system
Given the following post, respond as if you're commenting on Reddit:
human
[STARGATE] How Intelligent are the Goa'uld

I mean they're basically glorified slugs aren't they? their brain is has to be the size of a walnut, no? 

I was thinking about it as i watched Ba'al get extracted, i mean in his last moments outside of the host, is he still Ba'al? or just a parasite looking for a host? does this slug have some kind of megalomania, it's own personality? 

or does it all come from the host, does the host provide the mental capacity? how would a brain scan look, would the slug have activity even after symbiosis have been achieved? 

if the mental capacity and intelligence come from the host, why didn't the Goa'uld just nab more clever people for their host? 

Then there's the issue with Anubis, he partly ascended, what happened to his host during the process?
gpt
The slug is still Ba'al.  The Goa'uld will even go so far as to tell you that nothing remains of the host after implantation, but the Tok'ra put the lie to that.  
Still, to the point, regardless of apparent size, the symbiote has a sufficient neural structure to facilitate the typical range of human-ish level intelligence.