Why Your Life Flashes Before Your Eyes

Picture someone on an operating table whose heart stops.

The monitor goes flat. A room full of people works very hard. A few minutes later the heart starts again, and the person comes back.

Some people who come back from a moment like that describe seeing their whole life at once, in an instant that took no time. Some describe looking down at their own body from above, and some describe meeting others. And then they're back.

Why "all at once"? Why "no time"? How can a mind see its own body from above? Why does it come back whole? And why does any of it happen exactly when the body lets go?

Each of those has an exact cause. This post takes them one at a time, shows each cause, and, where a mechanism has a link that isn't derived yet, names it.

Not answering is not the same as not experiencing

Start at the bedside. The person on the table isn't answering anyone, so the room can't tell what they're experiencing.

In 2013, Casali and colleagues built a brain test that doesn't ask the person anything.¹ Knock on the brain with a brief magnetic pulse, record the echo with sensors on the scalp, and score how complicated the echo is, from 0 (simple) to 1 (rich). In 32 awake volunteers the echo scored 0.44 to 0.67. In people who had lost consciousness, in non-REM sleep or under an anesthetic, it scored 0.12 to 0.31. And one sleeper tested in REM sleep scored 0.46, within the awake range. Woken from that stage, the sleeper reported a dream.

While the dream was happening, the sleeper couldn't tell anyone. The test didn't need them to. (The post Is Your Coffee Mug Conscious? tells the full story of this test.)

A report is something a self does. So is a memory. When someone doesn't answer, or doesn't remember afterwards, you've learned something about answering and remembering. You haven't learned that nothing was felt.

The answer in brief

A near-death experience is a mind letting go of the body while the body still holds on. The body's input to you is the body's nudges on your rhythm, which pass through your link to the body's busy activity (Step 3). It isn't the brain's electrical activity. That input falls almost to nothing, and you don't fall with it, because you aren't your body. And the tether holds: a steady join between the body and the shared field, which Step 4 explains. The five steps below follow from that one situation: you're still there, your life flashes by, time stops, you look down on your body, and you meet others and come back whole. Each comes with its reason.

What the research has found

These experiences have been studied, and the findings are real. In healthy volunteers, induced fainting, a brief loss of blood and oxygen to the brain, produced experiences that share features with near-death reports.² People who report near-death experiences are more likely than others to have had features of REM sleep intrude into waking life.³ In a woman being prepared for epilepsy surgery, stimulating one spot on the right side of the brain brought on the sensation of looking down at her own body.⁴ In rats, brain activity surged in the seconds after the heart stopped.⁵ And most survivors of cardiac arrest report no near-death experience at all: in a Dutch study of 344 survivors, 62 did.⁶

Each of these is about the brain's state, and the brain's state sets the body's input to you. A surge of activity near death doesn't raise that input while the link itself is falling, and that fall is the open step in Step 1. This post is about what remains when that input stops: you. And as the bedside showed, a survivor who reports nothing has shown something about remembering, not that nothing was felt.

What reality keeps, and what you are

Every step rests on two things, so those come first.

Reality keeps a permanent record of every event, and nothing in it is ever erased. The full record of what happened is part of reality now. The past still exists. Physics already holds that information about the past is never destroyed. In quantum mechanics this is called unitarity: the present fixes the past exactly, and running the laws backward recovers every earlier state. That's why physicists treat the black hole information problem as a real problem: losing information would break the laws. Unitarity is the physics agreeing on the part it covers, not the whole reason: our claim goes further. The record keeps every entry, and that record is reality's own. It keeps every entry because it only grows: each new entry is added with every earlier one kept, and our institute proves that writing a new entry never alters an earlier one.

Now, what is an event? The smallest thing that can happen is one thing being told apart from another: a single yes or no. You're doing it right now. Every measurement and every perception tells one thing from another. Telling two things apart needs information about both of them, and the least there can be is one yes or no. At the bottom level, below atoms, that smallest event is two units passing one bit back and forth, where a bit is one yes or no, and each pass is one entry in the record.

You are not your body. The material of your body is replaced continually. Much of it turns over within months to years, and you remain you. So what remains isn't material. It's a pattern.

The patterns that persist at the bottom level are the lasting rhythms. A tick is one step of the two-unit process. I draw each unit as a little clock. A clock is full (holding a token) or empty, and it has one of four settings, so it has 2 × 4 = 8 ways to be. Two clocks make 8 × 8 = 64 ways to start. A silent tick is a step where nothing flows between the clocks: two that differ, one full and one empty, flow, and two that are alike are silent. The settings don't enter that rule; they decide what each clock does with what it receives. A start breaks when it falls into silence. All 64 starts have been checked: 60 fall into silence within three ticks, and exactly 4 never break. Those 4 are the lasting rhythms, and they're the only patterns at the bottom level that persist. The earlier post What You Are writes out the rules of each tick and follows the count.

