Personally, I think your brain in the future is sending messages back in time to your past brain in order to let you know the decision you'll make.

You know, in theory.

Brainscans of future thought - Boing Boing:

"Researchers using brain scans have shown that decisions are made in the subconscious several seconds before we're even consciously aware of them. Scientists at Berlin's Bernstein Center for Computational Neuroscience used fMRI to watch their subjects' brains as they were asked to tap a button whenever they wanted to. Turns out, the prefrontal cortex lit up seven seconds before the volunteers ever hit the button.

..."It seems that the brain is making the decision before the person themselves," (says neuroscientist John-Dylan Haynes.)"