Mark Hallett, a researcher with the National Institute of Neurological Disorders and Stroke, said, “Free will does exist, but it’s a perception, not a power or a driving force. People experience free will. They have the sense they are free.

“The more you scrutinize it, the more you realize you don’t have it,” he said.

That is hardly a new thought. The German philosopher Arthur Schopenhauer said, as Einstein paraphrased it, that “a human can very well do what he wants, but cannot will what he wants.”

From a NYT article entitled “Free Will: Now You Have It, Now You Don’t” which I came across via Scott Adams’ blog.