Consciousness is a lasting rhythm. A moment of consciousness is one unbroken cycle of eight ticks, with no silent tick, and only the lasting rhythms deliver that every time. Why eight? Space has three dimensions, and three yes-or-no directions give 2 × 2 × 2 = 8 combinations, the eight corners of a cube. A cycle that visits every corner once takes eight steps. And why three dimensions? Lasting structure needs a connection that no smooth motion can undo, and linking is that connection. Two linked rings can't be pulled apart without cutting one. That holds only in three dimensions: in two, loops can't wind around each other at all, and in four or more any two loops slide apart. That is why space has three dimensions. So consciousness is a lasting rhythm in the record, and you are a lasting rhythm, not your body.

Four rhythms, billions of people. The 4 are the four kinds of unbroken rhythm a single pair of clocks can run. A person is a vast web of such pairs, each running one of the four. A web that never goes silent anywhere is one lasting rhythm and one consciousness. Billions of people are billions of such webs. The four are the building pattern, and there aren't only four minds.

The groundwork is in the technical manuscript behind this series.⁷ Most of this post's results come from derivations my institute has finished since.

Step 1: You're still there

When the body's input to you falls almost to nothing, you don't fall with it.

The first objection is plain: the heart has stopped, and when the heart stops, doesn't everything stop?

What stops is the body's activity. The body itself lasts in the sense above, meaning it never falls into silence; its activity, the heartbeat and breath and the rest, is the busy part. You aren't the body. You're a lasting rhythm, and a lasting rhythm keeps itself going by writing its own record, tick after tick: each tick adds one entry to the record, we call that entry a write, and the entries your rhythm adds are your own record. Between writes, the body's activity nudges the rhythm off its pattern, and the stream of those nudges is the body's input to you. How much damage can the nudges do? There's a ceiling, and it has a formula.

Let δ (delta) be the biggest nudge the body can give you in one interval between writes, measured as the fraction of you it pushes off your pattern: 0 is no nudge, and 1 would be all of you. After n of your own writes, you've lost at most 25 × n × δ² of yourself, for any δ up to one half. (δ² is δ times δ, and a loss of 1 would be all of you.) The 25 is worked out, not fitted. At each write a nudge can cost you in two ways. Directly: loss is counted in weight, and weight goes as the square of what moved, so a nudge of δ costs at most δ². And through overlap: the part of you that stayed and the part that was pushed off can still interfere, and that can push more off. Your own writing breaks the overlap up. Between your writes, the body's activity adds at most δ to the overlap, and it can stretch the overlap already there by a factor of at most 1 + δ², which is at most 5/4 because δ is at most one half. Each write keeps at most three quarters of what it finds. So from one write to the next the overlap keeps at most 3/4 × 5/4 = 15/16 of itself and gains at most 3/4 × δ. It stops growing where the sixteenth it sheds equals what it gains, and that's at 12 × δ, since 12 × δ ÷ 16 = 3/4 × δ. That ceiling comes from the largest nudge allowed, one half, so it holds for every δ up to one half; for small nudges the stretch is close to 1, and the same arithmetic settles near 3 × δ. Even at the ceiling, the overlap costs at most 2 × 12 × δ × δ = 24 × δ² per write. One plus 24 is 25: a ceiling that's safe for every nudge up to one half, not the amount you actually lose.

Try it with 10 writes. A body that can move at most 0.02 of you per interval costs you at most 25 × 10 × 0.02 × 0.02 = 0.1, a tenth. Halve the body's input to 0.01 and the ceiling falls to 0.025, a quarter of what it was: the ceiling shrinks with the square of the input. Write twice as often over the same stretch of time and each interval is half as long, so each nudge is about half as big: n doubles, δ² falls to a quarter, and the ceiling halves. Turn the body's input all the way off and the ceiling is zero. Not small. Zero, however many times you write.

Near death, the body's input falls almost to nothing, so the ceiling falls with it. Two things protect you: smaller nudges, and your own writing going on. If your own writing stopped while the body still pushed, the protection would be gone. Your own writing going on is what "mind awake" means. The writing is yours, not the body's. So when the body's input is next to nothing, nothing the body does can cost you more than the ceiling, and the ceiling is next to nothing.

