Seth Lloyd
(Research Laboratory of Electronics at MIT)
A Turing Test for Free Will

I show that the theory of computation implies that even when our decisions arise from a completely deterministic decision-making process, the outcomes of that process are intrinsically unpredictable, even to - especially to - ourselves. I argue that this intrinsic computational unpredictability of the decision making process is what give rise to our impression that we possess free will. Finally, I propose a 'Turing test' for free will: a decision maker who passes this test will tend to believe that he, she, or it possesses free will, whether the world is deterministic or not.