2561 people saw the same thing on DMT. Did anyone measure what happened the next day?

No. Johns Hopkins surveyed 2561 DMT users (Davis et al., 2020) and found that they independently described the same visual pattern: kanji-like glyphs scrolling vertically. Imperial College London (Timmermann et al., 2019) mapped the correlate of that state in an electroencephalogram while the substance was active. Together, the two studies cover the memory of the experience and the instant of the experience. Neither covers the following morning, the next night, or the week after. That stretch of time simply has no data attached to it.

What did Johns Hopkins find when it asked 2561 people?

Davis et al. (2020) ran a retrospective survey. They asked 2561 people who had already taken DMT to describe what they saw. The agreement wasn't in mood or interpretation — it was in form. Person after person, without having coordinated with each other, described vertical symbols resembling script, moving as if the entire visual field were a screen scrolling upward. That is a real finding. A pattern repeating across thousands of accounts separated by time, place, and person is information, not anecdote.

But a survey asks about memory, not about the body. What Davis et al. (2020) recorded is what people say they saw after having lived through it. There is not a single physiological measurement in that dataset — no heart rate, no temperature, no sleep record, nothing a sensor captured while the experience was happening. It is language describing an experience, filtered through the memory of the person who had it.

What did the Imperial College EEG add?

Timmermann et al. (2019) resolved the half the survey couldn't touch: what the brain is doing while a person is seeing that. Using electroencephalography, they captured electrical activity during the DMT effect and found a pattern that correlates with the subjective report of the moment. That is the piece Davis et al. (2020) lacked — not a memory reconstructed afterward, but a signal captured in real time, while the phenomenon is actually occurring.

Between the two studies, 2019 and 2020, the field closed a loop that looks complete at first glance: the experience is described the same way across thousands of independent accounts (Johns Hopkins), and it carries a recognizable electrical signature while it is happening (Imperial College). That is more rigor than most claims made about altered states of consciousness ever get.

	Johns Hopkins — Davis et al. (2020)	Imperial College — Timmermann et al. (2019)
What it measured	Retrospective survey of 2561 people	Electroencephalogram during the effect
When the data was taken	After the fact, from memory	During the fact, in real time
What it contributed	The same visual pattern, described independently	A recognizable electrical correlate of the state
What it doesn't cover	The body, only the account	What happens once the effect ends

Why isn't a survey the same as a measured body?

Because a report is a proxy, not the thing itself. When someone tells you what they saw a month ago, a year ago, or a decade ago, they are not handing you the state — they are handing you whatever reconstruction their memory made of that state, edited by language, by what others have already said, by what they expected to find. The EEG solves part of that problem — it captures the signal in the moment, not in the memory — but only for the window the effect lasts. The instant the substance stops acting, the electroencephalogram stops watching too.

That is the hole: the proxy — what a person remembers, what an electrode picks up while the effect lasts — is not the thing itself: what happens in a body afterward, once there is no substance and no electrode left recording. Nobody has published a single night of physiological data collected AFTER a DMT session, not in the 2561 people surveyed by Davis et al. (2020), not in the subjects studied by Timmermann et al. (2019). The day after is instrument-free territory.

The same hole, any ordinary night

This hole isn't unique to DMT. It's the same hole that opens every time someone describes an intense experience — a bad night of sleep, a hard workout, an argument — and afterward nobody measures what happened in their body while they slept. "I slept badly" or "I woke up drained" is a report, exactly like the DMT users' accounts: it describes how something felt, not what the organism actually did. Closing that hole doesn't mean trusting the memory more. It means putting a sensor where only memory used to stand, and letting the body write the data instead of the story.

The limit

Here is what these two studies do NOT say. They do not say what happens to the body the night after a DMT experience — not to sleep, not to heart rate, not to any physiological variable. They do not say whether the visual pattern described by the 2561 people in Davis et al. (2020) has a verifiable common cause beyond the coincidence of the accounts themselves. They do not say whether the EEG signature Timmermann et al. (2019) found persists, fades, or disappears once the effect ends — because nobody kept measuring after it ended. A survey measures memories. An EEG taken during the effect measures an instant. Neither measures what comes after. That part still has no data, and we're writing it down before anyone has to ask.

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Keep exploring the same hole in Mental Work — all protocols and the related file: dmt-laser-matrix-code. The full method, with its data and its published limits, lives at open science — the dataset.