Washington University in St. Louis reports that we pay closer attention to objects near our hands. Their working theory is that we evolved this way because we need to know how to handle or protect ourselves against whatever is closest to our hands, and would be less concerned with things that were farther away.
I don't know if this will bear any relevance to visual computing, but they may want to consider it as a way to improve processing.
I disagree with their "hands on steering wheel may keep eyes on road" theory, though. It's a bit of a leap to go from paying attention to the steering wheel to looking at the road as a whole.
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