This question has been in my mind for years. Where I used to live, there used to be a forked path that led to my car. Both paths were the same in terms of length, and both offered no additional benefits in terms of travel time or inconvenience. Both paths were exactly the same.

Think of a diamond, and you cannot cut straight through the middle of it, but must walk along side one of the sides. One vertex has me, then the opposite vertex has my car. I choose left, but why? Or, I choose to walk right, why?

There was this seminar I went to years back when I was at NASA, a neurobiologist who explained how our eyes and its visual acuity has an influence in decision making processes. When I think of this problem, I always think back to that lecture (although I barely remember most of the details about it now).

But what if our eyes lacked that bias? What exactly goes into a bias towards the left or right when both paths are opportunisticly the same?