The wonderful weekend edition of The Financial Times reviews three books on the neurophilosophy of free will.
Money quote:
Two neuroscientists working in Australia have taken Libet’s discovery one step further. They found that, when asking people to choose to move either their left or right hands, it was possible to influence their choice by electronically stimulating certain parts of their brains. So, for example, the scientists could force the subjects always to choose to move their left hands. But despite their choice being electronically directed, these patients continued to report that they were freely choosing which hand to move.
So not only is your steering wheel not attached to anything, but if your car was being steered by someone else by remote control, you would not even notice. Every time it turns left, you just move your toy steering wheel and think, ”Ah yes, I want to turn left.”
Discoverers and Discoveries 