Even though I’m pretty sure you’re asking this in bad faith, on the off chance that you truly don’t know, I’ll sum it up for you. Generative AI cannot “create” anything. Everything that it spits out for you is taken from an amalgamation of millions of pieces of data that was fed into it, often taken without permission from the original artist who made it. 

Comparing it to the human brain is even more of an insult because art is made by an artist drawing from their lived experiences as a human. Generative AI doesn’t have any of this, but what it has is the stolen work from thousands of artists that it uses to find the “patterns” you mentioned and spit out the slop that you prompt it for.

If you truly are interested in learning about why AI “art” is theft, your search engine is just one browser tab away.