Understanding Memory and Aging

Memory is, in many ways, the essential component of our lives. It shapes our perceptions, experiences, and even our identities. However, as we get older, memory tends to decline. Despite the investment of billions into understanding the biological underpinnings of dementia, finding a cure has, for the most part, been unsuccessful.

What if we shifted our focus, though? Instead of examining the brains of those with significant memory loss, we could study individuals who are aging exceptionally well—the “super-agers.” These are people over 80 who possess the memory capabilities of much younger individuals. Sandra Weintraub, a researcher at Northwestern University, has been part of a team dedicated to exploring this phenomenon. In a recent paper, she pointed out that super-agers don’t seem to share many characteristics, such as common diets or exercise routines. However, they all have one key feature in common: strong social connections.

In this discussion, Sandra Weintraub talks about the science behind memory and the brain, highlighting the importance of social relationships for mental health.

As for any questions, thoughts, or suggestions for future episodes, feel free to email us at PlainEnglish@Spotify.com.

Conversation Excerpt: Derek and Sandra on Memory Research

Derek Thompson: Your work covers memory, aging, Alzheimer’s, and dementia. What led you to this area?

Sandra Weintraub: Oh, that’s quite a journey. If we go back to my time at McGill University, it was one of the first places in North America focusing on the connection between brain activity and behavior. I was fascinated, but there weren’t many options for a clinical career in that field, unless I wanted to become a neurosurgeon, which wasn’t my path. Eventually, neuropsychology emerged as a specialty, and I was drawn to it. It focuses on the effects of brain injuries rather than just emotional or psychological aspects. My interest in aging developed while working at the Boston Aphasia Research Center, where I engaged with individuals who had lost their ability to communicate after strokes. As I worked in various settings, I encountered many older patients, mostly in advanced stages of dementia. This experience led me to explore the early signs of dementia, realizing that it doesn’t just appear suddenly—it has roots that can often be traced back many years.

Through my work, I began noticing cognitive changes in some individuals without severe memory issues, and I was intrigued by super-agers who seem to maintain their memory remarkably well.

Thompson: Let me pause you there. Can we clarify some terminology? What exactly is aphasia?

Weintraub: Absolutely! Aphasia refers to the loss of language abilities, whether it’s understanding, speaking, or reading. It often results from a stroke or neurodegenerative conditions affecting language processing in the brain.

Thompson: And how do we differentiate between normal aging and something like dementia or Alzheimer’s?

Weintraub: That’s a big question! Normal aging is often gauged through standardized tests among older adults. When scores are averaged, we see a wide variation. While younger populations show less variability, older individuals can perform at levels comparable to much younger people. For me, I don’t see “normal aging” as a strict category.

When we talk about dementia, it’s more productive to frame it as cognitive impairment. There are stages. Many people experience mild cognitive impairment yet still manage daily life quite well. It’s the point at which memory issues significantly disrupt everyday functioning—like forgetting to pay bills or losing your way while driving—that we classify as dementia.

This conversation has been condensed and edited for clarity.