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Scientists can erase memories now… would YOU?! - Video học tiếng Anh
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Scientists can erase memories now… would YOU?!
Scientists can erase memories now… would YOU?!
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Untertitel (56)
0:00
- So I'm in a new sci-fi film about erasing memories.
0:04
It's called "Recollection."
0:05
I'm even on the poster.
0:07
But this all made me wonder,
0:08
is memory erasing technology actually possible?
0:11
Well, here's the thing.
0:12
It feels like your memory works like a camera.
0:13
Experiences get saved to some master hard drive
0:16
until you press play and watch it back,
0:19
just as they originally happened.
0:21
But this isn't how your memory actually works.
0:24
A memory is really just a pattern of neurons
0:26
firing in specific sequence like a constellation.
0:29
And every time that pattern fires their connections
0:31
get a little bit stronger.
0:33
It's like a path through tall grass.
0:35
It first time you walk through, you've barely made a trail,
0:38
walk the same route a few more times,
0:40
and now you've worn a real path.
0:42
Now you've made a memory. Here's where it gets weird.
0:45
When you wanna recall a memory,
0:47
your brain has to re-walk the path.
0:50
And to do that, sometimes it has to physically rebuild
0:52
those connections between neurons.
0:54
That means every time you remember something,
0:56
you might end up changing it slightly,
0:57
and the next time you recall it,
0:59
you're actually only remembering that new version,
1:01
not the original memory.
1:03
That means there are these brief moments
1:05
where a memory's vulnerable to being changed.
1:07
Scientists call that reconsolidation.
1:09
Neuroscientist, Steve Ramirez,
1:10
has used this to do something wild.
1:13
He tags specific memory cells in a mouse's brain
1:15
with these light sensitive proteins,
1:17
then fired a laser to activate the positive memory cells.
1:21
He was able to overwrite the negative memory,
1:23
and replace it with a happier one.
1:25
In humans, researchers have tried giving people
1:27
beta blockers.
1:28
It's a kind of heart medication
1:29
right as they recall a traumatic memory.
1:31
It's still experimental, but that drug messes
1:33
with the memory rebuilding step
1:35
and sometimes loses some of its emotional pain.
1:38
But researchers have also found that our memories
1:39
are connected to lots of other things in our brain.
1:42
It's all interconnected.
1:44
So if you delete a memory, what else might go with it?
1:47
The film "Recollection" asks if you could erase
1:49
your worst memory, would you?
1:51
What do you think?
1:52
And if you want to see me in a movie,
1:54
search for "Recollection" online.
1:56
Oh, and follow me for more cool science videos.
