As neuroscientists refine their understanding of how the human brain works, the prefrontal cortex (PFC) has been shown to play a powerful role. As the brain's ""central executive,"" the PFC is responsible for handling all kinds of thought processes, from sorting through short-term memories to understanding jokes.Stein, the former neuroscience editor for Omni, uses interviews with a wide array of brain researchers as the foundation for her overview, explaining the significance of their research. While the ramifications of each line of study—establishing the PFC's role in everything from emotional intelligence to the suppression of violence—are significant, Stein has difficulty bringing them all together into a dynamic, involving story. And while she does provide a few pictures of the prefrontal and cerebral cortices at the beginning of the book, the lack of illustrations in the text makes it harder to understand the relationships among the areas of the brain she discusses. The science is solid, but the account lacks the welcoming quality of recent works by other brain specialists such as Steven Johnson and John Horgan. (Feb.) (Publishers Weekly, November 27, 2006)