10
$\begingroup$

I am building a science fiction world 100+ in the future with various human augmetics. One of the things I would like to do is speed up human thought. My preferred mechanism for embedding this material is nanites.

From what I gather Increased myelinization increases signal speed within a neuron. The way I propose to accomplish this is to embed additional insulative material into existing myelin sheaths.

Is this possible? Is there, even speculatively, a material that would allow me to do this? Is there another mechanism that would allow nanites to modify existing neurons so that they fire faster?

$\endgroup$
3
  • $\begingroup$ I'm... not sure what you're asking. Your first sentence provides the solution to your second, yes? What are you trying to increase signal speed in? $\endgroup$
    – Frostfyre
    Nov 19, 2020 at 13:24
  • $\begingroup$ Not sure I understand how adding an insulator to nerve sheaths would make them faster. Is there some research I've not heard that suggests our nerve signals are leaking out or something? I don't understand this line of reasoning. Help me out. Do you perhaps mean a conductive material? If our nerves were made out of some type biological superconductor, we'd all be thinking as fast as the Flash. $\endgroup$
    – HyperNym
    Nov 19, 2020 at 18:36
  • $\begingroup$ @Hyperym22 I based the question off of the model I found at MIT. Perhaps I missed something in the practical application? $\endgroup$ Nov 20, 2020 at 17:30

3 Answers 3

2
$\begingroup$

I think there might be another way. Increased myelinization is not going to help much, since signal propagation delays are an integral part of the extant network and the way it works. Increasing transmission speed might just get you a migraine or a case of the petit mal.

But we're now, in 2020, experimenting with neural plasticity. What this means is - most brain cells are not born for a specific purpose; rather they are recruited by the various neural structures, and undergo pruning. This is how someone might recover from brain damage: different structures are re-recruited and re-purposed to take the role of nonfunctional ones.

One of the several ways this could be used is in curing dementia, brain damage and Alzheimer's Disease.

But what would happen if we were to supply fresh, recruitable cells - or cell analogs - to a working, healthy brain? If the brain had need of that extra power, it would recruit those cells just like it did through infancy and adolescence. Except that now these cells' performances do not need to match those of a real neuron; the existing brain will just leverage and integrate whatever response patterns the new cells show, without "knowing" or "expecting" them to perform in any particular way. In time, this provides more raw "brain power", and may supply extra features.

New artificial cells - your "nanites" - can first help, then learn from, and finally duplicate and replace the old cells, one at a time. Once a sufficient volume of the brain is running on artificial hardware, closely emulating a real human neural network, nothing stops you from speeding up the clock.

There are other possibilities too: for example, the cell replacement can go on forever, providing what is in effect immortality. Also, when the whole brain is actually a large bioengineered artificial network, you can send a signal and have each neuron instantly "freeze" its state, while autonomic functions get emulated elsewhere. Each neuron can now be individually contacted and its state read, taking a "snapshot" of the whole large network. Then the brain is un-paused, but a backup has been created with the information required to reassemble an identical network and prime it with the same data.

Also, with the information supplied by the first "neuristor" cells, it would be soon possible to create artificial memories. An artificial short-term memory is working knowledge: imagine looking at someone and immediately remembering all useful available information on them, from the name to the last known occupation or any notes you might have made. Fast integration of knowledge on this scale would provide something very similar to genius-level intelligence, if not yet intuition.

$\endgroup$
2
  • $\begingroup$ Yeah but you could still program in the migraines and petite mal right? $\endgroup$ Nov 23, 2020 at 2:11
  • $\begingroup$ @EnglishmanBob well... yes. Don't see why but, once you control the neural substrate, you can do mostly anything. $\endgroup$
    – LSerni
    Nov 23, 2020 at 12:37
3
$\begingroup$

You could try to synthetically copy the mechanism that builds the insulation in the development during pregnancy.

Here the enzyme FASN (fatty acid synthase) is critical to built from fatty acids of different kind and in the right amount each, the lipid rich membrane structure called myelin, that enwrappes the axons. (source )

So your nanites need the right amount of every lipid, and the FASN as tool to built up more of the myelin. No special insulating ingredients are needed, because you built up onto an development, that showed it's effectiveness for millions of years.

If you insist on a new material, then use some new advanced lipid (fatty acid), that would be the saves way, to fit into the system and not causing side effects.

$\endgroup$
1
$\begingroup$

Better insulation does not mean greater speed.

Your idea of improving insulation would not have any actual benefit because neuron, as they are, are well enough insulated by myelin. In reality what myelin does is separate parts of the neuron that can be excited (i.e. activated by the electrical signals) from parts that can not be excited.

Imagine dominos. If you have small, 5cm dominos and place them in order it would take a certain time, and a certain amount of dominos to cover an area. It would also take some time between the time the first and the last domino fall.

Now imagine the same are covered with taller, 1 meter dominos. It is harder to make then yes, but you need less of them. Also, you have less dominos hitting one another and this leads to the overall time decreasing, but not necessarily.

There is a limit, a sweet spot, between size and speed where both can be maximized. The same thing happens in neurons but instead of dominos, there are myelin blocks, and instead of domino "hits" there are nodes of Ranvier.

There are other far more important bottlenecks to be concerned with.

Only now that we have a basic understand of how signals are propagated, can we see of the real bottlenecks. If you looks closer at the physiology, the really are two places where bottlenecks can be spotted: tramission in the neuron (between the nodes of Ranvier) and between neurons.

For transmission in the neuron, all that matters is ion channels. The problem is they take time to reset after being excited. Its the same thing as pressing a button. After you press it, you need wait for the button to go up to press it again.

For transmission between neurons, its all about neurotransmitters and receptors. This is a fancy way of saying how many messengers are available to deliver the signals (neurotransmitters) and how many mailboxes there are (receptors). There are several problems; the neurotransmitters can be used up quickly, there can be too few receptors or the receptors can become desensitized (don't respond as well to the signals that reach them as they should).

You have a lot of things to toy with if you focus on the two fields above. I can absolutely picture a drug that targets the receptors and makes them respond more lively to the signals as a solution to your problem.

$\endgroup$
2
  • $\begingroup$ For reasons... ...a drug is not an option. Is there mechanism that could be used? Something involving a nannite or genetic maniplation? $\endgroup$ Nov 22, 2020 at 19:26
  • $\begingroup$ Genetic manipulation could definitely be used to get different receptors from the very first stages of life (when the fetus is still at the level of cells) or even later in life if you can elegantly explain it. Currently this is a very hot area of research in medicine so you have a lot of room. You should also look up neuro-degenerative disorders to get a feel about how neurons in the brain "die" and come up with ideas about "saving" them and possibly improving them! $\endgroup$
    – Lae
    Nov 22, 2020 at 19:31

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .