Two points I would make. First, I don't accept that the world is a determined, the physical world is a deterministic system. I think quantum theory has suggested otherwise. The more normal interpretation of quantum theory is just that on the very small scale, how a fundamental particle will behave is not predetermined. The very attempt to suggest that certain experimental results have the consequence that our intentions don't affect our brain events depends on a certain kind of evidence is what subjects tell us. And we believe that evidence because we believe that their intentions caused them to tell this. So, the only way of proving that your intentions don't cause your brain events is by believing certain evidence, which depends on the assumption that your intentions do cause your brain events. So, I regard this as a self-defeating program. source Unverified