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Worth mentioning: there were three research groups trying to emulate C. elegans, and they all seem to have stalled [1].

[1]: https://www.lesswrong.com/posts/mHqQxwKuzZS69CXX5/whole-brai...

I knew OpenWorm was struggling, but didn't know there were other unsuccessful projects. If no one can simulate C. elegans, despite all that's known about it, there's a fundamental lack of understanding so great that there's no surprise AI is stuck.

There was an attempt, funded at US$3bn, a decade ago, the Human Brain Project, to try to do something similar for the human brain.[1] That seems to have just turned into a funding vehicle for research in related areas.[2]

[1] https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC3861343/

[2] https://www.humanbrainproject.eu/en/follow-hbp/news/2022/02/...

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