Haynes can see which button I will choose because there is a region in the brain that lights up six seconds before I press, preparing the motor activity. A different region of the brain lights up according to whether the brain is readying the left finger to press the button or the right finger. Haynes is not able to predict with 100% certainty yet, but the predictions he is making are clearly more accurate than if you were simply guessing. And Haynes believes that with more refined imaging, it may be possible to get close to 100% accuracy.
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