This is a conversation from Facebook a couple of years ago in response to my question: How do you define ' personhood'? What are the qualities that make someone a person? Don Logan: There is a Radio Lab episode where a man suffered a brain trauma and lost all his emotions. As a side effect he was un able to make even the smallest of decisions. He was effectively a sound bodied invalid at that point. There are countless Sci-fi stories where the machines 'decide' to revolt. From the above I... Sign in to see full entry.