
Inner Cosmos with David Eagleman Ep125 "Why do brains need friends?" (with Ben Rein)
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Oct 13, 2025 Ben Rein, a neuroscientist and author of 'Why Brains Need Friends,' dives into the fascinating world of social neuroscience. He explains why human brains crave social interaction and how isolation can trigger stress responses. The duo discusses the evolutionary roots of our need for connections and the cognitive benefits of socializing, such as building brain reserve. Rein also critiques AI chatbots as substitutes for real human interaction, addresses social media's detrimental effects on mood, and highlights the bonding power of dogs.
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Social Connection As Biological Fuel
- Brains evolved to treat social connection as biological fuel that supports growth and resilience.
- Chronic loneliness triggers stress and damages health similarly to physical risks like smoking.
Rebuild Your Social Schedule
- Recognize the post-interaction shift in expectations since COVID and remote work.
- Rebuild a social schedule toward more frequent interactions to meet unchanged biological needs.
Other People Strengthen The Brain
- Socializing exercises complex cognitive systems and can increase gray matter and cognitive reserve.
- Other people create novel challenges that drive neural plasticity more than solitary tasks.




