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"? Why would a mind look down at its own body, and 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.

The short answer

A near-death experience is a mind letting go of the body while the body still holds on. The body's input to you falls almost to nothing, and the tether to the body holds. The life review, the missing time, the view from above, the meeting and the way back each then have an exact cause.

Here's the whole answer in five steps. The rest of this post takes them one at a time and shows how we know each one.

1. You're still there. The body's input falls almost to nothing. You don't fall with it. A lasting rhythm keeps itself going by writing its own record, so the body only nudges it. And a person who can't answer hasn't shown that they stopped experiencing.
2. Your life flashes by. Your own rhythm and the length of your own record are the address of every moment you've lived. The body's nudges are what throw the count back off, and near death they stop.
3. Time stops. The arrow of time you feel shrinks in exact proportion to your link with the body's busy activity. As the link goes, so does the arrow.
4. You look down on your body. A steady tether joins you to the shared field while your body stays fully itself. Nothing comes down the tether, so what you see arrives as a reading.
5. You meet others, and you come back whole. Contact between lasting rhythms is all or nothing, and it goes by fit, not likeness. And when the tether comes off, it comes off clean.

Why this matters: near-death stories sound like five unrelated marvels. They're one situation seen five ways: the body's push is gone, and the tether holds. It also settles what went quiet on the table. The body's busy activity did. You didn't.

This post is about a letting go that reverses. Part 3 of the series follows the same road to death.

Previously

Here's what you need from the earlier posts, in about a minute.

Reality is a permanent record. Every event is written down and nothing is ever erased. We call it the ledger. If it had a personality, it would be unflappable, extremely thorough, and armed with one response to everything that has ever happened: Noted.

You are a lasting rhythm, not your body. Below the level of atoms, two units pass a bit back and forth, and each pass is one entry in the ledger. I draw each unit as a little clock that's either full (holding a token) or empty. A tick is one step of the process, and a silent tick is one where nothing flows between the clocks. Of the 64 ways the process can start, exactly 4 never break. Those are the lasting rhythms. A moment of consciousness is eight ticks with no silent tick, and only the lasting rhythms deliver that every time. You are one of them. (Part 1, What You Are)

Time's arrow lives in the busy activity around you. Most of the world, your body's activity included, is busy: clocks that guess and toss coins, like Gary, a drummer who flips a coin before every beat. (Gary is not getting the gig.) The one-way direction of time lives in that activity, not in you. You feel it because you're linked to it. (Part 2, Time)

Your own past carries its own address. A reading is any way of getting information back out of the ledger: a question put to it, and an answer that comes back. Your rhythm, together with the length of your own record, picks out every moment you've lived, so you can aim a reading at any of them. (Part 2)

A tether can join you to the shared field. The shared field is the one ledger, taken as a single connected whole. A tether of two steady clocks, one full and one empty, joins a body to it, and the body stays fully itself. (Part 3, Beyond the Body)

The groundwork is in the technical manuscript behind the series.¹ Most of this post's results come from derivations my institute has finished since.

Here's today's route. I'll stop after each step to zoom out, so you always know where we are.

Step 1: You're still there

When the body's input falls almost to nothing, you don't. Here's how we know.

Yeah-But, the voice in the back of your head, has been waiting for this.

"Yeah, but the heart has stopped. Doesn't everything stop?"

What stops is the body's activity. 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. Between writes, the body's input nudges the rhythm off its pattern. How much damage can those 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, as a small fraction 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.)

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. Write twice as often 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. That's what "mind awake" means in Part 3. The writing is yours.

Now look at it from the bedside. The person isn't answering, so the room can't see what they're experiencing. Not reporting is not the same as not experiencing.

In 2013, Casali and colleagues built a brain test that doesn't ask the person anything.² 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 full story is in the coffee mug post.)

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.

Zoom out. Step 1 is done. When the body's input falls almost to nothing, the most you can lose falls with it, and a quiet bedside tells you nothing about what the person is experiencing. Next, and why: if you're still there, what's it like? The first thing people report is their whole life, all at once. That's an address problem.

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. Part 3 spent one sentence on it: a life review is the first reading of your own record from outside the body. Here's the whole mechanism.

Every moment you've lived is still there. The ledger 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 ledger's 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. (A number that never repeats itself is a terrible dinner guest and an excellent address.)

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.

Your rhythm carries such a pair. Picture your record as a diary with one page a day. The diary is a drawing of the real mechanism: the page number is your rhythm's phase (where it is in its cycle) together with the length of your record. Those two numbers fix the address of every moment you've lived. While the body is quiet, you need nothing from outside.

The count back. Say you're at beat 10, and you want beat 3. Your address now is .180. Beat 3 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. And .854 is 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, 8, 7, 6, 5 and 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 diary, and to find their Tuesday you need to know when they started. Nothing in your own record tells you that.

What spoils the count. The body's input is a stream of small pushes on your rhythm. Each push 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 pushes in that stretch.

Say the pushes 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. In the diary, someone bumped your hand as you turned to the page, and you've opened the wrong one.

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

Near death, the body's input falls almost to nothing and the pushes stop. From then on the count back is clean, and the pushes from before are a fixed total in the record. Count back, subtract, and the whole diary opens. The Ledger would like it noted that every page was ready the whole time, and that it was never the one bumping your hand.

