How not to answer interdisciplinary “Why?” questions

The book under review tries to link the economic concept of “reward,” or, more accurately, “capture rate,” to the experimental literature of various neuroscientific quantities dealing with motor control. But this reviewer argues that such a linkage requires a richer language of quantification than the book actually affords: a language not just of “greater” or “less,” but of how much greater or less. Without such a methodology, the arguments here cannot be persuasive.