The 'Religious Order Study' found that nuns with the physical brain pathology of Alzheimer's often showed no cognitive symptoms. Their highly social and mentally engaging lives built up a 'cognitive reserve' of new neural pathways that compensated for the degenerating tissue.
To build cognitive reserve and fight decline, you must constantly force your brain to create new pathways. This requires seeking challenges that are 'frustrating but achievable.' Crucially, once you become an expert at something, you should drop it and tackle a new skill you are bad at.
A framework for AI use: delegate 'vicious friction' (tedious tasks like data entry) but retain 'virtuous friction' (challenging problems that require deep thought). Outsourcing the latter prevents the cognitive struggle necessary for learning, expertise, and building new neural pathways.
Internal conflict is not a flaw; it's your brain operating as designed. It's a 'team of rivals' or a 'neural parliament' with competing networks. Understanding this allows you to manage impulses by creating a 'Ulysses contract'—a pre-commitment that constrains your future self's bad behavior.
Humans subconsciously assign greater value to things perceived as requiring significant effort. This 'effort phenomenon' explains why a natural diamond is prized over an identical lab-grown one, and why low-effort, AI-generated content can feel irritating and valueless to consumers.
Creativity is simply remixing existing concepts, a task at which AI excels. Its current primary limitation is in selection. AI can generate a thousand options but doesn't know which one will best appeal to human taste, which requires a uniquely human ability to balance novelty and familiarity.
During sleep, your brain runs visual simulations (dreams) to protect the visual cortex from being repurposed by other senses like hearing and touch. This is an evolutionary defense against the sensory deprivation that occurs during nightly darkness, preventing takeover from more active senses.
The brain doesn't just grow; it refines. It reaches maximum neural connections around age two, becoming like an overgrown garden. Subsequent development is a process of 'pruning' these connections to become more efficient and specialized for its specific environment, shifting from fluid to crystallized intelligence.
When learning a new skill, a novice's brain is 'on fire with activity,' burning significant energy to figure out the rules. An expert's brain, by contrast, is much less active. The brain’s goal is to automate skills by burning them into deep circuitry, thereby conserving energy.
Contrary to common fears, the internet likely enhances intelligence in children by providing a vast 'intellectual diet.' The ability to instantly get answers when curious facilitates 'just-in-time' learning, which is neurologically more effective for knowledge retention than the 'just-in-case' model of traditional schooling.
To get maximum intellectual value from AI, explicitly instruct it to challenge you. Using prompts like 'Tell me why I'm wrong' or 'Identify my blind spots' transforms AI from a sycophantic assistant into a powerful tool for stress-testing ideas and overcoming cognitive dissonance.
People vary dramatically in their ability to form mental images, from none (aphantasia) to vivid (hyperphantasia). Surprisingly, this has no bearing on real-world capability, even in visual fields. Top Pixar animators, for example, are often aphantasic, proving the brain can use non-visual pathways to solve visual problems.