Gazzaniga makes this interesting claim: Just as you cannot explain traffic patterns by studying car parts, neuroscience must abandon its tendency to reduce macro-level phenomena like free will to micro-level explanations. Along the way he provides fascinating and understandable information from brain evolution to studies involving infants and patients with severed brain hemispheres (split-brain patients). The final chapters of the book consider neuroscience as it implicates social responsibility, justice and how we treat criminal offense.