You think to yourself, “I am thirsty.” You then decide to get a drink. Obediently, your hand reaches out to grab a glass of ice water. How did your thoughts produce this motion in the physical world?...

You think to yourself, “I am thirsty.” You then decide to get a drink. Obediently, your hand reaches out to grab a glass of ice water. How did your thoughts produce this motion in the physical world? What sort of links in the causal chain run from your thoughts to your body’s muscles?