information through Bayesian priors allows you to design your environment and learning protocols to work with your neurobiology rather than against it”