A neuroscientist’s guide to protecting your brain, in 58 minutes | Lisa Genova: Full Interview

Summary

Lisa Genova, an author and neuroscientist, explains how memory works, why ordinary forgetfulness is common, and which habits may support memory and brain health.

1. Memory is selective, distributed, and imperfect

• Memory is not a recording or a file stored in one place. A memory is a pattern of neural activity spread across brain areas involved in its contents—for example, visual and auditory regions for what something looked and sounded like.
• The hippocampus helps bind these separate elements into a memory that can later be consciously recalled.
• Genova describes four stages of memory:
  1. Encoding: Turning an experience or information into neural activity.
  2. Consolidation: Linking that activity into an associated neural circuit.
  3. Storage: Making lasting changes in the brain’s structure and chemistry.
  4. Retrieval: Reactivating the circuit to recall or recognize the information.
• She distinguishes three forms of long-term memory:
  • Episodic: Events and experiences from one’s life.
  • Semantic: Facts and knowledge, including personal facts such as one’s address.
  • Procedural (“muscle memory”): Learned skills and actions, such as riding a bike.
• The brain is especially likely to remember what is meaningful, emotional, surprising, new, repeated, or visually and spatially distinctive. Familiar, routine information may receive little attention and therefore fail to become a lasting memory.
• Meaning helps organize information. Genova describes a study in which experienced taxi drivers recalled street names well when the names followed a meaningful route, but lost that advantage when the names were presented in random order.
• Episodic memories can change when recalled. People may add, omit, or reinterpret details, then store the revised version over the previous one. This can make a memory drift over time, sometimes without deliberate intent.
• Remembering to do something in the future—prospective memory—is especially unreliable unless a useful cue is present at the right time and place. Forgetting an errand or intention is not, by itself, evidence of Alzheimer’s.

2. Practical ways to improve remembering

Genova’s advice includes several ways to help information stick and to compensate for memory’s limits:

• Pay attention when forming a memory. If distracted while putting down keys or driving a familiar route, you may never encode where you left an object or what you passed. In such cases, the issue may be inattention rather than loss of a stored memory.
• Use repetition and practice. Rehearsal strengthens the neural connections involved in recalling facts and performing skills.
• Space out study. Spreading practice across several days is more effective for retention than concentrating the same amount of study into one session immediately before a test.
• Test yourself. Try to retrieve information rather than only rereading it. Flashcards are one example: attempting to recall an answer strengthens learning more than passively reviewing it.
• Get enough sleep. Sleep supports the hippocampus as it consolidates memories. Genova cautions that late caffeine can interfere with sleep, despite caffeine’s potential short-term benefit for attention.
• Manage stress. Some acute stress may help focus and performance, but too much can interfere with recalling what you know. The right level varies by person.
• Use context as a cue. Recall may be easier when some conditions present during learning—such as sounds, smells, or other surroundings—are also present during retrieval.
• Create vivid associations. Imagination can make an item more memorable. For example, to remember to buy milk, picture an unusual scene involving milk in a familiar place.
• Make names less abstract. Repeat someone’s name, connect it with a familiar person or image, and create associations around it. Genova uses the “Baker–baker paradox” to illustrate why a person’s name may be harder to remember than the familiar word “baker.”
• Offload future intentions. Use notes, phone reminders, calendars, and checklists. Genova presents this as good practice, not “cheating”: airline pilots and surgeons use checklists rather than relying on prospective memory alone. Pairing a new task with an established routine can also help—for instance, placing medication near a toothbrush if it is to be taken at bedtime.

Technology has both costs and benefits. Notifications and constant scrolling can divide attention and reduce opportunities to form memories. On the other hand, looking up a name or fact does not, in Genova’s account, cause “digital amnesia”; online information can serve as an external aid. Photos, captions, tags, and locations on social media can also act as cues for revisiting memories.

3. Normal forgetfulness and Alzheimer’s

• Genova explains Alzheimer’s as involving an accumulation of amyloid beta, which can form plaques. After enough buildup reaches a “tipping point,” a cascade of brain changes can follow, including tangles, inflammation, and cell death.
• She distinguishes common lapses—such as forgetting a name, misplacing a phone, or forgetting why one entered a room—from more concerning changes. Her examples of possible warning signs include repeatedly forgetting recent conversations or events, losing many common words, or becoming lost in a familiar neighborhood.
• For example, forgetting which level of a garage you parked on may reflect not paying attention when you parked. Genova contrasts this with not recognizing one’s own car or not understanding how one arrived at the garage.
• She emphasizes that memory problems can have other causes, including B12 deficiency, insufficient sleep, or depression, and that not every memory lapse is Alzheimer’s. The interview offers general guidance, not a diagnosis.
• According to Genova, inherited genes contribute to risk, but lifestyle also matters for most people. She says only a small minority—about 2%—have Alzheimer’s that is fully inherited, and that amyloid accumulation can unfold over 15–20 years.

4. Habits that support brain health

Genova highlights sleep, diet, exercise, stress management, and continued learning:

• Sleep: It supports memory consolidation, helps the brain sustain attention the following day, and allows glial cells to clear metabolic waste, including amyloid beta. She argues that chronic sleep deprivation may therefore undermine both memory and brain health.
• Diet: She cites research on Mediterranean- or MIND-style eating patterns and recommends leafy greens, colorful fruits and berries, fatty fish, nuts, beans, and olive oil. She says such diets have been associated with a lower risk of Alzheimer’s.
• Exercise: She recommends aerobic activity, giving a brisk 30-minute walk four to five times a week as an example. She says studies associate exercise with lower amyloid levels and reduced Alzheimer’s risk.
• Stress reduction: Acute stress can be useful in moderation, but chronic stress may disrupt the body’s stress-response feedback system. Genova says persistent stress can impair memory, inhibit the growth of new hippocampal neurons, and shrink the hippocampus. She identifies social isolation, uncertainty, and perceived lack of control as common psychological stressors.
• Yoga, meditation, mindfulness, and exercise are presented as ways to help counter stress effects. Genova offers a brief breathing exercise: breathe in through the nose for a count of four, pause briefly, then breathe out through the nose for a count of four. She says slow breathing can signal safety to the body.
• Keep learning: Learning new things builds synapses and neural connections. Genova describes this as building cognitive reserve: additional or redundant connections may help the brain work around some damage and maintain function for longer.

Overall lesson: Forgetting is a normal feature of human memory, not proof that the brain is failing. Attention, repetition, cues, external reminders, sleep, healthy routines, stress management, and learning can all help people make better use of memory and support brain health.

Speakers and sources featured

• Lisa Genova — the interview’s speaker; author and neuroscientist.
• Big Think — the channel’s promotional outro appears at the end; no individual narrator is identified.
• Examples and research references mentioned by Genova: Akira Haraguchi; a taxi-driver memory study; brain-imaging studies; airline-pilot and surgical checklists; and research on sleep, diet, exercise, stress, and cognitive reserve.