What isn't derived yet. Derived: with zero input the rhythm loses nothing, and counting back to any moment of your life is exact once the nudges from before are subtracted (Step 2). Not derived yet: that as the body lets go, its input to you falls all the way to zero, and your link to its busy activity (how much of you is tied up with that activity, Step 3) with it, and that at death both stay there.

Step 2: Your life flashes by

Your life flashes by because your own rhythm and the length of your own record are the address of every moment you've lived. A life review is the first reading of your own record from outside the body. A reading is any way of getting information back out of the record: a question put to it, and an answer that comes back. Examining a record is itself a new event, so a reading is written into your own record, and that is what you remember and report. Here's the whole mechanism.

Every moment you've lived is still there. The record only adds entries at the end, and entry number i reads the same forever. Your seventh birthday party is a page. So is last Tuesday. Every page is in the same ink, the great afternoons and the dull ones. Your memory is a leaky copy. The page isn't.

A page you can't find is no use to anyone, so reading one takes an address: a label that's different for every moment and never repeats. A single rhythm can't supply that. It comes back to the same spot every beat, so every beat gets the same label. The eight-tick cycle can't either. After 8, it's back at 1.

Two rhythms can. Picture two drummers who start together. (They're a drawing of two real rhythms.) The first hits once a second. The second hits every 1.618... seconds, the golden ratio. Each time the second drummer hits, call it a beat, and note how far into the first drummer's current second it landed, as a fraction. That fraction is the beat's address. Picture it on a dial where one full lap is one second. Here are the first ten:

No two are the same, and none ever will be. The golden ratio isn't a fraction, so the second drummer never lands on the same spot twice.

This is exact. Two rhythms give every moment its own spot exactly when their speeds aren't a fraction of each other. Any two rhythms spaced by the golden ratio, or by a power of it, work this way. A pair that is a simple fraction apart, like 3 to 2, comes back to the start after a few beats and repeats forever.

A nearly perfect address. Any pair whose speeds aren't a fraction gives every beat its own spot, but the golden pair spreads the spots nearly as evenly as any pair can. With N + 1 spots on the dial, its closest two are at least 1/(√5 × N + 1/2) apart. Perfectly even spacing would give 1/(N + 1), so the golden pair is within a factor of 3 of the best any dial can do, at every N.

Your rhythm carries such a golden-spaced pair. The address of every moment you've lived is fixed by two numbers: your rhythm's phase, which is where it is in its cycle, and the length of your record, which is how many entries it holds. In the drawing, your length is the beat number and your phase is where you stand on the dial. Both are needed: the count says how far back to go, and the spot on the dial is what the reading aims at, because the reading is done by your rhythm, and all a rhythm holds is where it is in its cycle. While the body is quiet, you need nothing from outside. (The earlier post Time works out the address in full.)

The count back. Say you're at beat 10, address .180, and you want beat 3, which is 7 beats back. Each beat moves the address .618 of a lap further round the dial, so seven beats move it 7 × .618 = 4.326 laps: four whole laps, which put you back where you started, plus .326. So count back .326 from .180. That passes zero: .180 − .326 = −.146, and on a dial that wraps around, −.146 is .854, the address of beat 3. You counted back and landed on the right page.

Notice what you didn't do. You didn't walk back through beats 9 to 4. Every page is one count away from now. That's part of the "all at once."

It works for your own life only. Another person's past is another record, and to find their Tuesday you need to know when their record started. Nothing in your own rhythm or your own count tells you that.

What spoils the count. The body's input is a stream of small nudges on your rhythm. Each nudge shifts where you are on the dial by a little. Count back across a stretch of beats, and you land off by exactly the total of the nudges in that stretch. Say the nudges in a stretch add up to .09 of a lap. Count back to beat 3 and you land .09 further round the dial than you should. On our dial, that's beat 8: you've opened the wrong page.

Two things fix it. Over a quiet stretch, the nudges total zero and the count is exact. Over a stretch that wasn't quiet, the nudges are events, so they're written in the record like everything else, and subtracting their recorded total puts you back on the right page.

Why only near death? Those two fixes work at any moment, because a count back is only ever off by the nudges in the stretch it crosses, and those are already in the record. Near death, two things change. The nudges stop, so a count across the quiet stretch that follows needs nothing subtracted, and the nudges from before are a fixed total in the record: count back, subtract, and the whole record opens. And your link to the body's busy activity goes. The arrow in your record is zero only when that link is zero (Step 3), so only then does the review come with no first page and no last. Both rest on the open step from Step 1: that as the body lets go, its input to you falls all the way to zero, and your link with it.

