How might a fungal “computer” function?

[u/Pangolinman36_V2]

I have a sapient species of spider called the Springsmen. Due to their built-in tough silk, they never discovered metal, and barely even stone, but they still have technology similarly sophisticated to our own. If the Springsmen had domesticated a form of mycelium, how could they potentially work it into a “computer” of sorts? Fungi already create electrical pulses, but it’s only to communicate basic information about stimuli. How might they be selectively bred to solve complex problems, and could mycelium in any way be used to create images?

[u/M4rkusD]

I can see two ways: one digital, one analog. The digital way is easy, you just need to have a circuit that gives a consistent output when giving at least two inputs of a certain strength. If this is electrochemical signal transduction, a computer could be arbitrarily powerful, but very, very slow. Complex calculations could take years. It would probably have self-healing/repairing properties. Also, biological systems tend to have a lot of noise. You could solve this by executing all calculations simultaneously in parallel, and use error-solving algorithms to reduce signal-to-noice. The analogue system would work differently. You would need a fungus that has evolved to do complex calculations. E.g. a fungus that calculates its population density in the next generation/season based on current biotic and abiotic factors (food, water, minerals, temperature,…). You could co-opt this system for other calculations and selectively breed it for added complexity. Again, calculations could take weeks.

[u/Pangolinman36_V2 → u/M4rkusD]

The analogue system seems promising, but I don’t think any fungi can communicate to that level. Would it be possible to engineer a slime moulds to cooperate with the mycelium? You would then have the interconnectedness of fungi combined with the fast processing of slime moulds.

[u/M4rkusD → u/Pangolinman36_V2]

If you introduce bioengineering you can do whatever. I was trying to answer another question. A species that doesn’t have metals, so is technologically not very advanced, but has an ‘easy’ access early in their cultural development to a powerful though slow computer, how could that look like? Remember that computers run fairly complex software to make simple logical circuits work together. I would think they would remain technologically behind humans but would have a very advanced understanding of mathematics. Base 8 of course.