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Transcript: Brain Rot WARNING! Expert Debate Reveals 3 Ways To Avoid Dementia


Read the full transcript of The Diary Of A CEO with Steven Bartlett podcast titled “Brain Rot WARNING! Expert Debate Reveals 3 Ways To Avoid Dementia” with expert guests: renowned brain health expert Dr Daniel Amen and Dr Terry Sejnowski, a pioneer in computational neuroscience, August 18, 2025.

Introduction: The AI Brain Health Debate

Steven Bartlett: Doctor Daniel, Doctor Terry, I have asked you both to sit with me today to help me understand the impact of these tools that we call large language models, the ChatGPTs, the Geminis of the world, the Groks of the world, are having on our brains, and I guess more broadly on our lives. And you two are experts in your field.

You’re two people that I admire tremendously. So by way of introduction, Terry, what is your academic background, and what is your experience? And I also know that you know one of our friends of the show, Geoffrey Hinton. Can you give me an overview of your academic and your professional background?

Dr. Terry Sejnowski: So I was born a physicist. I received a PhD in theoretical physics from Princeton University. And then I had the good fortune to work as a postdoc in the lab of Stephen Kuffler, who is the father of neurobiology. And that started my career as a neuroscientist. I pioneered a part of neuroscience, which is now called computational neuroscience, taking my skills as a physicist and trying to apply that to understanding the brain, creating models, theories, and we’re making progress.

Steven Bartlett: Doctor Daniel Amen, a bit about your background. My viewers know you well. But just to give an overview for anyone that might not have been exposed to your work and your experience, what have you spent your life doing? And what are your thoughts, your sort of top line thoughts on everything that’s going on at the moment with artificial intelligence?

Dr. Daniel Amen: So by training, I’m a psychiatrist. I’m a general psychiatrist and a child psychiatrist. When I graduated from medical school, I wanted to be a really good psychiatrist because someone I love tried to kill herself. And so it was personal to me. I have eleven clinics. We see about ten thousand patient visits a month, and we have the best published outcomes on complex treatment resistant psychiatric patients anywhere.

Steven Bartlett: So you’ve probably scanned more brains than any other human on earth at this point.

Dr. Daniel Amen: Probably, at least in regards to people who struggle with anxiety, depression, addiction.

The MIT Study: A Wake-Up Call

Steven Bartlett: Well, let’s talk about what’s good for the brain, bad for the brain, starting with AI. The reason why I wanted to speak to both of you is because I have frankly become pretty addicted to using ChatGPT and some of these other AIs and large language models every single day, all the time. And then this study came out from MIT.

It was fifty four participants who were recruited from five universities in Boston, MIT, Harvard, etc., and they had the participants split into three groups, had them writing different essays over I think it was four months. One group used ChatGPT, one group used Google, and one group had no tools, and they had to write these four essays over a period of time.

And astonishingly, MIT found a forty seven percent collapse in activity and brain connections when people wrote with ChatGPT compared with writing unaided. EEG scans showed the weakest overall brain activity in the ChatGPT group. The no-tool group, who didn’t use anything, they didn’t use Google or ChatGPT, lit up the widest neural networks, and Google search was second.

After using ChatGPT, participants couldn’t reliably quote their own essays minutes later, and their memory scores plunged. ChatGPT users felt little or no ownership over the text that they had produced, and didn’t feel like it was their work at all.

And when the AI group was forced to write without help in session four, their brain stayed in low gear, under engagement, showing the cognitive debt lingers even after the tool is taken away. It kind of scared me a little bit because I use these tools every single day, and this suggests that it’s taken away some of our critical thinking and creativity and long term learning.

And you’re both masters of the brain, in different regards. So my question, I guess, to Daniel is, what’s going on here, and how do you feel about it?

The Dementia Connection

Dr. Daniel Amen: It frightened me. I love thinking about Alzheimer’s prevention. It’s one of the things that really excites me. I just had a birthday on Saturday, turned seventy one. And if I make it to eighty five, which I plan on it, fifty percent of people eighty five and older will be diagnosed with dementia. So you have a one in two chance of having lost your mind.

And I’m like, no. But is this a tool that’s going to decrease cognitive load that then increases my risk? What’s cognitive load? How much work my brain actually does. And I was thinking it’s, you know, it’s like gone from a twenty pound weight to a two pound weight, and you’re not nearly as strong.

One of the important things to say about this study is it’s not peer reviewed. And I think that’s really important to say. And the author said, because I listened to an interview from the authors. They said, we thought this was so important and peer review can take six to eight months, which it absolutely can. And we thought this needed to get out. So it’s just important for people to know that.

Steven Bartlett: What’s this link, your this hypothesis you have between the usage of something like ChatGPT and dementia? For someone that doesn’t understand the sort of mechanism there around cognitive load and and so on, and the studies that support this idea that if you have less cognitive load, you’re at high risk of dementia.