Neuroscientists are getting better at reading minds

The interesting results are mentioned here.  I found myself wondering what would happen if you told the people what the brain scans predicted they would do.  If you asked them again what they thought they would do after they were told what the brain scan said, would their own predictions become more or less accurate?  Would they still be less accurate than the brain scan?  Would telling them what the brain scan predicted make the brain scan less accurate?  I know I'd try to use a brain scanner like this to see if it predicted my doing anything I wanted to avoid doing, so I could try to find some better way of getting myself to not do it, but I have no idea whether I'd be successful at that.  Clearly an area where lots of additional research is needed!