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You don’t need to “tie a specific neuronal activity to a thought or memory” to know whether a set of neurons can have humanlike memory or emotions. We know that specific brain regions are required for specific brain functions. Most famously, we know that hippocampi are necessary to form new episodic memories due to Patient HM. This organoid does not have anything like these necessary specific brain regions, so we can be pretty sure they don’t have these human brain functions.
Also, I’m not sure what you mean by “tie a specific neuronal activity to a thought or memory” We’ve known examples of single unit neural activity being correlated with thoughts for many years, see place cells and Grandmother cells. Really, the whole field of systems neuroscience studies this at some level. And I think that field has made some progress.
hitting refresh in firefox reader mode works for me.