Alexander George has made a distinction between the brain making a decision and "I" making a decision (see http://www.amherst.edu/askphilosophers/question/636). I'd like to know what exactly he means by "I" if not the brain. Unless the flesh of our bodies thinks, then it seems perfectly acceptable, if not more accurate, to say the brain makes all decisions. What more can he be referring to that is not contained within the brain?! Not only that, it seems that the brain is doing all this decision-making automatically since there is nothing outside our own brain that we can use to control it.
I believe a good and simple answer to the original question, (to paraphrase) "How am I responsible for my decisions when it's my brain that makes the decisions"? is to say that the "I" IS THE BRAIN.