[quote=@ImportantNobody]
<Snipped quote by Dymion>

I imagine all it's matter is sentient rather than creating neurons. Although you could just say all of it's matter is comprised of a nervous system depending on your outlook.
[/quote]

Well, what I think of to describe it would be:
- If it's purely biological: BLACKLIGHT
- If it's nanomachines: Nanomachines!
- If it's a hybrid between the two: Grey Goo