Brain Scanners Can See Your Decisions Before You Make Them
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Link to a PDF outlining the study, with graphs and methodology: [http://www.nature.com/neuro/journal/v11/n5/suppinfo/nn.2112_...]
Regardless, I don't see how this particular experiment threatens the idea of free will. It found that there was a disconnect between the moment that a person made a decision -- subconsciously -- and the moment in which they became aware of their decision, or "decided to make a decision".
Also, the decisions being made required no consideration on the part of the subjects, which I think is an important factor when talking about free will. The test subjects didn't have to consider the consequences of their decisions before making them; they simply pushed a button with either their left or right hand.
It was probably a great choice for their careers.
Cold readers can too. OMFG!