For example, if I promise you one thousand dollars to turn to this page, you will probably choose to do so, and you will succeed. If, however, I prom… - Martin E P Seligman

" "

For example, if I promise you one thousand dollars to turn to this page, you will probably choose to do so, and you will succeed. If, however, I promise you one thousand dollars to contract the pupil of your eye, using only willpower, you may choose to do it, but that won’t matter. You are helpless to contract your pupil. Page turning is under your voluntary control; the muscles that change your pupillary size are not.