Professor Matthew Kiernan

It needs a blood supply.

Absolutely.

So we're producing that.

Endogenously.

So inside our body, yes, we are producing it.

And I think the other thing to say is the brain is a network.

So all of the brain is working, communicating with itself all the time.

We used to think that, you know, one part of the brain might be memory, one part of the brain might be vision.

But that was because we studied neurology on the basis of a deficit, like a stroke or an injury.

In fact, okay, a lot of the neurology understanding came from major wars.

So particularly World War I, bullet wounds in the back of the head, people would understand that's the cerebellum.

And so it was looking at deficits.

And one of the great neurologists is a guy called Charles Miller Fisher.

And he said, you learn neurology stroke by stroke.

So you see a patient with a stroke, you see what part of the brain is affected, and then you see what the manifestation is that, and then that's your understanding.

But now we see the brain more as a network.

So all of these parts of the brain are communicating through these nerve fibers.

And when the blood supply is affected, they start not working as well as they should.

So the speed of the signal getting through is less.

Sometimes they die.