The article really doesn't go into what sorts of clues the subconcious is picking up on. They just used blue left and right arrows to introduce "mutually exclusive" options. Supposedly, the clues are something obvious to the primitive brain like "big noisy beast to my left" or "dangerous drop-off to my right" . . . or maybe more subtle things, can't think of any examples. What would the aboriginal tribesmen sense in a coming tsunami that the regular accountants, engineers, etc could not? Some faint sound, changes in the wind, air pressure?