Name: 脳科学者だけど質問ある？ | Tech Support
Uploaded: 2022-04-28T17:45:05.000Z
Duration: 11 min 10 s
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And I just watched that episode of Black Mirror, which is fantastic isn't it where they have a device that can harvest your memories kind of like meet the Robinsons and it seems hella advanced.

I think in some limited way we can implant new memories.

People can reliably misremember what happened if they're told a plausible story, But we can also do it more directly.

Hypnosis is real and through hypnosis you can induce false memories.

Watching ton of nineties music video today.

And I'm wondering where in my brain I have stored all of these really non essential lyrics and if I can clear that space with something useful now, I don't know what's non essential about nineties music videos.

So I don't want to devote that space to anything else at all.

We seem to be able to remember an enormous amount of information.

The adult human brain has about 90 billion neurons.

It has about 1000 times more connections.

Which means that if you counted one connection every second, it would take you about three million years to count them all.

There's a lot of connections in the brain.

And if you think that the memory is just a particular pattern of connections distributed among a large number of neurons, the number of memories that you could potentially store in the brain is infinite, bohemian mayas.

Is it possible to punch yourself in the brain so that you just forget certain memories and stuff like that?

I wish it was actually forgetting is very adaptive.

It would be terrible to remember everything.

In fact some people with really, really good memories have a lot of problems in their lives because they simply can't forget.

So is there a way to just get rid of particular memories and we're not quite there yet.

But there's some interesting work in just with mice at the moment that shows that it is possible to eliminate certain memories from mice.

Whether that will also apply to humans or not?

Is a long way down the road but don't punch yourself in the brain.

It says old people thinking that millennials use social media because you get a hit of dopamine when you get a text.

Dopamine this chemical in the brain that's often associated with rewarding stimuli?

Does that really release dopamine in the brain?

It's a pretty good guess if we find something like that rewarding that will involve the release of dopamine Stefan Conrad asks, is it possible to read our brain?

It's becoming possible in the sense that we can record activity from the brain now using a variety of different methods were not in some weird science fiction scenario where I can point something like a hair dryer at your head and know exactly what you're thinking.

But in a more constrained situation where the kinds of things that you might be perceiving is restricted, then yeah, we're beginning to make progress.

And another way this is really helpful is we can begin to read from the brain movement intentions.

And this can be extremely helpful for people with paralysis because we can start to build what are called brain computer interfaces and use signals directly from the brain to control arms of control robotic limbs.

And this is a a great example of why brain reading is still quite limited on the left.

There's a duck and on the right there's a reconstruction and it doesn't look that much like a duck yet actually.

And this guy Yuki comma Tommy, he's actually he's one of the world's leaders in this area actually.

So can actually has done some brilliant work on decoding people's dreams.

Because if you can decode the brain while people are awake, you can also apply the same algorithms while people are dreaming and begin to generate all these weird patterns of what the perceptions are that the brain might be generating while you're dreaming.

KT 80 K asks, is there a part of the brain that senses a bad decision and tells you not to do it.

It gets that one of the central issues in neuroscience which is free will and there are different parts of the brain that are involved in the execution of voluntary actions And in the inhibition of voluntary actions.

There was a very famous case, a guy called Phineas gauge in the 19th century was working on the railroads and a huge piece of metal went straight through his frontal lobes.

The first miracle was that he survived after he recovered, he seemed to be fine, but it rapidly became clear that he lost all his ability to monitor and control and withhold his actions and he behaved, started behaving very inappropriately.

What happened to him was the loss of the part of the brain that helped exactly this question that senses a bad decision and tells you not to do it.

We've all been told to take a deep breath when stressed.

So what is the neuroscience behind why this quick help so much?

Well, there's a simple answer to this which is that the brain needs a lot of oxygen to function properly.

So if your start of oxygen taking deep breaths helps.

But there's also a more complicated story which we're only as neuroscientists beginning to unravel.

We've known for a very long time now that decision making, Doing the right thing at the right time is very strongly shaped by the state of our body at a particular moment and we call this emotion in another way.

So we won't make the right decisions unless we have the correct kind of an appropriate emotional response as well.

But sometimes our emotional response can be too overpowering and then we'll make wrong decisions.

So taking a deep breath, might just readjust this balance between what we're thinking, what emotions we're feeling and the state our body is in so that our brain activity in our body can become more in alignment is face blindness a real thing or just an attention seeking thing, it's a real thing.

There's a condition called process of nausea, which is the inability to distinguish between faces.

What you find is people with nausea, they're still able to identify people, but they do it in different ways.

They're very good at picking up other cues like how somebody walks or what clothes they're wearing or what voice sounds like, but they just cannot recognize faces when you dream.

You dream of things that you've seen and thought about and all that.

So my question is, do blind people dream and if so how good question?

In fact it's not only humans that dreams pretty much every animal with a brain at least with this kind of cortex dreams blind people if they've been blind from birth, maybe they won't have visual content in their dreams but they'll certainly have dreams very rich in other perceptual content and nobody really quite knows what dreams are.

For one idea is that when we perceive the world around us, we have to use these very, very complex models inside our head about what's out there in the world so we can interpret all the sensory data that's coming in and when we dream, we're basically sharpening and improving those models so that they work better.

The next day, a rancher asks can my amygdala like stop, I wish it could be.

Amygdala is a walnut sized pieces of brain very deep inside the base of the brain here.

The amygdala is very heavily involved in fear and anxiety, things like that.

We wouldn't be sufficiently scared of things that should be scary.

So when we were evolving in the african savanna as early humans were doing probably the most important thing is to be scared of the right things at the right time and you need an amygdala to do that.

Do you think Transcranial magnetic stimulation treatment could alleviate ptsD post traumatic stress disorder, panic anxiety or alzheimer's.

Tms is a relatively new method and what it does is it just injects short but very strong pulses of electromagnetic energy into the brain.

You can activate one part of the brain for instance, I could activate the parietal cortex here or the frontal cortex there.

So it's pretty non specific and the long term effects are not very well known.

It may be technique which alongside many others will help us refine new approaches to these conditions.

But by itself it doesn't provide any quick and easy answers.

Is it will it be possible to surgically manipulate specific memories?

One thing is there's more than one kind of memory.

Different parts of the brain are involved in these different ways of remembering things.

To say that we understand any piece of that puzzle works would be would be an overstatement.

But let's just take one let's take autobiographical memory.