This is from 2008, but still relevant. If you run across more recent articles, please post them in the comment field below. Of course, a seven-second delay between brain activity and action does not necessarily imply lack of free will, I guess. It only implies a seven-second delay.  - DG

Brain Scanners Can See Your Decisions Before You Make Them

You may think you decided to read this story -- but in fact, your brain made the decision long before you knew about it.

In a study published Sunday in Nature Neuroscience, researchers using brain scanners could predict people's decisions seven seconds before the test subjects were even aware of making them.

The decision studied -- whether to hit a button with one's left or right hand -- may not be representative of complicated choices that are more integrally tied to our sense of self-direction. Regardless, the findings raise profound questions about the nature of self and autonomy: How free is our will? Is conscious choice just an illusion?

"Your decisions are strongly prepared by brain activity. By the time consciousness kicks in, most of the work has already been done," said study co-author John-Dylan Haynes, a Max Planck Institute neuroscientist.

Read the rest of the article on Wired.com.

Here is a follow-up article to this one: Is Free Will an Illusion?

And here is a link to the abstract: Unconscious determinants of free decisions in the human brain