Is Consciousness Just the Brain?

Opening a new series on mind, body, and what we still don't know

Here is a question that makes a great many scientists uncomfortable: if consciousness is simply what the brain does, what happens to it when the brain stops?

Not in a vague, hopeful sense. In a specific, documented, published-in-The-Lancet sense.

Pim van Lommel's landmark 2001 study followed 344 cardiac arrest survivors across ten Dutch hospitals. Eighteen percent reported structured, coherent experience during a period of confirmed clinical death, flat EEG, no measurable heartbeat, no brain activity by any standard we know how to detect. Some described specific events in the resuscitation room that they should not have been able to perceive. Several accounts were later corroborated by hospital staff.

Brain waves

Where the standard explanations run out

The reflexive response to this kind of finding is to reach for a physiological explanation, and there are several on offer. Oxygen deprivation to the brain has been proposed as a cause of the vivid imagery some survivors report. REM intrusion, a state where dreaming mechanisms bleed into waking consciousness, has been proposed as an explanation for the sense of being outside the body. Endogenous DMT release has been proposed as an explanation for the mystical quality many report.

Each of these theories closes a partial gap. None of them accounts for the central, harder fact: reported experience that is structured and coherent, rather than the fragmented, dreamlike confusion oxygen deprivation typically produces, occurring during a period when the brain, by every measure available to medicine, was not doing the kind of integrated processing that produces coherent experience in the first place. And none of the standard theories account for veridical perception, accurately described details of a room or a procedure the patient should have had no sensory access to.

The evidence that outlasts the moment

There is a second finding that deserves more attention than it usually gets. Near-death experiencers show measurable, lasting changes in personality, values, and fear of death that persist for decades afterward. Bruce Greyson, who has studied these cases clinically for over forty years, has documented consistent shifts: reduced fear of death, increased compassion, a durable reordering of what the person considers important. No ordinary hallucination produces changes like that. No drug experience, however intense, reliably restructures a person's values for the rest of their life. Whatever is happening in these moments, it is doing something that mere neurological noise does not typically do.

I am not arguing for an afterlife

I want to be precise about what I am and am not claiming. I am not telling you there is an afterlife, and I would ask any reader tempted to file this piece under religious comfort to set that impulse aside. What I am saying is narrower and, I think, harder to dismiss: the standard model of consciousness, the view that consciousness is straightforwardly produced by and confined to brain activity, does not currently account for this evidence. Intellectual honesty requires saying that out loud, rather than quietly assuming the model will eventually catch up, the way a debt keeps getting rolled forward rather than paid.

A different question to ask about consciousness

What if the brain is not generating consciousness at all? What if it is filtering it, the way a radio does not create the broadcast it plays, but narrows an available signal down to a receivable range? This is not a new idea. William James floated something close to it over a century ago, and philosophers working on panpsychism and related views have taken it seriously in recent decades, not as mysticism, but as a genuine response to how poorly the alternative accounts for the data.

The real mystery here may not be that consciousness could persist beyond the brain. The real mystery is that we ever assumed, with such confidence, that it was local to begin with.

Where this series is headed

Over the next five posts, this series will take up the questions that follow from this one directly: whether mind and body are one thing or two, what free will actually is and whether it survives everything we now know about conditioning, what the body knows before the conscious mind catches up, what altered states of consciousness, trance, dream, and near-death experience alike, might reveal that ordinary waking reason cannot access on its own, and finally, what it means to live well with a mystery that may never fully resolve.

I don't think philosophy owes us certainty here. I think it owes us honesty about where the certainty runs out, and the discipline to keep asking anyway.

Kathy Postelle Rixon is Chair of The Philosophical Society: Oxford, researcher, and seventh-level shaman. You can contact her at kathy@magicinharmony.com or visit her website at www.magicinharmony.com.