[otabdeveloper4]

> I mean a brain is not just neurons with simple connections to each other.

No, it's not. There are many animals that have extremely complex and even learned behaviour that have literally zero neurons.

Clearly "neurons" is an oversimplification just-so story, not a scientific theory.

[adammarples]

Apparently even single-celled protozoa can show learned trial and error behaviour.

[formerly_proven]

Do you consider fungi animals or do you perhaps mean animals that don't have a brain/CNS?

[otabdeveloper4]

Yes, protozoans don't have brains and yet they exhibit complex behavior.