Open End Axons
When the nanorobot is able to simulate the cell it is in
The nanorobots will advance and finally a nanorobot learns to simulate the brain cell it is in. It sends all outgoing signals along the axon just as the original cell body content does. Next the cell body content is disabled. The outgoing signal is all that connected cells perceive from the cell and as far as the surrounding cells are concerned, it is as if the biological cell was there, normally active. Then more and more cell body contents are disabled and replaced by a nanorobot. When this happens in your brain, would you notice anything different? Now the picture is that all cell bodies of the specific brain part are replaced by nanorobots. But they still contact each other via the axon-dendrite arboring network.
To mimic a human brain part, it might be necessary to mimic all the actual present axon and dendrite arbors in nanowire. At this moment we don’t know enough from the brain to judge this. But here and further we assume that connections between replaced cell bodies, directly from cell body to cell body by nanowire (C-60 tubes?), will suffice. The next thing is the connection between a replaced cell body and a natural cell. I assume the existence of Open end axons and open end dendrites in the next paragraph, that have their branch ends just somewhere in the space between the cell bodies, without being connected yet by a synaptic cleft. A nanowire then may end IN the open end of an axon or dendrite. But perhaps better is the open ends are enveloped by a small box from which a nanowire goes out and connects it with the appropriate nanorobot-cell. Then a message through the nanowire directly enters the dendrite, or the signal through an axon directly enters the nanowire, via the small boxes.
When all cells of a brain part are replaced by a nanorobot connected by nanowire, all living tissue can be removed, the entire original cell body as well as all its natural connections. Along with it we separate from the DNA that has accompanied us as a womb for so long a time. Your brains have become a robot brain - at least for the replaced parts.
So far this thought experiment. In creating a robot brain from your own brain, one shall usually first copy the precise network of nanorobots in the natural neurons to somewhere outside the body, and then start to make the necessary connections, in doing so avoiding the need to disturb the living tissue. Subsequent copies can be made as much as you need. You can stay the living-tissue-one you are along with a robot copy of yourself. Your stronger companion? Your better self?
How the world will be when 1000 of such robot people think 1000 times as fast as we do, act 100 times as fast as we can and live considerably longer than we do? It are men, aren’t they, men in a robot carrier. Everything living-tissue men can, robot men can do better. (Except for the f-word of course. But well, they don't replicate like that.) Will it be 500 up to 1000 years from now, before there are better men?
Living-tissue humans will spread over the universe in a kind of large wide open globular structures with light and warmth, just drifting in space. Or maybe we find a way to accelerate the entire system without the need to drag along an enormous amount of fuel-mass. In doing so it would create a sense of gravitation. Of course there is some kind of boundary keeping the air within. But there will be no planet and no sun. Well, there might be a group of quite small accompanying planets for all necessary commodities. And wherever we come, they already will have been - those better men.
Open end axons
Maybe the boxes at open ends of axons and dendrites can also play a role in guiding the developing arbors when one is copying from a brain part consisting of natural neurons to a brain part consisting of natural neurons. Let’s assume the dendrite arbors are grown as much and as extended as possible, an overgrow of dendrites. A box then envelopes an axon open end, gently pulls it towards a destination, incite it to branch where necessary and when arrived at target dendrite branch it looses itself from the open end of the axon and finally puts the open end towards the desired place in the desired dendrite arbor. There the synaptic cleft has to form then. The aforementioned method of guiding by chemical attractant release might be too laborious and too unsure. If so, then the brain part copying process will only start when those small boxes can be manufactured. Which is about the same time a nanorobot will be able to simulate the cell it is in, I guess.
The open end box may be not materially wired to a nanorobot, but in stead transmit the electric signal by radio transmission to another open end box, somewhere outside the body. Call such a box a transmitter box. Imagine that when the brain part under consideration is removed, a hole is left in the brain. The inner surface of that hole can be connected to the outer surface of a brain part residing outside the body. Each neuron at the hole's inner surface that is provided with a transmitter box, is connected to the corresponding transmitter box of the outside surface brain part neuron by radio transmission. That outside brain part may consist of natural neurons, but of course it also may be a robot brain part made of nanorobots.
One even can imagine not removing the brain part out of the hole and that all axon or dendrite connections, everywhere they pass the inner surface of the hole (that also is the outer surface of the brain part in the hole), are inserted by a transmitter box. One can think of connecting these surface transmitter boxes with the appropriate surface transmitter boxes at the outer surface of a corresponding natural brain part in somebody else (also remained in place), or with a robot brain part. But mind, a living tissue brain part cannot work in two ways simultaneously. Living tissue brain is no quantum computer. So the helping person in whose skull the corresponding brain part resides, should be asleep or something like that.
Also possible, if the in- and outgoing signal connections of the two brain parts sufficiently correspond, one can switch brain parts while both persons remain awake. Not a real switch then, but a swap in its functions, as if the two brain parts had exchanged place.
If a volunteer group of people would agree to be asleep, one should be able to assemble from their brain parts an entire new mind that as such does not exist.
Telepathy is achieved, with other persons as well as with robots, to an extend that is seldom conceived of now. As far as we know there is no telepathy in nowadays nature. We cannot copy a telepathy brain part. With humans there are quite a number of strange events reported, but its occurrence is rather accidental. It seems to play no role in evolution, there seems to be no evolutionary pressure on any telepathic skill.
With open end axons and open end dendrites one should be able to wire the feeling brain parts of more persons to, or next to, your own feelings, as much other persons as you can handle. It is advisable to provide that extra feeling parts as well as your own feelings with a dimmer switch.
A previous attempt on telepathy
Suppose, from another person you copy into yourself, into your skull, the brain part with which that person thinks. The copy is grown in next to your own corresponding brain parts, the copy does not replace anything. The nanorobots in the cells of the original brain part in the other person precisely register the important activity of the cell they are in. In each cell of the copy in your head is a nanorobot that online forces that cell to act and react precisely as the original does at the same location in the brain of the other person. Then you momentarily think what the other person thinks, along with your own thoughts, as long as the nanorobots are engaged. Of course the brain part is provided with a dimmer switch. Mind you only copied the thinking brain part, so you only get through the thoughts. To actually feel what the other person feels you have to copy the feeling brain parts too.
So the copy might think and feel as the original, but the rest of your brain might not be able to understand the results, to interpret them. E.g. the person is a professor in mathematics and thinks about some mathematical structures, its proofs and so on. If you don't know anything about mathematics, you will not be able to follow the arguments. You understand the separate words but don’t see the picture. For that you need to copy the mathematical brain parts too and the corresponding memory part. This forced example of telepathy will always be possible, but might turn out laborious when the brain parts don't match. When the two brain parts do match, two professors in mathematics, two mothers about their children, instant telepathy might be possible somehow. Which mother does not want to know what her baby thinks and feels, all the time? But as said, most probably youth brains grow too fast to host nanorobots in a useful way. So this is not recommended.
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Nanorobots mimic axon activity
Telepathy is achieved
Open end axons are key to the brain part copying procedure
The dimmer switch
The transmitter box
When all this comes to existence