The following Wikipedia link may explain better how Benjamin Libet has conducted experiments to show that our brain's unconscious "decides" for us to do something, before our conscious mind is aware of doing it:
http://en.wikipedia.org/wiki/Benjamin_Libet
Personally, only when I'm doing "mechanical" thinking, like arithmetic am I sure I'm driving my conscious thoughts; otherwise, I seem to think thoughts that seem to "bubble up" from my unconscious. Probably they were primed by something my eyes, ears, nose, taste buds, or skin sent to my brain. This belief goes along with my not thinking we have a dualistic mind, meaning there's no essense of us beyond our brain. Nothing to go to heaven, in effect. It also mean my brain is my own cable tv station.