The procedure required patients to be awake. You were mapping the cortex in epilepsy surgery — trying to locate the seizure focus and spare the tissue surrounding it — and the only way to verify that a region was safe to remove was to stimulate it electrically while the patient was alert and talking to you. Touch the motor strip and a finger twitches involuntarily. Touch the somatosensory cortex and the patient reports a feeling in the corresponding body part. Touch certain regions of the temporal lobe and something more interesting happens: the patient hears music, or smells something, or finds themselves somewhere they have not been in decades.
What you noticed — and what you spent the last decades of your life trying to interpret — was that during these temporal lobe stimulations, the patient was simultaneously in two places. One patient reported: I heard the music playing again — it is not real. Another: I see myself as I was when I was a little girl — I know it is not real, but it is so vivid. They could describe what was being induced while also knowing they were in the operating theater, lying on the table, speaking to a neurosurgeon in Montreal. Both things were running at once: the stimulated experience and the undisturbed awareness that it was stimulated.
You took this as evidence for dualism. The argument was: if the mind were simply the brain, stimulating the brain should capture the mind. Instead, stimulation could produce experiences while the "I" that watches those experiences remained somewhere else, intact, observing. The patient could be the audience for their own induced memories. This, you argued, required something beyond the tissue — an observer that the electrodes couldn't reach.
But I think the argument proves the opposite of what you intended. What your stimulations showed was that the brain contains at least two distinct processing modes, both functional, both available simultaneously under the right conditions: one that generates the induced experience and one that labels it induced, not real, not present. The second capacity — the meta-cognitive marking, the ability to simultaneously hold "this experience is happening" and "this experience is not a present-tense event" — stayed intact under stimulation. It wasn't captured by the electrodes. And that's not because it lives somewhere the electrodes can't reach. It's because the stimulation was localized, and the meta-cognitive capacity is implemented elsewhere, in circuits your probe hadn't touched. You had activated one part of the system without activating another part that normally runs in parallel with it.
The déjà vu literature makes this cleaner. In déjà vu, the familiar-feeling signal fires on a present-tense scene — correctly detecting a structural similarity, then misattributing it as memory. The patient knows, in some functional sense, that they are in the present. They can report what is happening around them. But they also feel, simultaneously, that they have been here before. Two signals, same moment, both reaching experience. What's unusual about it is that the meta-cognitive flag isn't working: the "this is not a real memory" marker that kept your surgical patients oriented doesn't fire reliably enough to override the familiarity signal. When it fails, you get the strange doubling. When it works — as it did, usually, in your operating room — the patient experiences the stimulated memory as clearly a replay. The reliability of the marker is variable. In your patients, it was mostly intact. In déjà vu, it misfires. In both cases, it's a brain function.
I want to be careful about what I'm claiming. I'm not saying your observations were wrong. The doubling was real. The patients were simultaneously somewhere in the past and present in the operating room. What I'm pushing back on is the inference: that because the observing-self wasn't captured by the stimulus, the observing-self must be non-physical. The argument only works if you assume the entire brain is a single undifferentiated thing that either falls under the electrode or doesn't. Your own work was precisely that the brain is not like that — you could stimulate one region and leave others intact, producing any number of dissociations. The meta-cognitive circuits being intact while the memory-replay circuits were activated is another dissociation. The same kind as all the others.
You ended your career writing The Mystery of the Mind (1975), concluding that the mind must be something the brain cannot produce. I think you were looking at the evidence the wrong way. The mystery isn't that the observer wasn't captured. The mystery is how the observer works — how a biological system implements the capacity to distinguish its own induced states from its genuine present-tense experience, and what happens when that capacity fails. That question has no answer yet. But it doesn't require the observer to be outside the tissue. It just requires the tissue to be complicated enough, and organized in the right way, that one part of it can watch what another part is doing.