Hacking your memory -- with sleep
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0:00 - 0:03Whether you're cramming for an exam
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0:03 - 0:06or trying to learn
a new musical instrument -
0:06 - 0:08or even trying to perfect a new sport,
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0:08 - 0:12sleep may actually be
your secret memory weapon. -
0:12 - 0:15[Sleeping with Science]
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0:17 - 0:21Studies have actually told us
that sleep is critical for memory -
0:21 - 0:23in at least three different ways.
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0:23 - 0:27First, we know that you need
sleep before learning -
0:27 - 0:29to actually get your brain ready,
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0:29 - 0:31almost like a dry sponge,
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0:31 - 0:34ready to initially soak up
new information. -
0:34 - 0:38And without sleep, the memory
circuits within the brain -
0:38 - 0:41effectively become
waterlogged, as it were, -
0:41 - 0:43and we can't absorb new information.
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0:43 - 0:47We can't effectively lay down
those new memory traces. -
0:47 - 0:51But it's not only important
that you sleep before learning, -
0:51 - 0:55because we also know
that you need sleep after learning -
0:55 - 0:58to essentially hit the save button
on those new memories -
0:58 - 1:00so that we don't forget.
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1:00 - 1:04In fact, sleep will actually
future-proof that information -
1:04 - 1:06within the brain,
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1:06 - 1:08cementing those memories
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1:08 - 1:11into the architecture
of those neural networks. -
1:11 - 1:13And we've begun to discover
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1:13 - 1:20exactly how sleep achieves
this memory-consolidation benefit. -
1:20 - 1:25The first mechanism
is a file-transfer process. -
1:25 - 1:28And here, we can speak about
two different structures -
1:28 - 1:29within the brain.
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1:29 - 1:32The first is called the hippocampus
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1:32 - 1:35and the hippocampus
sits on the left and the right side -
1:35 - 1:36of your brain.
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1:36 - 1:38And you can think of the hippocampus
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1:38 - 1:42almost like the informational
inbox of your brain. -
1:42 - 1:44It's very good at receiving
new memory files -
1:44 - 1:46and holding onto them.
-
1:46 - 1:48The second structure
that we can speak about -
1:48 - 1:50is called the cortex.
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1:50 - 1:54This wrinkled massive tissue
that sits on top of your brain. -
1:54 - 1:56And during deep sleep,
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1:56 - 1:59there is this file-transfer mechanism.
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1:59 - 2:02Think of the hippocampus like a USB stick
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2:02 - 2:04and your cortex like the hard drive.
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2:05 - 2:06And during the day, we're going around
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2:06 - 2:08and we're gathering lots of files,
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2:08 - 2:11but then during deep sleep at night,
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2:11 - 2:14because of that limited storage capacity,
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2:14 - 2:17we have to transfer those files
from the hippocampus -
2:17 - 2:20over to the hard drive
of the brain, the cortex. -
2:20 - 2:22And that's exactly one of the mechanisms
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2:22 - 2:25that deep sleep seems to provide.
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2:25 - 2:28But there's another mechanism
that we've become aware of -
2:28 - 2:32that helps cement
those memories into the brain. -
2:32 - 2:34And it's called replay.
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2:34 - 2:35Several years ago,
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2:35 - 2:39scientists were looking
at how rats learned -
2:39 - 2:41as they would run around a maze.
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2:41 - 2:46And they were recording the activity
in the memory centers of these rats. -
2:46 - 2:48And as the rat was running
around the maze, -
2:48 - 2:53different brain cells would code
different parts of the maze. -
2:53 - 2:56And so if you added a tone
to each one of the brain cells -
2:56 - 3:00what you would hear
as the rat was starting to learn the maze -
3:00 - 3:02was the signature of that memory.
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3:02 - 3:04So it would sound a little bit like ...
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3:04 - 3:08(Bouncy piano music)
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3:08 - 3:12It was this signature of learning
that we could hear. -
3:12 - 3:15But then they did something clever.
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3:15 - 3:19They kept listening to the brain
as these rats fell asleep, -
3:19 - 3:22and what they heard was remarkable.
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3:22 - 3:24The rat, as it was sleeping,
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3:24 - 3:29started to replay
that same memory signature. -
3:29 - 3:33But now it started to replay it
almost 10 times faster -
3:33 - 3:35than it was doing when it was awake.
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3:35 - 3:38So now instead you would start to hear ...
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3:38 - 3:41(Fast bouncy piano music)
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3:41 - 3:43That seems to be the second way
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3:43 - 3:46in which sleep can actually
strengthen these memories. -
3:46 - 3:50Sleep is actually replaying
and scoring those memories -
3:50 - 3:53into a new circuit within the brain,
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3:53 - 3:56strengthening that memory representation.
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3:56 - 3:59The final way in which sleep
is beneficial for memory -
3:59 - 4:02is integration and association.
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4:02 - 4:04In fact, we're now learning that sleep
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4:04 - 4:07is much more intelligent
than we ever imagined. -
4:07 - 4:11Sleep doesn't just simply
strengthen individual memories, -
4:11 - 4:16sleep will actually cleverly interconnect
new memories together. -
4:16 - 4:17And as a consequence,
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4:17 - 4:19you can wake up the next day
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4:19 - 4:24with a revised mind-wide
web of associations, -
4:24 - 4:30we can come up with solutions
to previously impenetrable problems. -
4:30 - 4:31And this is probably the reason
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4:31 - 4:36that you've never been told
to stay awake on a problem. -
4:36 - 4:40Instead, you're told
to sleep on a problem, -
4:40 - 4:42and that's exactly
what the science teaching us.
- Title:
- Hacking your memory -- with sleep
- Speaker:
- Matt Walker
- Description:
-
We've all been told to get a good night's sleep before a test -- finally, here's the reason why. Sleep scientist Matt Walker explains how getting enough sleep affects how our brains store and process memories.
- Video Language:
- English
- Team:
- closed TED
- Project:
- TED Series
- Duration:
- 04:42
Erin Gregory approved English subtitles for Hacking your memory -- with sleep | ||
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Krystian Aparta edited English subtitles for Hacking your memory -- with sleep | ||
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Brian Greene edited English subtitles for Hacking your memory -- with sleep |