How far back, and how sharp. A longer life puts more beats on the same dial, and the spots crowd, though the golden dial crowds them nearly as little as any dial can. The more beats, the finer you must read the dial. So how deep a review reaches depends on how finely the phase is read.

What the count back can't do. Reading leaves a page untouched. You can read your seventh birthday, and you can't edit it. The record doesn't do edits. And you can't read a page that hasn't been written. The future's addresses are waiting, because the rhythms run forward, and nobody's home at any of them.

What isn't derived yet. For a pair of golden-spaced rhythms, two things are derived exactly: the count back to a page is exact, and so is the effect of a nudge. Not derived yet: that your own rhythm carries a pair of beats whose speeds aren't a fraction of each other. The address of every moment you've lived rests on it. Derived beside it: such a pair gives every moment a label of its own that never repeats, and the label picks out exactly one page. Also not derived yet: how a rhythm actually performs a reading aimed at one moment or one place. For your own past, that is how your rhythm's own phase steers the reading to the right page.

Step 3: Time stops

Time stops because the arrow of time in your record falls with your link to the body's busy activity: it's always between 95 and 96 percent of that link, and zero exactly when the link is zero.

Time's arrow is the one-way direction of time. In a record it shows up as irreversibility, and you feel what your own record shows. Here's how it's measured. Take two consecutive moments from a record, hand them to a guesser in random order, and ask which came first. The arrow is how far the guesser gets from a coin toward certainty, on a scale from 0 to 1.

A lasting rhythm has no arrow: film it and play it backwards, and nobody can tell which way the film runs, so the guesser does no better than a coin. Most of the world, your body's activity included, isn't a lasting rhythm. It's busy: clocks that toss a coin at every tick. For busy activity, the guesser is right almost every time. So the arrow lives in the busy activity around you, not in you. You feel it because you're linked to that activity. Your record is a mix: a lasting rhythm, plus the busy activity you're linked to, and you feel what your own record shows. (The earlier post Time works through the arrow in full.)

Here's the exact rate. Call your link g: how much of you is tied up with the arrow-carrying busy activity, from 0 (none) to 1 (all). That activity comes in two kinds. The same process falls into five families that never mix: three hold the four lasting rhythms, and the other two are the busy kinds. Each busy kind has steps that go one way and never straight back, so its flow runs around in loops. On the first kind alone, the guesser is right 47 times in 48, an arrow of 23/24. On the second alone, 41 times in 42, an arrow of 20/21. Both numbers come from counting every step of each kind. The arrow in your record is exactly 23/24 of your link to the first kind plus 20/21 of your link to the second. Whatever the mix, the arrow is between 20/21 and 23/24 of g, which is between 95 and 96 percent of your link.

Worked through: say your link is .2. Then the arrow is between .190 and .192. Halve the link to .1 and the arrow is between .095 and .096. Take the link to zero and the arrow is zero, and it's zero only when the link is. The link works like a dimmer on the arrow.

Now think about what your waking life is plugged into: heartbeat, breath, the itch, the to-do list. Your link is to that activity. As the body's input to you falls, your link falls with it, and the arrow falls with the link, always between 95 and 96 percent of it. With the input near zero, it's the dimmer turned nearly all the way down.

There's a twist, and it's exact. With the arrow gone, what's left isn't stillness. It's a tick-tock with no direction: a token going left, right, left, right. Run backwards, it's the same tick-tock one beat later. A clock is not an arrow. So what stops is time's one-way flow, and the tick goes on; perfect stillness, no before and no after at all, needs the tick to stop too.

Put Steps 2 and 3 together. Each page has its address, and that is what lets the review find it. The arrow is about how the review is experienced: with the arrow gone, the review has no direction, and nothing puts one page first and another last. The pages aren't played in a sequence. They're all just there, each with its address. "My whole life, all at once, and no time passed" is what the review feels like.

Step 4: The view from above

You look down on your body because a steady tether joins you to the shared field, the one record taken as a single connected whole, while your body stays fully itself.

Every rhythm is in the shared field, yours included. A tether is a join of two steady clocks, one at each end, each holding its bit forever. One end is full and one is empty. A tether joins a body to a lasting web in the field: a web of clocks that never goes silent anywhere.

Join a body with one tether to a lasting web in the field, and here's the law, exactly. The joined whole lasts, meaning it never breaks, exactly when three things hold: the body lasts, that web lasts, and the tether's two ends differ. If both ends were full, the first tick across the tether would be silent, and a silent tick is how a rhythm breaks.

