Subjects' brainwaves showed that even if a person never consciously recognized the shapes on the outside of the image, their brains still worked on figuring out their meaning. "There's a brain signature for meaningful processing," Sanguinetti said. "A peak in the averaged brainwaves called N400 indicates that the brain has recognized an object and associated it with a particular meaning. It happens about 400 milliseconds after the image is shown, less than a half a second," said Peterson.
To me, this seems to beg the question of intuition. Is intuition just the brain's unconscious recognition of a subtle visual cue? For example, sometimes you meet someone that just doesn't hit you right. You have no basis for your unease, but later find out he/she was caught stealing or cheating on a test. Perhaps the brain picked up on something and sounded the alarm subconsciously. Hmm... Go Science!