🧠 Could Mushrooms Wake a Coma Patient?

The Edge of Consciousness

I recently had the chance to sit down for a conversation with Professor Robin Carhart-Harris and Tommaso Barba, a PhD candidate at Imperial College London.

The conversation moved through some of the biggest questions in psychedelics. Consciousness. Ego dissolution. DMT entities. Love. Aging. Spirituality. The strange places where science can measure something real, but still struggle to explain what it means.

But one part of the conversation stayed with me more than almost anything else.

I asked whether psychedelics could ever elevate consciousness in someone who barely has any, like a coma patient.

That question led Professor Carhart-Harris into a story involving a woman who had suffered a tragic road traffic accident. She went into a coma and later entered what is known as a minimally conscious state.

She could not speak. She was bedridden. She breathed through a tube. According to Professor Carhart-Harris, she could barely respond.

Her husband was desperate.

They had already tried medications and other interventions. Eventually, he tried magic mushrooms.

This was not a formal clinical trial. It was a heartbreaking real-life situation where someone was trying to reach the woman he loved.

Professor Carhart-Harris said that once he heard about the case, the suggestion was to record her brain activity with EEG if the husband was going to move forward with it anyway.

That opened the door to a question most people have probably never considered:

Could psychedelics change brain activity in someone with a severe disorder of consciousness?

And if the brain changed, would that mean the person became more conscious?

Consciousness Has Layers

Before getting into what happened, it helps to understand how Professor Carhart-Harris thinks about consciousness.

He made the point that consciousness may be easier to understand if we split it into parts.

At the most basic level, there is sentience. That means the simple fact of having experience at all. Feeling pain. Sensing warmth. Hearing sound. Having some kind of inner world, even a very basic one.

Then there is reflective awareness. This is the ability to know that you are aware. To think about your own thoughts. To recognize yourself as someone having an experience.

Then there is ego consciousness. This is the familiar sense of being “me.” A separate person with a name, a story, a body, memories, opinions, fears, hopes, and a place in the world.

That distinction changes the entire conversation.

When people ask whether psychedelics could “wake up” a coma patient, they might actually be asking several different questions at once.

Could the person’s brain become more active? Could their inner experience change? Could they become more aware? Could they communicate? Could they come back to themselves?

Those questions are connected, but they are not identical.

A brain can change without full awareness returning. An inner experience could shift without a person being able to speak. Something could happen inside consciousness without producing the kind of outward recovery a family would hope to see.

That is where this case becomes both scientifically interesting and emotionally difficult.

The Brain Signal

Professor Carhart-Harris connected the case to a concept he has spent years thinking about: brain entropy.

Entropy sounds complicated, but the basic idea is easier than the word makes it seem.

Think of the brain like music.

If the same note plays over and over again, the pattern is predictable. Nothing changes. You know exactly what is coming next.

That is low entropy.

If a jazz musician starts improvising, the pattern keeps changing. There is movement, surprise, complexity, and variation.

That is higher entropy.

In the brain, entropy describes how predictable or unpredictable brain activity is over time.

When someone is in deep sleep, under anesthesia, in a coma, or in certain disorders of consciousness, brain activity tends to become more predictable. The signal becomes more repetitive. There is less complexity.

When someone is awake, dreaming, emotionally activated, or in a psychedelic state, brain activity can become more complex and less predictable.

Professor Carhart-Harris explained that when consciousness is low or lost, entropy tends to be low. When some people emerge from disorders of consciousness, entropy can rise along with that emergence.

That is where psychedelics enter the conversation.

Psychedelics are known to increase brain entropy. People often describe psychedelic experiences as expanded states of consciousness. So the question became whether increasing entropy in someone with a disorder of consciousness could potentially lift consciousness in some way.

In plain English: if the brain is stuck in a very low-complexity state, could a psychedelic shake the system enough to bring some consciousness back?

What Happened With the Patient

The husband had access to EEG recording, so brain activity was measured while magic mushrooms were used.

According to Professor Carhart-Harris, her brain entropy went up.

The mushrooms appeared to change something measurable in the brain. The signal became less predictable. More complex. More like what researchers might expect if a psychedelic was having an effect.

Professor Carhart-Harris also said she looked like she was under the influence and was doing different things behaviorally.

But she did not wake up.

That is the hard line in the story.

The brain changed, but the change did not bring her back into communication. It did not restore reflective awareness. It did not lead to the kind of recovery her husband wanted.

Professor Carhart-Harris was careful about how he framed it. The experience may have changed the quality of her consciousness. It may have shifted something about basic sentience or inner experience. But it did not appear to raise her level of consciousness in a way that produced real-world recovery.

That difference is important.

A psychedelic may change the texture of consciousness without restoring the person’s ability to interact with the world.

It may increase brain complexity without reversing the underlying injury.

It may move something inside the system without reopening the door all the way.

That is a sobering result, but it still gives researchers something to think about.

Tommaso’s Point: Can the Change Last?

Tommaso Barba added another useful layer.

Even when a drug temporarily changes a severe neurological condition, the bigger question is whether the body and brain can sustain that change.

He brought up examples where patients can appear to wake up or regain function under a medication, but once the drug wears off, they return to the previous state.

That creates one of the major challenges in this field.

A substance might push the brain into a different mode for a short time. But if the underlying biology cannot support that new mode, the change may fade when the drug leaves the system.

That is especially important with disorders of consciousness.

Increasing brain activity is one thing. Restoring stable awareness is another. Helping someone regain communication, memory, personality, and connection is another level entirely.

The brain is not a light bulb that just needs more electricity. It is a living system shaped by injury, networks, timing, chemistry, and the body’s ability to hold a new state.

The Caution Inside the Curiosity

The woman later passed away.

That should be stated plainly and respectfully, without turning her story into a spectacle.

This was a tragic situation before it was a scientific question. A husband was trying to reach his wife. A researcher saw a chance to learn something from an intervention that was already happening. The result was meaningful, but not miraculous.

Her brain entropy increased.

She appeared different behaviorally.

She did not wake up.

Those facts have to stay together.

If the focus stays only on the brain entropy going up, the story becomes hype. If the focus stays only on the fact that she did not wake up, we miss the scientific question.

The truth sits in the middle: psychedelics may be able to change brain dynamics in severe disorders of consciousness, but that does not mean they can restore consciousness in the way people desperately hope.

At least not based on this case.

Professor Carhart-Harris said the result tempered his enthusiasm for the idea. He did not frame it as a dead end, but he also did not oversell it.

The question remains interesting.

The answer is nowhere close to settled.

The Signal Changed. The Mystery Remained.

This case sits at the edge of one of neuroscience’s hardest questions: what actually makes consciousness possible?

The hopeful part is that researchers can now measure pieces of the mystery. EEG can track brain activity. Entropy can help describe whether that activity is rigid or flexible. Psychedelics can show how quickly consciousness can shift when the brain enters a more complex state.

The humbling part is that a changed brain signal does not automatically mean a restored person.

Her brain responded. Her inner experience may have changed in some way no one can fully know. But she did not return.

That is where the story should stay: curious, careful, and deeply human.

Professor Carhart-Harris and Tommaso Barba’s conversation gives us a clearer way to think about consciousness without turning tragedy into hype.

Consciousness may have layers.

Brain entropy may help us understand those layers.

And psychedelics may offer one of the most powerful tools for studying them.

But the mystery remains.

Somewhere between brain activity, inner experience, and the fragile architecture of awareness, science is still trying to understand what it means for someone to be here.

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