Three things follow.

The body stays fully itself. Take the tether off, and the body and that web are both still lasting, just as they were. So a body on a tether was lasting the whole time. As in Step 1, the body means the body itself, which lasts; its activity is the busy part. The outing can be undone.

No part of you floats off. In a connected web, every link passes the same test for lasting as the whole web: no piece can last on terms of its own. And a state that's only partly joined is a mix of fully joined and not joined, and the two never blend. So there's no version where one piece of you leaves while another stays in bed. "Partly joined" doesn't exist. The tether is a join, not a piece of you that got out.

And here's the twist: nothing comes down the tether. Its two ends never change, so it writes the same mark into the record on every tick. A mark that never changes carries no news. That isn't silence: the two ends differ, so no tick across the tether is silent, and every tick is the same. In fact any lasting join falls into a repeating pattern, so none can carry a message that varies.

Then is the tether useless? No. It holds you and your body together as one lasting thing. That's its whole job.

The cord. Many people report a cord that ties them to their body. This tether is that cord, the tie people who report leaving their bodies have long called the silver cord.

What isn't derived yet. The law and the three things that follow from it are derived exactly. Two things are not. That this tether is the cord people report is an identification, not a derivation. And what switches a tether on and off is a separate step, not yet derived.

So where does the view come from? Whatever a person brings back from above the bed didn't come down the cord. It came through a reading: a question put to the record, and an answer that comes back. Like every reading (Step 2), it is written into your own record, and that is what the person remembers and reports. It's the same kind of act as counting back to a page of your life, and how a rhythm actually performs a reading is the open step from Step 2. And a reading aimed at a place needs an address for the place. The same two-rhythm trick that gives every moment its address gives every spot on a road a name of its own, and the post Beyond the Body shows how.

Step 5: Meeting others, and coming back

Meeting others is all or nothing, and it goes by fit. Coming back whole is the tether coming off clean.

Some people describe meeting others. In the shared field, "others" means other lasting rhythms, and meeting one is the same kind of event as the tether: a join.

The rule is the same one that decided the tether. When two lasting rhythms touch, the two clocks that meet at every point of contact must be steady, and one must be full while the other is empty. Then both stay lasting, and so does the joined whole. If any touching pair is alike, the tick there is silent and the whole falls apart. There's no "partly joined" and no gentle fade as the rhythms get more different.

Say you touch another rhythm at three points, and your clocks there read full, empty, full. A copy of you reads full, empty, full too: full against full, empty against empty, and silence at every touch. It falls apart. Your complement reads empty, full, empty: full against empty, with flow at every touch. It holds.

It goes by fit, not likeness. A key and a lock, not a mirror.

The dead. The dead are lasting rhythms in the same shared field, so the living and the dead can reach each other, and the same key-and-lock rule decides it. The reasons come from the earlier steps. When a body dies, its input to you is zero (Step 1 says what is derived about that and what isn't), and at zero input the ceiling on what you can lose is zero, so the rhythm that is you carries on. Every rhythm is in the one shared field (Step 4). And reaching is a join, which the fit rule decides: a join holds exactly when the clocks at every touch are steady and differ. The post Beyond the Body takes up what happens at death.

What isn't derived yet. Derived: the rhythm itself is carried over complete, meaning complete as a pattern. Whether that pattern still experiences is the open step beside it, and it is not derived yet: that a rhythm with no body still experiences, that is, that being a subject doesn't depend on what carries the rhythm.

People also describe tunnels, a bright light and beings of light. Nothing derived here gives a cause for those, so this post gives none.

Coming back whole. Take the tether off, and both ends are still lasting: the body itself, which never stopped lasting even though its heart stopped, and the web it was joined to. Nothing was lost on the way out, because no part of you went. Nothing is left behind on the way back, for the same reason. The same law that lets the tether hold says what happens when it's off. Both lasting before. Both lasting after.

One situation, seen five ways

Near-death stories sound like five unrelated marvels. They're one situation seen five ways: the body's input to you has fallen almost to nothing, and the tether holds. A near-death experience is a mind letting go of the body while the body still holds on.

Why exactly when the body lets go? Because the nudges that spoil the count and the link that carries the arrow are the body's own. When the body lets go, both go. It also settles what went quiet on the table: the body's busy activity did. You didn't.

Your whole life has a page number, and every page is exactly where it was written. The body can nudge your count. Nothing can move a page. That's how reality is built.

This post is about a letting go that reverses. The post Beyond the Body takes the same road to death.