Hey thought i'd jump on this point, its because the human mind is very good at ignoring stuff that isnt important to it, an ai will constantly have the streams of data and as you say become overloaded.
This all comes into the pattern recognition capability of the human mind and its capabality to on the fly 'zone out' things experience tells it is unimportant.
Just my two cents, been lurking for quite a while and thought theres something I think I have insight into. Appreciate all the analysis and info you guys are collating.