How far back, and how sharp. A longer life puts more beats on the same dial, and the spots crowd. Count the starting beat as beat 0, at address 0. Beats 0 to 10 make 11 spots, and the closest pair sit .056 apart (beats 0 and 8, 1 and 9, 2 and 10). No dial of any kind can keep 11 spots more than .1 apart.

The golden dial does nearly as well as any can. With N + 1 spots, its closest pair are at least 1/(√5 × N + 1/2) apart, within a factor of 3 of the best possible at every N. 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 ledger 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.

A plain note on where this stands. For a pair of golden-spaced rhythms, the address, the count back and the effect of a nudge are exact. The step still being worked out is the last link: how your rhythm's own phase steers the read to the right page.

Zoom out. Step 2 is done. Every moment you've lived is a page with its own address. Your rhythm and the length of your record fix every address, and the body's pushes are exactly what spoils the count. Next, and why: people report "no time." The count back opens the pages. What takes the time out of it?

Step 3: Time stops

Time stops because the arrow of time you feel shrinks in exact proportion to your link with the body's busy activity.

You met this in Part 2. Time's arrow lives in the busy activity around you, not in you. Film your rhythm and play it backwards, and nobody can tell which way the film runs. You feel the arrow because your record is a mix: a lasting rhythm, plus the busy activity you're linked to. You feel what your own record shows.

Here's how the arrow is measured. Take two consecutive moments from a record, hand them to a guesser in random order, and ask which came first. For a lasting rhythm, the guesser does no better than a coin. For busy activity, the guesser is right almost every time. The arrow is how far the guesser gets from a coin toward certainty, on a scale from 0 to 1.

And 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 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, about 95 to 96 percent of it.

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.

Now think about what your waking life is plugged into: heartbeat, breath, the itch, the to-do list. A whole city of Garys. Near death, the body's input falls almost to nothing and the city goes quiet with it. For once, nobody is flipping a coin before the beat. Your link falls, and the arrow falls in exact proportion. It's the dimmer from Part 2, 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: the swing's token going left, right, left, right. A clock is not an arrow. Perfect stillness, no before and no after at all, needs the tick to stop too. That's the hub from Part 2.

Put Steps 2 and 3 together. The address picks the page, and the missing arrow takes away the order. With the arrow gone, there's no "before" to put first and no "after" to put 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.

Zoom out. Step 3 is done. The arrow lives in the busy activity. When your link to it falls, the arrow falls in exact proportion, and at zero link it's gone. Next, and why: looking down at your own body. What's joined to what?

Step 4: The view from above

You look down on your body because a steady tether joins you to the shared field while your body stays fully itself.

Part 3 introduced the pieces. The shared field is the one ledger, taken as a single connected whole, and every rhythm is in it. 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. Part 3 called it the silver cord, the name people who leave their bodies have long given the tie.

Join a body to the field with one tether, and here's the law, exactly. The joined whole lasts exactly when three things hold: the body lasts, the field lasts, and the tether's two ends differ. If both ends were full, the first tick across the tether would be silent, and you know what silence does.

Three things follow.

The body stays fully itself. Take the tether off, and the body and the field are both still lasting, just as they were. So a body on a tether was lasting the whole time. The outing can be undone.

No part of you floats off. 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 ledger on every tick. A mark that never changes carries no news. Draw it as a phone line with nothing on it but the dial tone. In fact any lasting join falls into a repeating pattern, so none can carry a message that varies.

"Yeah, but then the cord is useless."

It holds you and your body together as one lasting thing. That's its whole job. It's the most boring phone line ever installed, and its entire conversation is "beeeep."

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 ledger, and an answer that comes back. It's the same kind of act as counting back to a page of your life in Step 2. And a reading aimed at a place needs an address for the place, the way Part 3's two golden fences gave every spot on a road a name of its own.

Zoom out. Step 4 is done. A steady tether joins you to the shared field, the body stays fully itself, no part of you floats off, and nothing comes down the cord, so the view is a reading. Next, and why: the field has others in it, and the tether can come off.

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 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. (Think of two people at a door, both saying "after you." Nothing moves. That's a silent tick.) 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 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. (What happens at death is in Part 3.) What switches a tether on and off is the step still being worked out.

People also describe tunnels, a bright light and beings of light. The exact results have no cause to give for those, so this post gives none.

Coming back whole. Take the tether off, and both ends are still lasting: the body, which never stopped lasting, and the field. 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.

Zoom out. Step 5 is done. Meeting goes by fit, all or nothing. When the tether comes off, both ends are exactly as lasting as before. Next, and why: that's all five. One breath, and then you can go back to your day.

The whole trip, in one breath

A near-death experience is a mind letting go of the body while the body still holds on. The body's input falls almost to nothing, and you don't: you're a rhythm that keeps itself going by writing its own record. Your rhythm and the length of your record are the address of every moment you've lived, and with the body's pushes gone, the count back lands exactly. So your life flashes by, every page one count from now. The arrow of time you feel shrinks in exact proportion to your link with the body's busy activity, so time stops. A steady tether joins you to the shared field while your body stays fully itself, so you look down on it, and nothing comes down the tether, so what you see comes through a reading. Meeting others goes by fit, all or nothing. And when the tether comes off, it comes off clean.

Why exactly when the body lets go? Because the pushes that spoil the count and the link that carries the arrow are the body's own. When the body lets go, both go.

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

(The Ledger would like you to know that it noted every page of this post as well. It's ready when you are.)