A neuroscientist’s guide to protecting your brain, in 58 minutes | Lisa Genova: Full Interview
Big Think · 58:45 · 3 weeks ago
Occasional forgetfulness is a natural function of a healthy human brain, not a sign of disease. While Alzheimer's is a serious condition, most everyday memory lapses—like losing keys or forgetting a name—are normal results of distraction or how the brain prioritizes information. You can actively protect your brain health and strengthen your memory through daily lifestyle habits that reduce disease risk and build "cognitive reserve," which helps the brain function even if some pathways are blocked.
- Normal vs. Alzheimer’s — Forgetting things like where you parked is usually a normal failure of attention, whereas forgetting what your car is or how you arrived at a location are potential warning signs .
- How memory works — Memories are not stored in one "file cabinet" in the brain; they are neural circuits spread across different regions that the hippocampus weaves together .
- The memory cycle — Creating a memory involves four distinct stages:
- Encoding — Translating experiences into neural language .
- Consolidation — Linking new, unrelated neural activity into a stable circuit .
- Storage — Making lasting changes in the brain’s architecture .
- Retrieval — Activating the circuit to recall information .
- Why we forget — The brain is designed to remember what is emotional, meaningful, or repeated, and it naturally discards routine "same old" information to prevent overload .
- Attention barriers — Misplacing items occurs because you never formed a memory of where you put them, as your brain was distracted at the time .
- Techniques for recall — You can boost memory performance using several strategies:
- Spaced repetition — Spreading study sessions over time is superior to "cramming" information all at once .
- Context matching — Your recall is more robust when your current environment matches the environment you were in while learning the information .
- Creative association — Creating vivid or bizarre mental images, like picturing a celebrity performing an action, helps secure information .
- Lifestyle protections — Daily habits significantly impact whether amyloid plaque reaches the "tipping point" that causes Alzheimer's:
- Sleep — Deep sleep is critical for memory consolidation and flushing metabolic debris out of the brain .
- Diet — Eating a Mediterranean or MIND diet—rich in fish, vegetables, and nuts—can reduce Alzheimer’s risk by up to 50% .
- Exercise — Brisk aerobic walking for 30 minutes several times a week helps clear amyloid plaques .
- Stress management — Chronic, unmanaged stress physically shrinks the hippocampus; practices like meditation or deep breathing can lower cortisol and restore this brain area .
- Building cognitive reserve — Consistently learning new skills builds redundant neural connections, which allows the brain to "dance around" roadblocks caused by disease pathology .
Questions