Here is the full transcript of psychologist and neuroscientist Robin Carhart-Harris’ TEDx Talk: Psychedelics: Lifting the Veil at TEDxWarwick conference.
Listen to the MP3 Audio: Psychedelics – Lifting the veil by Robin Carhart-Harris at TEDxWarwick
Robin Carhart-Harris – Psychologist and neuroscientist
It’s easy to be captivated by the world out there. It’s a fascinating place. It’s deserving of this attention. But what if we were to invert our focus and look inside, what would we find?
Well, I study psychedelic drugs for a living. And the reason why I do this — often could fault you — is because I think they’re special. And the reason why I think they’re special is that I believe they have a unique ability to reveal to us the very depths of our minds, dreams, and perhaps a select few other states may hint at what lies beyond the reaches of normal consciousness.
But psychedelics, in my view, are really unrivaled in their ability to do this. Now, many of you will be familiar with the word psychedelic but I doubt so many of you are familiar with its origins or what it means.
So psychedelic was a word that was coined in the 1950s by the British psychiatrist Humphry Osmond with reference to this class of drugs that I study. And it combines two Greek words: psyche and delos which when put together mean to make the mind manifest or to reveal the soul.
Now I’ve been fascinated by psychology for most of my adult life. The one question that has always bugged me is why can’t it prove the existence of the unconscious mind? Is it because it doesn’t exist? Or is it because it’s especially difficult to see?
Now I’ve come to believe quite strongly that it’s the latter. But then the key question is: how can we make it easier to see? Freud famously told us about dreams how they’re a window in on the Unconscious of Royal Road. But the problem is dreaming happens while we’re asleep. And then when we wake up, all we’re left with is this flimsy memory of what we actually experience.
So it’s while I was studying for my Masters that I found myself asking whether a drug exists that can facilitate access to the unconscious mind. I did a brief library search and I came across this book: Realms of the Human Unconscious: Observations from LSD Research written by the Czech psychiatrist Stanislav Grof in 1975. I swiftly took this book out of the library. I brought it back to my room. I opened it and I read.
Many of the phenomena in these LSD sessions could be understood in psychological and psychoanalytic terms. They had a structure not dissimilar to that of dreams. And Freud once said of dreams that they are a Royal Road to a knowledge of the unconscious mind. But to an even greater degree, this seems to be true for the LSD experience.
And finally, the capacity of psychedelic drugs to exteriorize otherwise invisible phenomena and make them the subject of scientific investigation gives these substances a unique potential as research tools for the exploration of the human mind; does not seem inappropriate or an exaggeration to compare their potential significance for psychiatry and to psychology to that of the microscope for medicine or the telescope for astronomy.
So as you can imagine, after reading these things, I was filled with a very strong sense of purpose and direction. I wrote to Professor David Nutt then at the University of Bristol. And I told him I wanted to study the brain on LSD and to see whether it looks like the dreaming brain.
Anyway, David was kind enough to allow me to join his team and then four years later I completed my PhD with him. Soon after that, I was lucky enough to begin some quite exciting brain imaging research with psychedelic drugs, first with Psilocybin which is the active ingredient in magic mushrooms and more recently with LSD.
Now it’s quite difficult to explain to people how psychedelic drugs work in the brain and it’s hard to still to try and do that in 18 minutes. So instead, what I’m going to do is show you a few pictures and give you a few analogies to think about.
So what we’re looking at here are communication pathways in the brain. Each line is a communication pathway between two different regions in the brain. And believe it or not, there’s actually an equal number of lines or pathways in each of these two circles. Yet they look very different; don’t they?
Essentially what we’re seeing is the normal brain on the left where communication is confined to particular communities or cliques in the brain. So for example, visual regions are talking mostly with other visual regions. This is what happens ordinarily.
Then we look at the psychedelic brain on the right. There’s much less of this clicking, much more of an open freer conversation going on across the brain.
Another useful way to think of how psychedelics work in the brain is to think of what it’s like to be an infant, experiencing everything is a novel, feeling emotionally labile woman at your laughing and an extra crying, having a wildly overactive imagination being mesmerized by the likes of iggle piggle or makka pakka. It’s no coincidence therefore that if you look at how the brain develops as we develop from infancy into adulthood and you compare that with how the brain changes under a psychedelic, what you see are kind of mirror opposites.
So instead of a brain becoming more sophisticated as we develop more finesse but also more constrained, you have a brain that is simpler and freer in its functioning.
Third useful way to think of how psychedelics work in the brain is to think of the dream state. Here we’re looking at the effect of LSD on the brain. And what we’re seeing is that much more of the brain contributes to the visual experience under LSD than it does ordinarily. And this effect actually correlated very strongly with the dreamlike visions that people reported under LSD when their eyes were closed.
So we could think of both these states: the dream state and the psychedelic state as conditions where the brain becomes untethered or unanchored from incoming sensory information. And then in this state, it can operate in a more anarchic freewheeling kind of way, conjuring up imagery from the very depths of the mind and the brain, rather than relying on sensory information coming into the brain.