Studies on human development have shown that even as infants, we have an approximate sense of numbers and amounts. How does this underlie our ability to perform complex calculations? Stanislas Dehaene explores this question through neuroscience. He has used brain imaging to study how the human mind processes numeracy, as well as language. Through his work he has found brain regions specifically involved in mathematical thinking, including the distinction between subtraction and multiplication. Dehaene has also uncovered the neural activity at the core of conscious awareness and experience.