Great question — answering as the UphillTech team:
This is all just my personal opinion, which I will eventually back up with quotes. During one scene we see Tony show a 'live holographic feed' of JARVIS to Bruce. JARVIS has been completely designed by Tony, from the ground up. Every single element of JARVIS has been built, refined and perfected by Tony over (we assume) a large period of time. Then he shows a live feed of inside the Mind Stone - its larger, more chaotic, more like a human brain then something artificial. Bruce mentions that he sees signals flying around similar to a human brain. In other words, it seems to be an organic intelligence that we know is manipulative and above all else, dominating. (Hawk-eye) This is where my...
Full answer by davidlumix: https://movies.stackexchange.com/a/33765 (CC BY-SA 4.0).
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