You can explain it as a biochemical reaction in neurons, but this explanation won’t do the complexity justice. It’s like describing Facebook as a bunch of transistors in a data center rapidly switching each other on and off. It’s a valid explanation but it’s useless to understand the implications, because the interesting properties come from the interaction of its components, not from the properties of the components themselves.
This phenomenon is called emergence, and pops up everywhere in nature. Here’s a good video with a lot of further reading in the description: https://www.youtube.com/watch?v=16W7c0mb-rE
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