I think the article title is somewhat misleading. What they might found is not "part of the brain responsible for free will" but, rather, parts responsible for

I think the article title is somewhat misleading. What they might found is not "part of the brain responsible for free will" but, rather, parts responsible for perception of volition will and agency. Those are rather different things. The "free will" thing being a whole tougher nut to crack and, frankly, maybe even pointless to pursue at this stage of neuroscience development. However, quest for neural correlates of volition and agency is extremely useful and better understanding could help managing catastrophic injuries.