@Fil Albuquerque,
The research you talk about is of the "push a button" category where scientists can tell ahead of you committing to the left or right button seconds before you're conscious of your choice.
Committing to a choice is a staged process, during which you first establish what you want to do, then you consciouly check with different 'committee members' (e.g. the moral department, the joker, the smart guy) that this is really what they all agree and commit to do. There can be several iterations, several version of the draft dcision. That's one of the things conscience is made for: pull together all relevant variables, all considerations and information that may have a bearing on a choice. This process can take from a second (in the simple case of chosing between two buttons) to... well, quite a while in more complex cases.
During this process, in simple cases (e.g. press the left or right button, the likelihood of the ultimate choice can be perceived by the scientists scanning your brain as increasing steadily seconds before the conscious commitment is made, plus the time necessary to perceive consciously that the choice has been made, and look up the time at the clock... Most studies claim to predict choice by half-a-seconds or so. Some studies have tried to predict several seconds in advance but their success rate is much lower, at 60%, which is slightly better than tossing a coin would yield...